Note: This is an estimation based on standard FICO weighting models. Actual scores may vary.
How is Your Credit Score Calculated?
Credit scores are calculated using five main categories of data from your credit report. While proprietary models like FICO and VantageScore differ slightly, they generally follow these weightings:
35%Payment History: This is the most important factor. It tracks if you pay your bills on time. Even one late payment can significantly drop your score.
30%Amounts Owed (Utilization): This looks at how much of your available credit you are using. Ideally, you should keep your utilization below 30%.
15%Length of Credit History: A longer history is better. This accounts for the age of your oldest account, newest account, and the average age of all accounts.
10%Credit Mix: Lenders like to see that you can handle different types of credit, such as credit cards, retail accounts, installment loans, and mortgages.
10%New Credit: Opening several new credit accounts in a short period represents a higher risk, especially for people with a short credit history.
Practical Examples
Scenario A: The Perfect Score. A consumer with 100% on-time payments, 5% utilization, 15+ years of history, 10+ diverse accounts, and 0 inquiries will typically see a score in the 800-850 range.
Scenario B: The Builder. A consumer with 100% on-time payments but only 1 year of history and high utilization (70%) might see a score in the 630-670 range, even without late payments.
function calculateCreditScore() {
var onTime = parseFloat(document.getElementById("paymentHistory").value);
var util = parseFloat(document.getElementById("utilization").value);
var age = parseFloat(document.getElementById("creditAge").value);
var mix = parseFloat(document.getElementById("totalAccounts").value);
var inq = parseFloat(document.getElementById("inquiries").value);
// Validation
if (isNaN(onTime) || isNaN(util) || isNaN(age) || isNaN(mix) || isNaN(inq)) {
alert("Please fill in all fields with valid numbers.");
return;
}
// Base score is 300, max is 850. Range is 550 points.
var baseScore = 300;
var totalPoints = 0;
// 1. Payment History (35% = 192.5 points)
// Steep penalty for falling below 100%
if (onTime >= 100) totalPoints += 192.5;
else if (onTime >= 98) totalPoints += 150;
else if (onTime >= 95) totalPoints += 100;
else if (onTime >= 90) totalPoints += 50;
else totalPoints += 0;
// 2. Utilization (30% = 165 points)
if (util <= 10) totalPoints += 165;
else if (util <= 30) totalPoints += 130;
else if (util <= 50) totalPoints += 80;
else if (util 82.5) ageScore = 82.5;
totalPoints += ageScore;
// 4. Credit Mix (10% = 55 points)
var mixScore = (mix / 8) * 55;
if (mixScore > 55) mixScore = 55;
totalPoints += mixScore;
// 5. New Credit/Inquiries (10% = 55 points)
var inqPenalty = inq * 15;
var inqScore = 55 – inqPenalty;
if (inqScore 850) finalScore = 850;
if (finalScore = 800) {
category = "Exceptional";
color = "#28a745";
} else if (finalScore >= 740) {
category = "Very Good";
color = "#9cc332";
} else if (finalScore >= 670) {
category = "Good";
color = "#ffc107";
} else if (finalScore >= 580) {
category = "Fair";
color = "#fd7e14";
} else {
category = "Poor";
color = "#dc3545";
}
document.getElementById("finalScore").innerHTML = finalScore;
document.getElementById("finalScore").style.color = color;
document.getElementById("scoreCat").innerHTML = category;
document.getElementById("scoreCat").style.color = color;
document.getElementById("score-result-box").style.display = "block";
}