Weight Lift Max Calculator: Estimate Your 1 Rep Max (1RM)
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, 74, 153, 0.1);
}
header {
background-color: #004a99;
color: #fff;
padding: 20px;
text-align: center;
border-radius: 8px 8px 0 0;
}
h1 {
margin: 0;
font-size: 2.2em;
color: #fff;
}
.calculator-section {
padding: 30px 20px;
border-bottom: 1px solid #eee;
}
.calculator-section:last-child {
border-bottom: none;
}
.loan-calc-container {
display: flex;
flex-direction: column;
gap: 20px;
}
.input-group {
display: flex;
flex-direction: column;
gap: 5px;
}
.input-group label {
font-weight: bold;
color: #004a99;
}
.input-group input[type="number"],
.input-group select {
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1em;
width: 100%;
box-sizing: border-box;
}
.input-group input[type="number"]:focus,
.input-group select:focus {
border-color: #004a99;
outline: none;
box-shadow: 0 0 5px rgba(0, 74, 153, 0.3);
}
.helper-text {
font-size: 0.85em;
color: #666;
}
.error-message {
color: #dc3545;
font-size: 0.8em;
margin-top: 5px;
display: none; /* Hidden by default */
}
.error-message.visible {
display: block;
}
button {
padding: 12px 20px;
background-color: #004a99;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 1em;
transition: background-color 0.3s ease;
margin-top: 10px;
}
button:hover {
background-color: #003366;
}
button.secondary {
background-color: #6c757d;
margin-left: 10px;
}
button.secondary:hover {
background-color: #5a6268;
}
#result {
background-color: #28a745;
color: white;
padding: 20px;
text-align: center;
border-radius: 8px;
margin-top: 30px;
box-shadow: 0 4px 15px rgba(40, 167, 69, 0.4);
}
#result h2 {
margin-top: 0;
font-size: 1.8em;
color: #fff;
}
.result-value {
font-size: 2.5em;
font-weight: bold;
display: block;
margin-bottom: 10px;
}
.intermediate-results, .formula-explanation {
margin-top: 25px;
padding: 15px;
background-color: #e9ecef;
border-radius: 4px;
}
.intermediate-results h3, .formula-explanation h3 {
margin-top: 0;
color: #004a99;
}
.intermediate-results ul {
list-style: none;
padding: 0;
margin: 0;
}
.intermediate-results li {
display: flex;
justify-content: space-between;
padding: 8px 0;
border-bottom: 1px dashed #ccc;
}
.intermediate-results li:last-child {
border-bottom: none;
}
canvas {
display: block;
margin: 30px auto;
border: 1px solid #ddd;
border-radius: 4px;
}
table {
width: 100%;
border-collapse: collapse;
margin-top: 30px;
}
th, td {
padding: 10px;
text-align: left;
border: 1px solid #ddd;
}
thead {
background-color: #004a99;
color: white;
}
tbody tr:nth-child(even) {
background-color: #f2f2f2;
}
caption {
font-size: 1.1em;
font-weight: bold;
margin-bottom: 10px;
color: #333;
}
.article-content {
margin-top: 40px;
padding: 30px 20px;
background-color: #fff;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 74, 153, 0.1);
}
.article-content h2 {
color: #004a99;
margin-top: 30px;
border-bottom: 2px solid #004a99;
padding-bottom: 5px;
}
.article-content h3 {
color: #0056b3;
margin-top: 20px;
}
.article-content p {
margin-bottom: 15px;
}
.article-content ul,
.article-content ol {
margin-left: 20px;
margin-bottom: 15px;
}
.article-content li {
margin-bottom: 8px;
}
.article-content a {
color: #007bff;
text-decoration: none;
}
.article-content a:hover {
text-decoration: underline;
}
.faq-item {
margin-bottom: 15px;
padding: 10px;
background-color: #f8f9fa;
border-left: 4px solid #004a99;
}
.faq-item strong {
color: #004a99;
}
.related-links ul {
list-style: none;
padding: 0;
}
.related-links li {
margin-bottom: 10px;
}
.related-links a {
font-weight: bold;
}
.highlighted-result {
font-size: 3em;
font-weight: bold;
color: #fff;
background-color: #28a745;
padding: 15px 25px;
border-radius: 5px;
display: inline-block;
margin-bottom: 20px;
box-shadow: 0 4px 10px rgba(40, 167, 69, 0.5);
}
.calc-buttons {
display: flex;
justify-content: center;
gap: 10px;
margin-top: 25px;
}
.chart-container {
position: relative;
width: 100%;
max-width: 700px; /* Limit chart width */
margin: 30px auto;
padding: 20px;
background-color: #fff;
border: 1px solid #ddd;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 74, 153, 0.05);
}
.chart-container h3 {
text-align: center;
margin-top: 0;
color: #004a99;
}
#liftChart {
width: 100%;
height: auto;
}
Estimated 1 Rep Max (1RM)
—
kg / lbs
Estimated Max Strength Progression
Strength Progression Estimates
| Reps |
Estimated Max Weight (kg/lbs) |
Formula Used |
What is a Weight Lift Max Calculator?
