Use this calculator to get an estimated value for your used car, based on common factors that influence market price. Please note this is an estimation and not an official Kelley Blue Book valuation.
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Miles
Excellent
Good
Fair
Poor
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function calculateCarValue() {
var originalMSRP = parseFloat(document.getElementById('originalMSRP').value);
var carYear = parseInt(document.getElementById('carYear').value);
var currentMileage = parseFloat(document.getElementById('currentMileage').value);
var carCondition = document.getElementById('carCondition').value;
var accidentHistory = document.querySelector('input[name="accidentHistory"]:checked').value;
var premiumFeaturesValue = parseFloat(document.getElementById('premiumFeaturesValue').value);
// Input validation
if (isNaN(originalMSRP) || originalMSRP <= 0) {
document.getElementById('result').innerHTML = 'Please enter a valid Original MSRP.';
return;
}
var currentFullYear = new Date().getFullYear();
if (isNaN(carYear) || carYear currentFullYear) {
document.getElementById('result').innerHTML = 'Please enter a valid Car Model Year (between 1900 and ' + currentFullYear + ').';
return;
}
if (isNaN(currentMileage) || currentMileage < 0) {
document.getElementById('result').innerHTML = 'Please enter valid Current Mileage.';
return;
}
if (isNaN(premiumFeaturesValue) || premiumFeaturesValue 0) {
var tempValue = originalMSRP;
for (var i = 1; i = 2 && i = 4 && i 0) {
// Higher mileage: deduct more
mileageAdjustment = -mileageDifference * 0.25; // $0.25 per mile over average
} else if (mileageDifference < 0) {
// Lower mileage: add less
mileageAdjustment = Math.abs(mileageDifference) * 0.10; // $0.10 per mile under average
}
estimatedValue += mileageAdjustment;
// 3. Condition Adjustment
var conditionMultiplier;
switch (carCondition) {
case 'excellent':
conditionMultiplier = 1.05; // +5%
break;
case 'good':
conditionMultiplier = 1.00; // No change
break;
case 'fair':
conditionMultiplier = 0.90; // -10%
break;
case 'poor':
conditionMultiplier = 0.75; // -25%
break;
default:
conditionMultiplier = 1.00;
}
estimatedValue *= conditionMultiplier;
// 4. Accident History Adjustment
if (accidentHistory === 'yes') {
var accidentDeduction = 2500; // Fixed deduction for accident history
estimatedValue -= accidentDeduction;
}
// 5. Premium Features Value
estimatedValue += premiumFeaturesValue;
// Ensure value doesn't go below a reasonable minimum (e.g., $500)
estimatedValue = Math.max(500, estimatedValue);
document.getElementById('result').innerHTML =
'Estimated KBB Car Value:$' + estimatedValue.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ",") + '' +
'This is an estimation based on simplified factors and should not be considered an official Kelley Blue Book valuation. For a precise valuation, please visit KBB.com.';
}
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font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f9f9f9;
padding: 25px;
border-radius: 10px;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
max-width: 600px;
margin: 30px auto;
border: 1px solid #e0e0e0;
}
.calculator-container h2 {
color: #2c3e50;
text-align: center;
margin-bottom: 20px;
font-size: 1.8em;
}
.calculator-container p {
color: #555;
margin-bottom: 15px;
line-height: 1.6;
}
.calc-input-group {
margin-bottom: 18px;
display: flex;
flex-direction: column;
align-items: flex-start;
position: relative; /* For positioning the span */
}
.calc-input-group label {
margin-bottom: 8px;
color: #333;
font-weight: bold;
font-size: 0.95em;
}
.calc-input-group input[type="number"],
.calc-input-group select {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 5px;
font-size: 1em;
box-sizing: border-box;
transition: border-color 0.3s ease;
padding-right: 40px; /* Make space for the span */
}
.calc-input-group input[type="number"]:focus,
.calc-input-group select:focus {
border-color: #007bff;
outline: none;
}
.calc-input-group span {
position: absolute;
right: 10px;
top: 65%; /* Adjust vertical alignment */
transform: translateY(-50%);
color: #666;
font-size: 0.9em;
pointer-events: none; /* Allow clicks to pass through to input */
}
.radio-group {
display: flex;
gap: 15px;
margin-top: 5px;
}
.radio-group input[type="radio"] {
margin-right: 5px;
}
.radio-group label {
font-weight: normal;
color: #555;
margin-bottom: 0;
}
button {
background-color: #007bff;
color: white;
padding: 12px 25px;
border: none;
border-radius: 5px;
font-size: 1.1em;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
width: 100%;
margin-top: 20px;
}
button:hover {
background-color: #0056b3;
transform: translateY(-2px);
}
.calc-result {
margin-top: 25px;
padding: 15px;
background-color: #e9f7ef;
border: 1px solid #d4edda;
border-radius: 8px;
text-align: center;
font-size: 1.1em;
color: #155724;
}
.calc-result p {
margin: 5px 0;
}
.calc-result .result-value {
font-size: 1.6em;
font-weight: bold;
color: #007bff;
}
.calc-result .disclaimer {
font-size: 0.85em;
color: #6c757d;
margin-top: 15px;
}
.calc-result .error {
color: #dc3545;
font-weight: bold;
}
Understanding Your Car's Value with Kelley Blue Book
When it comes to buying, selling, or trading in a used car, knowing its market value is crucial. Kelley Blue Book (KBB) has been a trusted resource for car valuations for nearly a century, providing consumers and dealers with estimated prices based on a vast array of data points.
