Ski Size Calculator by Weight & Skill – Find Your Perfect Ski Length
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f8f9fa;
color: #333;
line-height: 1.6;
margin: 0;
padding: 0;
}
.container {
max-width: 960px;
margin: 20px auto;
padding: 20px;
background-color: #fff;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
display: flex;
flex-direction: column;
align-items: center;
}
header {
width: 100%;
background-color: #004a99;
color: #fff;
padding: 20px 0;
text-align: center;
border-radius: 8px 8px 0 0;
margin-bottom: 20px;
}
header h1 {
margin: 0;
font-size: 2.2em;
font-weight: 600;
}
.calculator-section {
width: 100%;
max-width: 700px; /* Slightly narrower for calculator focus */
margin-bottom: 30px;
padding: 25px;
border: 1px solid #e0e0e0;
border-radius: 8px;
background-color: #fdfdfd;
}
.calculator-section h2 {
text-align: center;
color: #004a99;
margin-top: 0;
margin-bottom: 25px;
font-size: 1.8em;
}
.input-group {
margin-bottom: 20px;
width: 100%;
}
.input-group label {
display: block;
margin-bottom: 8px;
font-weight: 500;
color: #004a99;
}
.input-group input[type="number"],
.input-group select {
width: calc(100% – 22px); /* Account for padding and border */
padding: 12px 10px;
border: 1px solid #ccc;
border-radius: 5px;
font-size: 1em;
box-sizing: border-box;
transition: border-color 0.3s ease;
}
.input-group input[type="number"]:focus,
.input-group select:focus {
outline: none;
border-color: #007bff;
box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}
.input-group .helper-text {
font-size: 0.85em;
color: #6c757d;
margin-top: 5px;
display: block;
}
.error-message {
color: #dc3545;
font-size: 0.85em;
margin-top: 5px;
display: block;
min-height: 1.2em; /* Prevents layout shifts */
}
button {
background-color: #004a99;
color: white;
padding: 12px 25px;
border: none;
border-radius: 5px;
cursor: pointer;
font-size: 1em;
margin: 5px;
transition: background-color 0.3s ease, transform 0.2s ease;
font-weight: 500;
}
button:hover {
background-color: #003f80;
transform: translateY(-1px);
}
button.reset {
background-color: #6c757d;
}
button.reset:hover {
background-color: #5a6268;
}
button.copy {
background-color: #28a745;
}
button.copy:hover {
background-color: #218838;
}
#results {
margin-top: 30px;
padding: 25px;
border: 1px solid #d4edda;
border-radius: 8px;
background-color: #e9f7ec;
text-align: center;
width: 100%;
box-sizing: border-box;
}
#results h3 {
color: #004a99;
margin-top: 0;
font-size: 1.6em;
margin-bottom: 20px;
}
.main-result {
font-size: 2.5em;
font-weight: bold;
color: #004a99;
margin-bottom: 15px;
padding: 15px;
background-color: #ffffff;
border-radius: 5px;
display: inline-block; /* For background sizing */
border: 2px dashed #004a99;
}
.intermediate-results {
margin-top: 20px;
display: flex;
justify-content: space-around;
flex-wrap: wrap;
gap: 15px;
}
.intermediate-results div {
background-color: #fff;
padding: 15px;
border-radius: 6px;
box-shadow: 0 1px 5px rgba(0, 0, 0, 0.08);
text-align: center;
flex: 1; /* Distribute space */
min-width: 150px;
}
.intermediate-results span {
display: block;
font-size: 1.4em;
font-weight: bold;
color: #004a99;
}
.intermediate-results p {
margin: 5px 0 0 0;
font-size: 0.9em;
color: #555;
}
.formula-explanation {
margin-top: 25px;
font-size: 0.95em;
color: #555;
text-align: left;
border-top: 1px dashed #ccc;
padding-top: 15px;
}
table {
width: 100%;
border-collapse: collapse;
margin-top: 30px;
margin-bottom: 30px;
box-shadow: 0 1px 5px rgba(0,0,0,0.05);
}
th, td {
border: 1px solid #ddd;
padding: 12px 15px;
text-align: left;
}
th {
background-color: #004a99;
color: white;
font-weight: 600;
}
tbody tr:nth-child(even) {
background-color: #f8f9fa;
}
caption {
caption-side: bottom;
font-size: 0.9em;
color: #666;
margin-top: 10px;
text-align: center;
}
canvas {
display: block;
margin: 20px auto;
