Student Loan Repayment Calculator
ANA›Life Services Authority›National Calculator Authority›Student Loan Repayment Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Student Loan Repayment Calculator
Estimate your monthly payment, total interest, and amortization schedule for your student loan using the standard amortization formula.
Loan Principal ($)
Annual Interest Rate (%)
Repayment Term (Years)
Extra Monthly Payment ($) (optional)
Calculate
Monthly Payment
Total Interest Paid
Total Amount Paid
Payoff Time
View Amortization Schedule
Month Payment Principal Interest Balance
function stuFmt(n) { return '$' + n.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ','); }
function stuCalc() { var errEl = document.getElementById('stu-error'); var resEl = document.getElementById('stu-result'); errEl.style.display = 'none'; resEl.style.display = 'none';
var P = parseFloat(document.getElementById('stu-principal').value); var annualRate = parseFloat(document.getElementById('stu-rate').value); var years = parseFloat(document.getElementById('stu-term').value); var extra = parseFloat(document.getElementById('stu-extra').value) || 0;
// Validation if (isNaN(P) || P 30 || !Number.isInteger(years)) { errEl.textContent = 'Please enter a repayment term between 1 and 30 whole years.'; errEl.style.display='block'; return; } if (extra 0.005 && month = balance) { // Final payment principalCharge = balance; payment = principalCharge + interestCharge; }
balance -= principalCharge; if (balance ' + month + '' + '' + stuFmt(payment) + '' + '' + stuFmt(principalCharge) + '' + '' + stuFmt(interestCharge) + '' + '' + stuFmt(balance) + ''; tbody.appendChild(tr); } }
// Payoff time string var payoffYears = Math.floor(month / 12); var payoffMonths = month % 12; var payoffStr = ''; if (payoffYears > 0) payoffStr += payoffYears + 'y '; if (payoffMonths > 0) payoffStr += payoffMonths + 'm'; if (payoffStr === '') payoffStr = ' 0) { var interestSaved = totalInterestStd - totalInterest; var monthsSaved = n - month; extraEl.innerHTML = '✓ By paying an extra ' + stuFmt(extra) + '/mo, you save ' + stuFmt(interestSaved) + ' in interest and pay off your loan ' + monthsSaved + ' month' + (monthsSaved !== 1 ? 's' : '') + ' early.'; extraEl.style.display = 'block'; } else { extraEl.style.display = 'none'; }
resEl.style.display = 'block'; }
#### Formula
Monthly Payment (M):
M = P × [r(1 + r)n] / [(1 + r)n − 1]
- P = Loan principal
- r = Monthly interest rate = Annual rate / 12
- n = Total number of monthly payments = Years × 12
Each month: Interest charge = Balance × r | Principal paid = Payment − Interest charge | New balance = Balance − Principal paid
Total Interest = Total Amount Paid − Principal
#### Assumptions & References
- Uses the standard fixed-rate amortization formula — the same method used by federal and private student loan servicers.
- Interest is compounded monthly (not daily); some lenders use daily compounding which may produce slightly different results.
- Extra payments are applied entirely to principal each month, reducing the balance faster.
- Federal student loan rates (2024–25): Undergraduate Direct Loans 6.53%, Graduate 8.08%, PLUS 9.08% — StudentAid.gov.
- Standard federal repayment term is 10 years; extended plans allow up to 25 years.
- Reference: CFPB Student Loan Repayment Guide.
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