Credit Score Impact Estimator

ANA›Life Services Authority›National Calculator Authority›Credit Score Impact Estimator

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Credit Score Impact Estimator

Estimate how key financial actions—paying down debt, opening new accounts, missing payments—affect your FICO credit score across all five scoring categories.

Current Credit Score (300–850)

Total Revolving Debt ($)

Total Revolving Credit Limit ($)

Planned Debt Paydown ($)

Missed Payments (last 24 months)

New Accounts Opened (last 12 months)

Hard Inquiries (last 12 months)

Age of Oldest Account (years)

Average Account Age (years)

Credit Mix Score (1=Poor, 2=Fair, 3=Good, 4=Excellent)

1 – Poor (only 1 type) 2 – Fair (2 types) 3 – Good (3 types) 4 – Excellent (4+ types)

Estimate Score Impact

function creCalc() { // --- Read inputs --- var currentScore = parseFloat(document.getElementById('cre-current-score').value); var totalDebt = parseFloat(document.getElementById('cre-total-debt').value); var totalLimit = parseFloat(document.getElementById('cre-total-limit').value); var paydown = parseFloat(document.getElementById('cre-paydown').value); var missedPayments = parseInt(document.getElementById('cre-missed-payments').value); var newAccounts = parseInt(document.getElementById('cre-new-accounts').value); var hardInquiries = parseInt(document.getElementById('cre-hard-inquiries').value); var oldestAccount = parseFloat(document.getElementById('cre-oldest-account').value); var avgAge = parseFloat(document.getElementById('cre-avg-age').value); var creditMix = parseInt(document.getElementById('cre-credit-mix').value);

// --- Validation --- var errors = []; if (isNaN(currentScore) || currentScore 850) errors.push("Current credit score must be between 300 and 850."); if (isNaN(totalDebt) || totalDebt totalDebt) errors.push("Paydown cannot exceed total revolving debt."); if (isNaN(missedPayments) || missedPayments 24) errors.push("Missed payments must be between 0 and 24."); if (isNaN(newAccounts) || newAccounts 20) errors.push("New accounts must be between 0 and 20."); if (isNaN(hardInquiries) || hardInquiries 20) errors.push("Hard inquiries must be between 0 and 20."); if (isNaN(oldestAccount) || oldestAccount 50) errors.push("Oldest account age must be between 0 and 50 years."); if (isNaN(avgAge) || avgAge 50) errors.push("Average account age must be between 0 and 50 years."); if (avgAge > oldestAccount) errors.push("Average account age cannot exceed oldest account age.");

var resultDiv = document.getElementById('cre-result'); if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

// ============================================================ // FICO SCORE MODEL // FICO weights: Payment History 35%, Utilization 30%, // Length of History 15%, New Credit 10%, Credit Mix 10% // Score range: 300–850 → 550 usable points // ============================================================

var SCORE_RANGE = 550; // 850 - 300

// ---- 1. PAYMENT HISTORY (35%) ---- // Perfect = 1.0; each missed payment in last 24 months reduces by 0.12 (capped at 0) var paymentHistoryRatio = Math.max(0, 1.0 - (missedPayments * 0.12)); var paymentHistoryScore = paymentHistoryRatio * 0.35 * SCORE_RANGE;

// ---- 2. CREDIT UTILIZATION (30%) ---- // Current utilization var currentUtil = totalDebt / totalLimit; // New utilization after paydown var newDebt = Math.max(0, totalDebt - paydown); var newUtil = newDebt / totalLimit;

// Utilization scoring function (FICO penalizes heavily above 30%) // Score = 1.0 if util = 20) return 1.00; if (y >= 10) return 0.90 + ((y - 10) / 10) * 0.10; if (y >= 5) return 0.70 + ((y - 5) / 5) * 0.20; if (y >= 2) return 0.40 + ((y - 2) / 3) * 0.30; return (y / 2) * 0.40; } // Average age: 0yr=0, 2yr=0.5, 5yr=0.8, 10+yr=1.0 function avgAgeRatio(y) { if (y >= 10) return 1.00; if (y >= 5) return 0.80 + ((y - 5) / 5) * 0.20; if (y >= 2) return 0.50 + ((y - 2) / 3) * 0.30; return (y / 2) * 0.50; } var lengthRatio = (oldestAgeRatio(oldestAccount) * 0.6) + (avgAgeRatio(avgAge) * 0.4); var lengthScore = lengthRatio * 0.15 * SCORE_RANGE;

// ---- 4. NEW CREDIT (10%) ---- // Hard inquiries: each costs ~5 pts (FICO), new accounts reduce avg age // Inquiry penalty: 0 inquiries = 1.0; each inquiry reduces by 0.15 (min 0) var inquiryRatio = Math.max(0, 1.0 - (hardInquiries * 0.15)); // New accounts penalty: 0 = 1.0; each new account reduces by 0.10 (min 0) var newAcctRatio = Math.max(0, 1.0 - (newAccounts * 0.10)); var newCreditRatio = (inquiryRatio * 0.6) + (newAcctRatio * 0.4); var newCreditScore = newCreditRatio * 0.10 * SCORE_RANGE;

// ---- 5. CREDIT MIX (10%) ---- // 1=0.40, 2=0.65, 3=0.85, 4=1.00 var mixRatios = {1: 0.40, 2: 0.65, 3: 0.85, 4: 1.00}; var mixScore = mixRatios[creditMix] * 0.10 * SCORE_RANGE;

// ---- RECONSTRUCT CURRENT SCORE FROM INPUTS ---- // This calculator uses the current utilization for the baseline var reconstructed = 300 + paymentHistoryScore + currentUtilScore + lengthScore + newCreditScore + mixScore;