A weight lift max calculator is a powerful tool designed to help individuals estimate their maximum strength for a single repetition (known as a One Rep Max or 1RM) in various weightlifting exercises. This calculator takes into account the weight you've lifted and the number of repetitions you performed to predict how much you could theoretically lift for just one, maximal effort repetition. Understanding your estimated 1RM is crucial for effective strength training, program design, and monitoring progress.
Who Should Use a Weight Lift Max Calculator?
This weight lift max calculator is beneficial for a wide range of individuals involved in strength training:
- Powerlifters and Olympic Lifters: Essential for setting training goals, developing periodization plans, and tracking strength gains.
- Bodybuilders: Useful for understanding their absolute strength ceiling, which can inform rep ranges and training intensity.
- General Fitness Enthusiasts: Anyone looking to gauge their strength progression, set personal records, or ensure their training is challenging enough.
- Coaches and Trainers: A practical tool for assessing athletes' strength levels and programming appropriately.
Common Misconceptions about 1RM
Several myths surround the concept of 1RM. Firstly, it's often assumed that testing 1RM directly is always necessary. However, direct testing can be risky for untrained individuals and requires careful warm-ups and spotters. Calculators provide a safe and effective alternative for estimation. Another misconception is that a higher 1RM directly translates to better muscle hypertrophy (growth). While related, training for maximal strength often involves different rep ranges and protocols than training specifically for hypertrophy.
The core of any weight lift max calculator lies in its underlying formula. Several formulas exist, each with slightly different mathematical approaches and empirical validation. The most common ones are derived from studies observing the relationship between weight lifted and the number of reps completed to failure. The general principle is that as the weight increases, the number of reps possible decreases following a predictable curve.
Common Formulas Used:
- Epley Formula: 1RM = Weight * (1 + (Reps / 30))
- Brzycki Formula: 1RM = Weight / (1.0278 – (0.0278 * Reps))
- McDavid Formula: 1RM = (Weight * Reps * 0.0333) + Weight
- O'Conner Formula: 1RM = Weight * (1 + (Reps / 3))
Variable Explanations:
In these formulas:
- Weight: The actual weight (in kg or lbs) successfully lifted for the given repetitions.
- Reps: The number of repetitions performed with the specified weight.
Variables Table:
Weight Lift Max Calculator Variables
| Variable |
Meaning |
Unit |
Typical Range |
| Weight |
Mass lifted |
kg or lbs |
1 – 1000+ |
| Reps |
Repetitions performed |
Count |
1 – 20+ (most accurate for 3-10 reps) |
| 1RM |
Estimated One Rep Max |
kg or lbs |
Weight lifted * ~1.03 to Weight lifted * ~3+ |
The accuracy of these formulas tends to be highest when the number of repetitions performed is between 3 and 10. Estimations for very low reps (1-2) or very high reps (15+) become less reliable.
Practical Examples (Real-World Use Cases)
Let's explore how the weight lift max calculator works with practical scenarios.
Example 1: Bench Press Progress
Sarah is training her bench press. She successfully completes 5 repetitions with a weight of 80 kg. She wants to estimate her 1RM using the Epley formula.