max-width: 100%;
border: 1px solid #ccc;
border-radius: 5px;
background-color: #fefefe;
}
.chart-container {
margin-top: 30px;
padding: 20px;
background-color: #fff;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}
.chart-container h3 {
text-align: center;
color: #004a99;
margin-top: 0;
margin-bottom: 15px;
}
.article-content {
margin-top: 40px;
padding: 30px;
background-color: #fff;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
.article-content h2, .article-content h3 {
color: #004a99;
margin-top: 1.5em;
margin-bottom: 0.8em;
}
.article-content h1 {
text-align: center;
color: #004a99;
margin-bottom: 1.2em;
}
.article-content p {
margin-bottom: 1em;
}
.article-content ul, .article-content ol {
margin-left: 20px;
margin-bottom: 1em;
}
.article-content li {
margin-bottom: 0.5em;
}
.article-content a {
color: #007bff;
text-decoration: none;
}
.article-content a:hover {
text-decoration: underline;
}
.faq-section .faq-item {
margin-bottom: 15px;
border-bottom: 1px dashed #eee;
padding-bottom: 10px;
}
.faq-section .faq-item:last-child {
border-bottom: none;
}
.faq-question {
font-weight: bold;
color: #004a99;
cursor: pointer;
display: flex;
justify-content: space-between;
align-items: center;
}
.faq-question::after {
content: '+';
font-size: 1.2em;
color: #004a99;
}
.faq-answer {
display: none;
margin-top: 10px;
padding-left: 15px;
font-size: 0.95em;
color: #555;
}
.faq-item.open .faq-question::after {
content: '-';
}
.faq-item.open .faq-answer {
display: block;
}
.related-links {
margin-top: 30px;
padding: 20px;
background-color: #eef;
border-radius: 8px;
border: 1px solid #d0d0f0;
}
.related-links ul {
list-style: none;
padding: 0;
margin: 0;
}
.related-links li {
margin-bottom: 10px;
}
.related-links a {
font-weight: bold;
}
.related-links p {
font-size: 0.9em;
color: #555;
margin-top: 5px;
}
Determine Your Ideal Ski Length
Your Recommended Ski Size
— cm
Formula Basis: Ski length is generally correlated with body weight and influenced by skill level and skiing style. Lighter skiers or beginners often prefer shorter skis for maneuverability, while heavier or more aggressive skiers may opt for longer skis for stability and power.
Ski Length vs. Weight & Style
Visualizing recommended ski lengths across different weight and style profiles.
Ski Size Calculator by Weight & Skill: Find Your Perfect Ski Length
Choosing the right ski length is crucial for an enjoyable and effective skiing experience. Too short, and your skis might lack stability at speed. Too long, and they can feel cumbersome and difficult to turn. This ski size calculator by weight and skill is designed to provide a strong starting point for selecting skis that match your physical attributes and skiing preferences.
{primary_keyword}
A ski size calculator by weight is an online tool that helps skiers estimate the appropriate length of their skis. It primarily uses your body weight as the main input, but often incorporates other critical factors like your skill level (beginner, intermediate, advanced, expert) and your preferred skiing style (e.g., all-mountain, freeride, carving, freestyle). The goal of this ski size calculator by weight is to take the guesswork out of ski selection, ensuring you get skis that offer optimal performance, control, and stability for your specific needs. This ski size calculator by weight is indispensable for skiers of all levels looking to purchase new equipment or simply understand how their current gear stacks up.
Who should use it? Anyone looking to buy new skis, especially those who are new to the sport, returning after a break, or have recently experienced a significant change in weight. It's also useful for experienced skiers who are exploring different types of skis and want to understand how weight and style influence length recommendations.