What is Kelley Blue Book?
Kelley Blue Book is an automotive research company that provides vehicle valuations and automotive research tools. Their "Blue Book Value" is a widely recognized benchmark for used car prices, helping both buyers and sellers make informed decisions. KBB collects data from various sources, including actual vehicle transactions, auction results, and market trends, to determine fair market values.
Key Factors Influencing Your Car's KBB Value
While KBB uses a complex, proprietary algorithm, several core factors consistently influence a car's valuation. Our estimator simplifies these to give you a general idea:
Make, Model, and Year: These are fundamental. Newer, more popular models generally hold their value better.
Original MSRP: The initial price of the car when new sets the baseline for its depreciation.
Mileage: Lower mileage typically means higher value, as it suggests less wear and tear. KBB considers average annual mileage for a vehicle's age.
Condition: This is a significant factor. KBB categorizes condition from "Excellent" to "Poor," assessing everything from mechanical soundness to cosmetic appearance. A well-maintained car with a clean interior and exterior will fetch a higher price.
Accident History: Vehicles with a reported accident history, especially those with significant damage, will almost always have a lower value.
Optional Features and Packages: Premium features like navigation systems, leather seats, sunroofs, advanced safety packages, or upgraded sound systems can add value.
Location: Market demand varies by region. A car popular in one state might be less sought after in another. (Our calculator simplifies this by not including it directly).
Market Conditions: Supply and demand, fuel prices, and economic trends can all impact used car values.
How Our KBB Car Value Estimator Works
Our calculator provides an estimated KBB value by applying a simplified model based on the most impactful factors:
Starting Point: It begins with the Original MSRP you provide, representing the car's initial value.
Age-Based Depreciation: Cars depreciate most rapidly in their first few years. Our calculator applies a tiered depreciation rate based on the car's age (Model Year vs. Current Year).
Mileage Adjustment: We compare your car's Current Mileage to an estimated average mileage for its age. Higher mileage leads to a deduction, while significantly lower mileage can result in a small increase.
Condition Multiplier: Based on your selected Car Condition (Excellent, Good, Fair, Poor), a multiplier is applied to adjust the value up or down.
Accident History Deduction: If you indicate an Accident History, a fixed deduction is applied to account for the diminished value.
Premium Features: Any additional Value of Premium Features/Options you specify is added to the total.
Example Calculation:
Let's use the following inputs:
Original MSRP: $30,000
Car Model Year: 2019
Current Mileage: 60,000 miles
Car Condition: Good
Accident History: No
Value of Premium Features: $2,000
Based on these inputs, our calculator would estimate a value around $16,045.40. This reflects the depreciation over 5 years, average mileage, good condition, and the added value of premium features.
Important Disclaimer:
This calculator is designed to provide a general estimation for educational and informational purposes only. It uses simplified assumptions and does not have access to the proprietary data and complex algorithms that Kelley Blue Book employs. For the most accurate and official KBB valuation, always visit the official KBB.com website and provide detailed information about your specific vehicle.