- Weight = 80 kg
- Reps = 5
- Formula: Epley (1RM = Weight * (1 + (Reps / 30)))
Calculation: 1RM = 80 * (1 + (5 / 30)) = 80 * (1 + 0.1667) = 80 * 1.1667 = 93.34 kg.
Result Interpretation: Sarah's estimated 1RM on the bench press is approximately 93.3 kg. This information helps her set her next training cycle's target weights, perhaps aiming to break 95 kg in the coming weeks.
Example 2: Squat Strength Assessment
John is working on his squat. He managed to perform 3 reps with 150 kg. He decides to use the Brzycki formula to see his estimated max.
- Weight = 150 kg
- Reps = 3
- Formula: Brzycki (1RM = Weight / (1.0278 – (0.0278 * Reps)))
Calculation: 1RM = 150 / (1.0278 – (0.0278 * 3)) = 150 / (1.0278 – 0.0834) = 150 / 0.9444 = 158.83 kg.
Result Interpretation: John's estimated 1RM for squats is around 159 kg. This is valuable data for his strength program, especially if he competes or has specific strength targets.
How to Use This Weight Lift Max Calculator
Using our weight lift max calculator is straightforward. Follow these simple steps:
- Enter the Weight: Input the heaviest weight you successfully lifted for a specific number of repetitions. Ensure you use consistent units (kg or lbs).
- Enter the Reps: Specify the exact number of repetitions you performed with the entered weight.
- Select a Formula: Choose the formula you prefer or the one recommended by your coach. The Epley formula is often a good starting point due to its widespread use and reasonable accuracy.
- View Results: The calculator will instantly display your estimated 1RM. It will also show intermediate values and the specific formula used for clarity.
- Interpret the Data: Use the 1RM estimate to guide your training. For example, you might set your working weights for hypertrophy (e.g., 60-80% of 1RM) or strength (e.g., 80-95% of 1RM).
- Analyze Progression: The table and chart provide a visual representation of how your estimated max strength might evolve based on the data entered.
The "Copy Results" button allows you to easily share your findings or save them for your records. The "Reset" button helps you quickly start a new calculation.
Key Factors That Affect Weight Lift Max Results
While the formulas provide a mathematical estimate, several real-world factors influence your actual lifting capacity and the accuracy of the calculated 1RM:
- Training Experience: Beginners tend to have less predictable strength curves than experienced lifters.
- Exercise Technique: Proper form is crucial. Inconsistent technique can inflate or deflate perceived strength.
- Fatigue Levels: Performing a 1RM estimate when fatigued will yield lower, less accurate results.
- Muscle Fiber Type Dominance: Individuals with a higher proportion of fast-twitch muscle fibers may respond differently to strength training.
- Nutrition and Recovery: Adequate protein intake, sleep, and overall recovery significantly impact strength potential.
- Warm-up Protocol: An insufficient or excessive warm-up can negatively affect performance.
- Mental State: Motivation and focus play a role in maximal effort lifts.
- Specificity of Training: If you haven't trained a specific lift recently, your estimated 1RM might be lower than your true potential for that movement.
Remember, the calculated 1RM is an estimate. For precise measurements, supervised testing might be necessary, but always prioritize safety.
Frequently Asked Questions (FAQ)
Q1: What is the most accurate formula for calculating 1RM?
A1: There isn't one single "most accurate" formula for everyone. The Epley and Brzycki formulas are widely considered reliable, especially for reps between 3-10. Accuracy can vary based on individual physiology and training status. It's often best to try a couple and see which aligns best with your direct testing results.
Q2: Can I use the calculator for any exercise?
A2: Yes, this weight lift max calculator can be used for any resistance exercise where you can track weight lifted and repetitions performed (e.g., squats, deadlifts, bench press, overhead press, rows).
Q3: What if I only performed 1 or 2 reps?
A3: While the calculator can process these inputs, the accuracy of the 1RM estimate decreases significantly for very low rep ranges. Formulas are generally more reliable for rep ranges of 3-10.
Q4: Should I always aim to test my true 1RM?
A4: Not necessarily. Direct 1RM testing can be taxing on the nervous system and increase injury risk. Using a weight lift max calculator is a safer way to estimate your maximum strength for programming purposes.
Q5: How often should I update my estimated 1RM?