Common misconceptions: A common misconception is that ski length is solely determined by height. While height is a factor, weight often plays a more significant role in how a ski performs under pressure. Another misconception is that advanced skiers always need the longest skis; this isn't true, as the ideal length still depends on the specific ski type and intended use.
The core of a ski size calculator by weight relies on empirical data and general skiing principles. While exact proprietary formulas vary between manufacturers, a common approach involves establishing a base recommendation based on weight, and then applying adjustments for skill and style. Our ski size calculator by weight uses a simplified yet effective model.
Step-by-step derivation:
- Base Length Calculation: A baseline ski length is determined primarily by weight. This is often derived from charts or algorithms that map weight ranges to ski lengths. For example, a certain weight might correspond to a 'mid-range' ski length.
- Skill Level Adjustment: Beginners or lighter skiers typically benefit from shorter skis for easier turning and maneuverability. Advanced or heavier skiers might need longer skis for stability at speed and edge hold. This adds or subtracts centimeters from the base length.
- Skiing Style Adjustment: Different skiing styles also influence length. Aggressive carving on groomers might favor a slightly longer ski than expected for stability, while powder skiing might benefit from a longer ski for flotation. Freestyle skiers often prefer shorter skis for easier rotations and tricks. These factors further refine the length.
- Final Recommendation: The adjusted length provides the final recommended ski size.
Variable Explanations:
| Variable |
Meaning |
Unit |
Typical Range |
| Skier Weight |
The body weight of the skier. |
Kilograms (kg) |
30 – 150+ kg |
| Skill Level |
The skier's proficiency on snow. |
Categorical (Beginner, Intermediate, Advanced, Expert) |
N/A |
| Skiing Style |
The type of terrain and skiing method. |
Categorical (All-Mountain, Freeride, Carving, Freestyle) |
N/A |
| Base Recommendation |
Initial ski length estimate based purely on weight. |
Centimeters (cm) |
140 – 190+ cm |
| Style/Skill Adjustment |
Centimeters added or subtracted based on skill and style. |
Centimeters (cm) |
-10 to +10 cm |
| Recommended Ski Length |
The final calculated optimal ski length. |
Centimeters (cm) |
145 – 195+ cm |
Key variables used in ski length calculation.
Practical Examples (Real-World Use Cases)
Let's see how the ski size calculator by weight works in practice:
Example 1: The Intermediate All-Mountain Skier
- Inputs: Skier Weight: 80 kg, Skill Level: Intermediate, Skiing Style: All-Mountain
- Calculator Output:
- Base Recommendation: 170 cm
- Style/Skill Adjustment: +5 cm (Intermediate/All-Mountain lean towards slightly longer for versatility)
- Recommended Ski Length: 175 cm
- Interpretation: For an 80kg intermediate skier who enjoys a mix of groomed slopes and off-piste exploration, a 175 cm ski offers a good balance of stability for firmer snow and maneuverability for variable conditions.
Example 2: The Lightweight Freeride Enthusiast
- Inputs: Skier Weight: 60 kg, Skill Level: Advanced, Skiing Style: Freeride/Powder
- Calculator Output:
- Base Recommendation: 165 cm
- Style/Skill Adjustment: +10 cm (Advanced/Freeride needs length for flotation and stability in powder)
- Recommended Ski Length: 175 cm
- Interpretation: Despite being lighter, the advanced skier's preference for freeride means they benefit from a longer ski (175 cm) to provide sufficient surface area for buoyancy in powder and stability when tackling steep, ungroomed terrain. The calculator correctly prioritizes style and skill over just weight for this use case.
How to Use This Ski Size Calculator Weight
Using our ski size calculator by weight is straightforward. Follow these simple steps:
- Enter Your Weight: Accurately input your body weight in kilograms (kg) into the designated field. This is the most critical input.
- Select Skill Level: Choose the option that best describes your skiing ability: Beginner, Intermediate, Advanced, or Expert.
- Choose Skiing Style: Select the type of skiing you do most often: All-Mountain, Freeride/Powder, Carving/Groomers, or Freestyle/Park.