// ---- ESTIMATED NEW SCORE (after paydown) ---- var estimatedNew = reconstructed + utilizationDelta;

// ---- CALIBRATE TO USER'S STATED CURRENT SCORE ---- // Apply a calibration offset so the "current" matches what user entered var calibrationOffset = currentScore - reconstructed; var calibratedNew = Math.min(850, Math.max(300, Math.round(estimatedNew + calibrationOffset))); var scoreDelta = calibratedNew - currentScore;

// ---- UTILIZATION DETAILS ---- var currentUtilPct = (currentUtil * 100).toFixed(1); var newUtilPct = (newUtil * 100).toFixed(1);

// ---- SCORE BAND ---- function scoreBand(s) { if (s >= 800) return {label: "Exceptional", color: "#27ae60"}; if (s >= 740) return {label: "Very Good", color: "#2ecc71"}; if (s >= 670) return {label: "Good", color: "#f39c12"}; if (s >= 580) return {label: "Fair", color: "#e67e22"}; return {label: "Poor", color: "#c0392b"}; } var currentBand = scoreBand(currentScore); var newBand = scoreBand(calibratedNew);

// ---- IMPACT BREAKDOWN ---- var deltaColor = scoreDelta >= 0 ? "#27ae60" : "#c0392b"; var deltaSign = scoreDelta >= 0 ? "+" : "";

// ---- COMPONENT CONTRIBUTIONS (% of max possible) ---- var phPct = (paymentHistoryScore / (0.35 * SCORE_RANGE) * 100).toFixed(0); var utilPct = (newUtilScore / (0.30 * SCORE_RANGE) * 100).toFixed(0); var lenPct = (lengthScore / (0.15 * SCORE_RANGE) * 100).toFixed(0); var ncPct = (newCreditScore / (0.10 * SCORE_RANGE) * 100).toFixed(0); var mixPct = (mixScore / (0.10 * SCORE_RANGE) * 100).toFixed(0);

function barColor(pct) { if (pct >= 80) return "#27ae60"; if (pct >= 55) return "#f39c12"; return "#c0392b"; } function bar(pct) { var c = barColor(parseInt(pct)); return '' + ''; }

// ---- RECOMMENDATIONS ---- var recs = []; if (newUtil > 0.30) recs.push("Reduce revolving utilization below 30% (currently " + newUtilPct + "% after paydown) for the biggest score boost."); if (newUtil > 0.10) recs.push("Reducing utilization below 10% can yield maximum points in the utilization category."); if (missedPayments > 0) recs.push("Missed payments have a severe impact. Set up autopay to prevent future missed payments."); if (hardInquiries >= 3) recs.push("Multiple hard inquiries signal risk. Avoid applying for new credit unless necessary."); if (newAccounts >= 3) recs.push("Opening many new accounts lowers your average account age. Space out new applications."); if (avgAge ' + '' + 'Current Score' + '' + currentScore + '' + '' + currentBand.label + '' + '' + '' + 'Estimated New Score' + '' + calibratedNew + '' + '' + newBand.label + '' + '' + '' + 'Score Change' + '' + deltaSign + scoreDelta + '' + 'points' + '' + '' +

'#### Utilization Impact ' + '' + 'MetricBeforeAfter Paydown' + 'Revolving Debt$' + totalDebt.toLocaleString() + '$' + newDebt.toLocaleString() + '' + 'Utilization Rate' + currentUtilPct + '%' + newUtilPct + '%' + '' +

'#### Score Component Health ' + '' + 'CategoryFICO WeightYour Score' + 'Payment History35%' + phPct + '%' + bar(phPct) + '' + 'Credit Utilization30%' + utilPct + '%' + bar(utilPct) + '' + 'Length of History15%' + lenPct + '%' + bar(lenPct) + '' + 'New Credit10%' + ncPct + '%' + bar(ncPct) + '' + 'Credit Mix10%' + mixPct + '%' + bar(mixPct) + '' + '' +

'#### Recommendations ' + '' + recsHtml + ''; }

#### Formula & Model

This estimator uses the FICO scoring framework with five weighted categories:

Payment History (35%): Score ratio = max(0, 1 − missed_payments × 0.12). Each missed payment in the last 24 months reduces this component by 12%.
Credit Utilization (30%): Piecewise linear penalty function: full score (util ≤ 10%), gradual decline to 85% at 30%, 50% at 50%, 10% at 75%, 0% at 100%. Applied to both current and post-paydown utilization to compute the delta.
Length of Credit History (15%): Weighted blend — oldest account age (60%) + average account age (40%) — each mapped via a piecewise curve (e.g., 10+ years oldest = 90% of max).
New Credit (10%): Inquiry ratio = max(0, 1 − inquiries × 0.15); new account ratio = max(0, 1 − new_accounts × 0.10). Combined as 60% inquiry + 40% new accounts.
Credit Mix (10%): Fixed ratios: 1 type = 40%, 2 = 65%, 3 = 85%, 4+ = 100%.

Score reconstruction: Estimated_Score = 300 + Σ(component_ratio × weight × 550). A calibration offset aligns the model output to the user's stated current score. The post-paydown score applies only the utilization delta on top of the calibrated baseline.

Score range: 300 (minimum) to 850 (maximum) = 550 usable points.

#### Assumptions & References

Based on the FICO® Score model, the most widely used credit scoring model in the U.S. (used in 90%+ of lending decisions).
FICO weights sourced from: myFICO.com — "What's in my FICO Scores?" (myfico.com/credit-education/whats-in-your-credit-score).
This tool provides estimates only. Actual FICO scores depend on proprietary algorithms, exact account history, and data from all three bureaus (Equifax, Experian, TransUnion).

Credit Score Impact Estimator

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