A5: This depends on your training goals and experience level. Beginners might see rapid progress and update monthly, while advanced lifters might update quarterly or less frequently. Listen to your body and track your progress.
Q6: What units should I use?
A6: The calculator will work with either kilograms (kg) or pounds (lbs), but be consistent. Ensure the unit you enter for "Weight Lifted" is the unit the result will be displayed in.
Q7: Can this calculator predict future strength gains?
A7: No, it estimates your *current* maximum strength based on recent performance. Future gains depend on your training program, nutrition, recovery, and consistency.
Q8: What does the chart show?
A8: The chart visualizes your estimated strength progression across different hypothetical repetition counts for a given weight, or how your 1RM might change if you performed the same weight for varying reps. It helps in understanding the relationship between weight, reps, and max strength.
var selectedUnit = 'kg'; // Default unit
function validateInput(value, id, min = 1, max = Infinity) {
var errorElement = document.getElementById(id + 'Error');
var isValid = true;
errorElement.innerText = ";
errorElement.classList.remove('visible');
if (value === null || value === " || isNaN(value)) {
errorElement.innerText = 'Please enter a valid number.';
isValid = false;
} else if (parseFloat(value) max) {
errorElement.innerText = 'Value cannot exceed ' + max + '.';
isValid = false;
}
return isValid;
}
function calculateMax() {
var weightInput = document.getElementById('weight');
var repsInput = document.getElementById('reps');
var formulaSelect = document.getElementById('formula');
var weightVal = weightInput.value.trim();
var repsVal = repsInput.value.trim();
var formulaType = formulaSelect.value;
var weightError = document.getElementById('weightError');
var repsError = document.getElementById('repsError');
var formulaError = document.getElementById('formulaError');
var weightValid = validateInput(weightVal, 'weight', 1, 9999);
var repsValid = validateInput(repsVal, 'reps', 1, 50); // Reasonable max reps
if (!weightValid || !repsValid) {
document.getElementById('maxResult').innerText = '–';
document.getElementById('resultWeightUnit').innerText = 'kg / lbs';
document.getElementById('intermediateValue1').innerText = ";
document.getElementById('intermediateValue2').innerText = ";
document.getElementById('intermediateValue3').innerText = ";
document.getElementById('formulaUsed').innerText = '–';
clearChartAndTable();
return;
}
var weight = parseFloat(weightVal);
var reps = parseInt(repsVal);
var maxResult = 0;
var formulaName = ";
var intermediate1 = ";
var intermediate2 = ";
var intermediate3 = ";
if (formulaType === 'epley') {
maxResult = weight * (1 + (reps / 30));
formulaName = 'Epley Formula: 1RM = Weight * (1 + (Reps / 30))';
intermediate1 = 'Rep Max Factor: ' + (1 + (reps / 30)).toFixed(4);
intermediate2 = 'Estimated 5RM: ' + (weight * (1 + (5 / 30))).toFixed(2) + ' ' + selectedUnit;
intermediate3 = 'Estimated 10RM: ' + (weight * (1 + (10 / 30))).toFixed(2) + ' ' + selectedUnit;
} else if (formulaType === 'brzycki') {
maxResult = weight / (1.0278 – (0.0278 * reps));
formulaName = 'Brzycki Formula: 1RM = Weight / (1.0278 – (0.0278 * Reps))';
intermediate1 = 'Rep Max Factor: ' + (1.0278 – (0.0278 * reps)).toFixed(4);
intermediate2 = 'Estimated 5RM: ' + (weight / (1.0278 – (0.0278 * 5))).toFixed(2) + ' ' + selectedUnit;
intermediate3 = 'Estimated 10RM: ' + (weight / (1.0278 – (0.0278 * 10))).toFixed(2) + ' ' + selectedUnit;
} else if (formulaType === 'mcdavid') {
maxResult = (weight * reps * 0.0333) + weight;
formulaName = 'McDavid Formula: 1RM = (Weight * Reps * 0.0333) + Weight';
intermediate1 = 'Rep Max Factor: ' + (1 + (reps * 0.0333)).toFixed(4);
intermediate2 = 'Estimated 5RM: ' + ((weight * 5 * 0.0333) + weight).toFixed(2) + ' ' + selectedUnit;