- Click Calculate: Press the "Calculate Ski Size" button.
How to read results: The calculator will display your "Recommended Ski Length" prominently. It also shows the "Base Recommendation" derived from your weight and the "Style/Skill Adjustment" that was applied. This breakdown helps you understand the factors influencing the final suggestion.
Decision-making guidance: The recommended length is an excellent starting point. Consider trying skis within a 5cm range above or below the recommendation, especially if you're between sizes. Your personal feel and preference are paramount. For instance, if you're on the fence and like quick turns, lean shorter. If you prioritize stability at high speeds, lean longer.
Key Factors That Affect Ski Results
While weight, skill, and style are primary, several other elements influence the ideal ski length:
- Ski Dimensions (Waist Width & Rocker Profile): Wider skis (higher waist width), common in freeride, offer more flotation and often perform better at longer lengths than narrow carving skis. Rocker (tip and tail rise) can make longer skis feel easier to turn.
- Ski Stiffness: Stiffer skis generally require a longer length for a given skier to allow them to flex properly and engage their full edge. Softer skis can often be ridden shorter.
- Personal Preference: Some skiers simply prefer quicker, more nimble skis (shorter) or more stable, powerful skis (longer), regardless of standard recommendations.
- Terrain Specialization: A skier who primarily carves on groomers might prefer a different length than the same weight/skill skier who spends most of their time in deep powder.
- Binding Placement: While less about length selection, how bindings are mounted affects turn initiation and ski feel, indirectly influencing perceived ideal length.
- Height: Although weight is prioritized, a very tall skier might lean towards longer skis than a shorter skier of the exact same weight, as height influences leverage and reach.
- Aggressiveness of Skiing: A heavier-handed or more aggressive skier may benefit from a longer, stiffer ski for better control and to prevent overpowering the ski.
Frequently Asked Questions (FAQ)
Does my height matter for ski length?
Height is a secondary factor. While taller skiers might intuitively choose longer skis, weight is a more direct determinant of how much pressure you can apply to the ski's edge and how it flexes. Our ski size calculator by weight prioritizes weight but considers height implicitly through typical weight distributions.
Should I size down if I'm a beginner?
Yes, beginners generally benefit from shorter skis. They are easier to turn, control, and maneuver, which helps build confidence and proper technique faster. Our calculator reflects this by recommending shorter lengths for beginners.
How does weight affect ski length choice?
Heavier skiers can flex skis more effectively and require longer lengths for stability and performance, especially at speed. Lighter skiers can easily overpower longer skis, so they often do better on shorter ones for easier turn initiation.
What if I ski in very different conditions?
If you ski a wide variety of conditions, an "All-Mountain" category is usually the best choice, and the calculator provides a balanced recommendation. If you have distinct preferences (e.g., mostly powder days vs. mostly groomer days), consider a ski tailored to that discipline, which might necessitate a slightly different length.
Can I use this ski size calculator weight for kids' skis?
This calculator is primarily designed for adult skiers. Children's ski sizing often follows slightly different guidelines, focusing more on their height and ability relative to their size, though weight remains a factor.
What does "adjusting for style" mean?
Different styles demand different ski behaviors. Freeride/powder skis need length for floatation. Carving skis benefit from length for edge hold and stability. Freestyle skis are often shorter for agility in the park and for spins. The calculator applies these nuances.
What if I'm exactly between two sizes?
If you're on the border, consider your priorities. For quicker turns and easier maneuverability, lean towards the shorter end. For more stability at speed and on firmer snow, lean towards the longer end. Your current skill level also plays a role.
Is this calculator a substitute for professional advice?
While this ski size calculator by weight provides an excellent starting point, it's always recommended to consult with experienced ski shop professionals. They can offer personalized advice based on your specific needs, local conditions, and the nuances of different ski models.
function validateInput(id, errorId, minValue, maxValue) {
var input = document.getElementById(id);
var errorSpan = document.getElementById(errorId);
var value = parseFloat(input.value);
var isValid = true;
if (isNaN(value) || input.value.trim() === "") {
errorSpan.textContent = "This field is required.";
isValid = false;
} else if (value maxValue) {
errorSpan.textContent = "Value exceeds maximum limit.";
isValid = false;
} else {
errorSpan.textContent = "";
}
return isValid;
}
function calculateSkiSize() {
var weight = parseFloat(document.getElementById("skierWeight").value);
var skill = document.getElementById("skillLevel").value;
var style = document.getElementById("skiingStyle").value;
var weightErrorSpan = document.getElementById("weightError");
var isValidWeight = validateInput("skierWeight", "weightError", 0, 200); // Max 200kg for sanity
if (!isValidWeight) {
document.getElementById("recommendedLength").textContent = "– cm";
document.getElementById("baseLength").textContent = "– cm";
document.getElementById("lengthAdjustment").textContent = "– cm";
document.getElementById("weightFactor").textContent = "–";
return;
}
var baseLength;
var weightFactor;
// Base length calculation based on weight – simplified linear interpolation
if (weight < 50) {
baseLength = 155; weightFactor = 3.1; // Skis per kg
} else if (weight < 60) {
baseLength = 160; weightFactor = 3.0;
} else if (weight < 70) {
baseLength = 165; weightFactor = 2.9;
} else if (weight < 80) {
baseLength = 170; weightFactor = 2.8;
} else if (weight < 90) {
baseLength = 175; weightFactor = 2.7;
} else if (weight < 100) {
baseLength = 180; weightFactor = 2.6;
} else {
baseLength = 185; weightFactor = 2.5;
}
// Refine base length slightly – closer to 170 for average
baseLength = Math.round((weight * weightFactor) + 20); // Adjusted for typical ranges
var adjustment = 0;
// Skill Level Adjustment
if (skill === "beginner") {
adjustment -= 5;
} else if (skill === "intermediate") {
adjustment += 0; // Neutral
} else if (skill === "advanced") {
adjustment += 5;
} else if (skill === "expert") {
adjustment += 8;
}
// Skiing Style Adjustment
if (style === "allMountain") {
adjustment += 3;
} else if (style === "freeride") {
adjustment += 7; // Longer for flotation
} else if (style === "carving") {
adjustment += 5; // Longer for stability and edge hold
} else if (style === "freestyle") {
adjustment -= 5; // Shorter for agility
}
// Combine and ensure reasonable bounds
var recommendedLength = baseLength + adjustment;
// Apply some general bounds to prevent extreme values
if (recommendedLength 195) recommendedLength = 195;
// Ensure the adjustment reflects the change from base
var effectiveAdjustment = recommendedLength – baseLength;
document.getElementById("recommendedLength").textContent = Math.round(recommendedLength) + " cm";
document.getElementById("baseLength").textContent = Math.round(baseLength) + " cm";
document.getElementById("lengthAdjustment").textContent = (effectiveAdjustment >= 0 ? "+" : "") + Math.round(effectiveAdjustment) + " cm";
document.getElementById("weightFactor").textContent = weightFactor.toFixed(1);
updateChart(weight, skill, style, recommendedLength);
}
function resetForm() {
document.getElementById("skierWeight").value = "75";
document.getElementById("skillLevel").value = "intermediate";
document.getElementById("skiingStyle").value = "allMountain";
document.getElementById("weightError").textContent = "";
calculateSkiSize();
}
function copyResults() {
var recommended = document.getElementById("recommendedLength").textContent;
var base = document.getElementById("baseLength").textContent;
var adjustment = document.getElementById("lengthAdjustment").textContent;