intermediate3 = 'Estimated 10RM: ' + ((weight * 10 * 0.0333) + weight).toFixed(2) + ' ' + selectedUnit;
} else if (formulaType === 'oconner') {
maxResult = weight * (1 + (reps / 3));
formulaName = 'O\'Conner Formula: 1RM = Weight * (1 + (Reps / 3))';
intermediate1 = 'Rep Max Factor: ' + (1 + (reps / 3)).toFixed(4);
intermediate2 = 'Estimated 5RM: ' + (weight * (1 + (5 / 3))).toFixed(2) + ' ' + selectedUnit;
intermediate3 = 'Estimated 10RM: ' + (weight * (1 + (10 / 3))).toFixed(2) + ' ' + selectedUnit;
}
maxResult = parseFloat(maxResult.toFixed(2)); // Round to 2 decimal places
document.getElementById('maxResult').innerText = maxResult.toLocaleString();
document.getElementById('resultWeightUnit').innerText = selectedUnit.toUpperCase();
document.getElementById('intermediateValue1').innerText = intermediate1;
document.getElementById('intermediateValue2').innerText = intermediate2;
document.getElementById('intermediateValue3').innerText = intermediate3;
document.getElementById('formulaUsed').innerText = formulaName;
updateChartAndTable(maxResult, weight, reps, formulaType);
}
function resetCalculator() {
document.getElementById('weight').value = '100'; // Sensible default
document.getElementById('reps').value = '5'; // Sensible default
document.getElementById('formula').value = 'epley'; // Default formula
selectedUnit = 'kg'; // Reset unit if needed
document.getElementById('resultWeightUnit').innerText = selectedUnit.toUpperCase();
// Clear errors
document.getElementById('weightError').innerText = ";
document.getElementById('weightError').classList.remove('visible');
document.getElementById('repsError').innerText = ";
document.getElementById('repsError').classList.remove('visible');
document.getElementById('formulaError').innerText = ";
document.getElementById('formulaError').classList.remove('visible');
calculateMax(); // Recalculate with defaults
}
function copyResults() {
var maxResult = document.getElementById('maxResult').innerText;
var unit = document.getElementById('resultWeightUnit').innerText;
var formula = document.getElementById('formulaUsed').innerText;
var int1 = document.getElementById('intermediateValue1').innerText;
var int2 = document.getElementById('intermediateValue2').innerText;
var int3 = document.getElementById('intermediateValue3').innerText;
if (maxResult === '–') {
alert('No results to copy yet.');
return;
}
var textToCopy = "Estimated 1RM Calculator Results:\n\n" +
"Estimated Max: " + maxResult + " " + unit + "\n" +
"Formula: " + formula + "\n\n" +
"Key Estimates:\n" +
"- " + int1 + "\n" +
"- " + int2 + "\n" +
"- " + int3 + "\n";
navigator.clipboard.writeText(textToCopy).then(function() {
alert('Results copied to clipboard!');
}).catch(function(err) {
console.error('Failed to copy: ', err);
alert('Failed to copy results. Please copy manually.');
});
}
// Charting Functionality
var liftChartInstance = null;
function updateChartAndTable(current1RM, currentWeight, currentReps, formulaType) {
var ctx = document.getElementById('liftChart').getContext('2d');
var tableBody = document.getElementById('progressTableBody');
tableBody.innerHTML = "; // Clear existing table rows
var repRanges = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15]; // Reps to plot
var chartDataMax = [];
var chartDataCurrentWeight = [];
var formulaSelected = document.getElementById('formula');
var selectedFormulaType = formulaSelected.value; // Use the actual selected formula for plotting
// Clear previous chart instance if it exists
if (liftChartInstance) {
liftChartInstance.destroy();
}
var labels = [];
var dataSeries1 = []; // Estimated 1RM for each rep
var dataSeries2 = []; // Weight needed for a specific rep count if 1RM were X (inverse calc)
var formulaFunction = function(w, r) {
if (selectedFormulaType === 'epley') return w * (1 + (r / 30));
if (selectedFormulaType === 'brzycki') return w / (1.0278 – (0.0278 * r));
if (selectedFormulaType === 'mcdavid') return (w * r * 0.0333) + w;