var weightFactor = document.getElementById("weightFactor").textContent;
var weight = document.getElementById("skierWeight").value;
var skill = document.getElementById("skillLevel").options[document.getElementById("skillLevel").selectedIndex].text;
var style = document.getElementById("skiingStyle").options[document.getElementById("skiingStyle").selectedIndex].text;
var assumptions = "Inputs:\n" +
"- Weight: " + weight + " kg\n" +
"- Skill Level: " + skill + "\n" +
"- Skiing Style: " + style + "\n\n" +
"Key Factors:\n" +
"- Weight Influence Factor: " + weightFactor + "\n\n" +
"Calculation:\n" +
"- Base Recommendation: " + base + "\n" +
"- Style/Skill Adjustment: " + adjustment + "\n\n";
var textToCopy = "Recommended Ski Length: " + recommended + "\n\n" + assumptions;
// Use navigator.clipboard for modern browsers, fallback for older ones
if (navigator.clipboard && navigator.clipboard.writeText) {
navigator.clipboard.writeText(textToCopy).then(function() {
alert('Results copied to clipboard!');
}).catch(function(err) {
console.error('Could not copy text: ', err);
fallbackCopyTextToClipboard(textToCopy);
});
} else {
fallbackCopyTextToClipboard(textToCopy);
}
}
function fallbackCopyTextToClipboard(text) {
var textArea = document.createElement("textarea");
textArea.value = text;
textArea.style.position="fixed";
textArea.style.top = "0";
textArea.style.left = "0";
textArea.style.width = "2em";
textArea.style.height = "2em";
textArea.style.padding = "0";
textArea.style.border="none";
textArea.style.outline="none";
textArea.style.boxShadow="none";
textArea.style.background="transparent";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
alert('Fallback: Copying text command was ' + msg);
} catch (err) {
console.error('Fallback: Unable to copy text.', err);
}
document.body.removeChild(textArea);
}
function updateChart(currentWeight, currentSkill, currentStyle, recommendedLength) {
var canvas = document.getElementById("skiLengthChart");
var ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear previous chart
// Define data points for different styles/skills at similar weights
var dataPoints = [
{ weight: 50, style: "freestyle", skill: "beginner", length: calculateSingle(50, "beginner", "freestyle") },
{ weight: 50, style: "carving", skill: "intermediate", length: calculateSingle(50, "intermediate", "carving") },
{ weight: 50, style: "allMountain", skill: "advanced", length: calculateSingle(50, "advanced", "allMountain") },
{ weight: 50, style: "freeride", skill: "expert", length: calculateSingle(50, "expert", "freeride") },
{ weight: 80, style: "freestyle", skill: "beginner", length: calculateSingle(80, "beginner", "freestyle") },
{ weight: 80, style: "carving", skill: "intermediate", length: calculateSingle(80, "intermediate", "carving") },
{ weight: 80, style: "allMountain", skill: "advanced", length: calculateSingle(80, "advanced", "allMountain") },
{ weight: 80, style: "freeride", skill: "expert", length: calculateSingle(80, "expert", "freeride") },
{ weight: 110, style: "freestyle", skill: "beginner", length: calculateSingle(110, "beginner", "freestyle") },
{ weight: 110, style: "carving", skill: "intermediate", length: calculateSingle(110, "intermediate", "carving") },
{ weight: 110, style: "allMountain", skill: "advanced", length: calculateSingle(110, "advanced", "allMountain") },
{ weight: 110, style: "freeride", skill: "expert", length: calculateSingle(110, "expert", "freeride") }
];
// Prepare data series for chart
var weights = [50, 80, 110];
var styles = ["Freestyle", "Carving", "All-Mountain", "Freeride"];
var seriesData = {};
styles.forEach(function(styleName) {
seriesData[styleName] = [];
weights.forEach(function(w) {
var skill = "intermediate"; // Defaulting skill for chart illustration
if (styleName === "Freestyle") skill = "beginner";
else if (styleName === "Freeride") skill = "expert";
else if (styleName === "Carving") skill = "intermediate";
else skill = "advanced"; // All-Mountain
seriesData[styleName].push({
x: w,
y: calculateSingle(w, skill, styleName.toLowerCase())
});
});
});
// Charting logic (simple bar or line chart)
var chartWidth = canvas.width;
var chartHeight = canvas.height;
var padding = 40;
var chartAreaWidth = chartWidth – 2 * padding;
var chartAreaHeight = chartHeight – 2 * padding;
// Find max y value for scaling
var maxY = 0;
for (var style in seriesData) {
seriesData[style].forEach(function(point) {
if (point.y > maxY) maxY = point.y;
});
}
maxY = Math.ceil(maxY / 10) * 10; // Round up to nearest 10
// Draw axes
ctx.strokeStyle = '#ccc';
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(padding, padding);
ctx.lineTo(padding, chartHeight – padding); // Y-axis
ctx.lineTo(chartWidth – padding, chartHeight – padding); // X-axis
ctx.stroke();
// Draw X-axis labels (Weights)
ctx.fillStyle = '#333';
ctx.textAlign = 'center';
weights.forEach(function(w, index) {
var xPos = padding + (index + 0.5) * (chartAreaWidth / weights.length);
ctx.fillText(w + ' kg', xPos, chartHeight – padding + 15);
});
// Draw Y-axis labels (Lengths)
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
var yScale = chartAreaHeight / maxY;
for (var i = 0; i <= maxY; i += 20) { // Tick every 20cm
var yPos = chartHeight – padding – i * yScale;
ctx.fillText(i + ' cm', padding – 10, yPos);
ctx.beginPath();
ctx.moveTo(padding – 5, yPos);
ctx.lineTo(padding, yPos);
ctx.stroke();
}
// Draw data series
var colors = ['#004a99', '#28a745', '#ffc107', '#17a2b8'];
var colorIndex = 0;
for (var style in seriesData) {
ctx.strokeStyle = colors[colorIndex % colors.length];
ctx.fillStyle = colors[colorIndex % colors.length];
ctx.lineWidth = 2;
ctx.beginPath();
seriesData[style].forEach(function(point, index) {
var xPos = padding + (index + 0.5) * (chartAreaWidth / weights.length);
var yPos = chartHeight – padding – point.y * yScale;
if (index === 0) {
ctx.moveTo(xPos, yPos);
} else {
ctx.lineTo(xPos, yPos);
}
// Draw point marker
ctx.beginPath();
ctx.arc(xPos, yPos, 4, 0, Math.PI * 2);
ctx.fill();
});
ctx.stroke();
colorIndex++;
}
// Draw Legend
ctx.textAlign = 'left';
ctx.textBaseline = 'top';
var legendX = padding;
var legendY = padding – 25; // Position above graph area
colorIndex = 0;
styles.forEach(function(style) {
ctx.fillStyle = colors[colorIndex % colors.length];
ctx.fillRect(legendX, legendY, 15, 5); // Color swatch
ctx.fillStyle = '#333';
ctx.fillText(style, legendX + 20, legendY);
legendY += 20; // Move down for next item
colorIndex++;
});
}
// Helper function to calculate single point for chart
function calculateSingle(weight, skill, style) {
var baseLength;
var weightFactor;
if (weight < 50) { baseLength = 155; weightFactor = 3.1; }
else if (weight < 60) { baseLength = 160; weightFactor = 3.0; }
else if (weight < 70) { baseLength = 165; weightFactor = 2.9; }
else if (weight < 80) { baseLength = 170; weightFactor = 2.8; }
else if (weight < 90) { baseLength = 175; weightFactor = 2.7; }
else if (weight < 100) { baseLength = 180; weightFactor = 2.6; }
else { baseLength = 185; weightFactor = 2.5; }
baseLength = Math.round((weight * weightFactor) + 20);
var adjustment = 0;
if (skill === "beginner") adjustment -= 5;
else if (skill === "intermediate") adjustment += 0;
else if (skill === "advanced") adjustment += 5;
else if (skill === "expert") adjustment += 8;
if (style === "allmountain") adjustment += 3;
else if (style === "freeride") adjustment += 7;
else if (style === "carving") adjustment += 5;
else if (style === "freestyle") adjustment -= 5;
var recommendedLength = baseLength + adjustment;
if (recommendedLength 195) recommendedLength = 195;
return recommendedLength;
}
// FAQ Toggle
document.addEventListener('DOMContentLoaded', function() {
var faqItems = document.querySelectorAll('.faq-item');
faqItems.forEach(function(item) {
var question = item.querySelector('.faq-question');
question.addEventListener('click', function() {
item.classList.toggle('open');
});
});
// Initial calculation on load
calculateSkiSize();
});