if (selectedFormulaType === 'oconner') return w * (1 + (r / 3));
return 0; // Default case
};
var formulaInverseFunction = function(target1RM, r) {
if (selectedFormulaType === 'epley') return target1RM / (1 + (r / 30));
if (selectedFormulaType === 'brzycki') return target1RM * (1.0278 – (0.0278 * r));
if (selectedFormulaType === 'mcdavid') return (target1RM – currentWeight) / (r * 0.0333); // This inverse isn't straightforward for McDavid, approximating based on initial weight
if (selectedFormulaType === 'oconner') return target1RM / (1 + (r / 3));
return 0;
}
var currentWeightNum = parseFloat(document.getElementById('weight').value);
var currentRepsNum = parseInt(document.getElementById('reps').value);
var current1Rmnum = parseFloat(current1RM);
// Generate data for the chart and table
for (var i = 0; i 0 && !isNaN(estimatedWeightForRep) && estimatedWeightForRep > 0) {
labels.push(reps.toString());
dataSeries1.push(estimatedMax);
// Only add second series if it makes sense (e.g. not plotting weight for 1 rep when 1RM is already known)
if (reps > 1 && reps !== currentRepsNum) {
dataSeries2.push(estimatedWeightForRep);
} else {
dataSeries2.push(null); // Placeholder if not applicable
}
// Add row to table
var row = tableBody.insertRow();
var cellReps = row.insertCell(0);
var cellMaxWeight = row.insertCell(1);
var cellFormula = row.insertCell(2);
cellReps.innerText = reps;
cellMaxWeight.innerText = estimatedMax.toFixed(1) + ' ' + selectedUnit;
cellFormula.innerText = formulaName.split(':')[0]; // Just the formula name
}
}
// Filter out nulls for the second data series if needed
var filteredDataSeries2 = dataSeries2.filter(function(val) { return val !== null; });
// Dynamically adjust the chart's data series based on availability and relevance
var datasets = [
{
label: 'Estimated Max Weight for Reps',
data: dataSeries1,
borderColor: '#004a99',
backgroundColor: 'rgba(0, 74, 153, 0.1)',
fill: false,
tension: 0.1
}
];
// Add the second series only if it contains valid data points and makes sense to display
if (filteredDataSeries2.length > 0 && dataSeries1.length === labels.length) {
datasets.push({
label: 'Weight for Reps at Current 1RM',
data: dataSeries2, // Use original dataSeries2 to maintain alignment if nulls were intentional
borderColor: '#28a745',
backgroundColor: 'rgba(40, 167, 69, 0.1)',
fill: false,
tension: 0.1
});
}
liftChartInstance = new Chart(ctx, {
type: 'line',
data: {
labels: labels,
datasets: datasets
},
options: {
responsive: true,
maintainAspectRatio: true, // Allow aspect ratio to adjust
scales: {
y: {
beginAtZero: false,
title: {
display: true,
text: 'Weight (' + selectedUnit.toUpperCase() + ')'
}
},
x: {
title: {
display: true,
text: 'Reps Performed'
}
}
},
plugins: {
legend: {
position: 'top',
},
title: {
display: true,
text: 'Estimated Strength Progression'
}
}
}
});
}
function clearChartAndTable() {
var ctx = document.getElementById('liftChart').getContext('2d');
if (liftChartInstance) {
liftChartInstance.destroy();
liftChartInstance = null;
}
document.getElementById('progressTableBody').innerHTML = "; // Clear table
}
// Initialize calculator on page load
window.onload = function() {
resetCalculator();
// Load Chart.js library dynamically if it's not already present
if (typeof Chart === 'undefined') {
var script = document.createElement('script');
script.src = 'https://cdn.jsdelivr.net/npm/chart.js@3.7.0/dist/chart.min.js'; // Using a specific version
script.onload = function() {
console.log('Chart.js loaded.');
// Recalculate after Chart.js is loaded to ensure chart is drawn
resetCalculator();
};
script.onerror = function() {
console.error('Failed to load Chart.js.');
// Optionally display a message to the user that charting is unavailable
};
document.head.appendChild(script);
} else {
console.log('Chart.js already loaded.');
// If already loaded, just recalculate
resetCalculator();
}
};