Student Loan Calculator
Estimate monthly payments, total interest, and see how extra payments shorten your payoff timeline
Loan Details
Optional: extra payment toward principal each month
Repayment Summary
Monthly Payment
$379.84
Total Interest
$10.58K
Total Cost
$45.58K
Payoff Time
120 mo
(10.0 yr)
Interest-to-Loan
30.2%
Amortization Schedule (Yearly Summary)
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1 | $2,700.50 | $1,857.60 | $32,299.50 |
| 2 | $2,852.83 | $1,705.27 | $29,446.66 |
| 3 | $3,013.76 | $1,544.35 | $26,432.91 |
| 4 | $3,183.76 | $1,374.35 | $23,249.15 |
| 5 | $3,363.34 | $1,194.76 | $19,885.80 |
| 6 | $3,553.06 | $1,005.04 | $16,332.74 |
| 7 | $3,753.48 | $804.62 | $12,579.26 |
| 8 | $3,965.21 | $592.89 | $8,614.05 |
| 9 | $4,188.88 | $369.22 | $4,425.17 |
| 10 | $4,425.17 | $132.94 | $0.00 |
Complete Guide to Student Loan Repayment
What is a Student Loan?
A student loan is a type of installment debt used to finance education expenses such as tuition, books, and living costs. The borrower agrees to repay the principal plus interest over a fixed term, typically 10 to 25 years. Interest rates can be fixed or variable depending on the loan type and lender.
Understanding how your monthly payment splits between principal and interest is essential for making smart repayment decisions. Use our Loan Amortization Calculator for a detailed month-by-month breakdown of any loan type, or compare how student debt fits into your broader financial picture with the Debt-to-Income Ratio Calculator.
Student Loan Payment Formula
Standard Amortization (Fixed-Rate Loan):
PMT = P × r × (1 + r)^n / ((1 + r)^n − 1)
Total Interest = (PMT × n) − P
Where: P = loan principal, r = monthly interest rate (annual rate ÷ 12), n = total number of monthly payments (years × 12)
Extra payments reduce the principal directly, shortening the loan and decreasing total interest. The Simple Interest Calculator can help you understand the difference between simple and compound interest accrual methods.
Benefits of This Calculator
Extra Payment Analysis
See exactly how much interest you save and how many months earlier you become debt-free by adding extra payments each month — even small amounts make a significant difference.
Yearly Amortization View
A scrollable yearly summary shows how each year's payments split between principal and interest, making it easy to track progress toward payoff.
Multi-Currency Support
Works with 9 major currencies, making it useful for students in any country with installment-based education loans — not just USD-denominated debt.
Interest-to-Loan Ratio
Instantly see what percentage of your total cost is pure interest. A ratio above 30% signals that refinancing or extra payments could save you thousands.
Tips for Paying Off Student Loans Faster
Round Up Payments: Rounding your payment up to the nearest $50 or $100 chips away at principal without dramatically affecting your budget. On a $380 payment, rounding to $400 saves hundreds in interest over the life of the loan.
Target High-Rate Loans First: If you have multiple student loans, focus extra payments on the highest interest rate first (avalanche method). Use our Debt Payoff Calculator to compare snowball vs avalanche strategies across all your debts.
Consider Refinancing: If your credit score has improved since graduation, refinancing can significantly lower your rate. A 2% rate reduction on $40,000 over 10 years saves over $4,500 in interest. Compare the new terms against your current loan using this calculator.
Common Student Loan Mistakes
Extending the Term to Lower Payments
Stretching a 10-year loan to 20 years halves the monthly payment but can nearly double the total interest paid. A $35,000 loan at 5.5% costs $10,599 in interest over 10 years but $22,900 over 20 years — an extra $12,300 for the convenience of lower monthly payments.
Ignoring Interest During Grace Periods
On unsubsidized loans, interest accrues during school and grace periods and capitalizes (adds to principal) when repayment begins. Making interest-only payments during grace periods prevents the balance from growing before you start full repayment.
Not Checking Employer Repayment Benefits
Many employers now offer student loan repayment assistance as a benefit — typically $100-300/month toward your loans. Failing to enroll or not factoring this into your repayment strategy means leaving free money on the table, similar to not capturing a 401(k) employer match.
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OpenFrequently Asked Questions
What is a student loan calculator?
A student loan calculator estimates your monthly payment, total interest, and payoff timeline based on your loan balance, interest rate, and repayment term. It uses the standard amortization formula: PMT = P × r(1+r)^n / ((1+r)^n − 1), where P is the principal, r is the monthly rate, and n is the total number of payments.
How is student loan interest calculated?
Student loan interest accrues daily on the outstanding principal balance. The daily interest charge equals (Annual Rate / 365) × Outstanding Balance. Each monthly payment covers the accrued interest first, with the remainder reducing the principal. Early in the loan, most of your payment goes toward interest; over time, the principal share grows.
How does making extra payments help?
Extra payments go directly toward the principal balance, reducing future interest charges. For example, on a $35,000 loan at 5.5% over 10 years, adding $100/month in extra payments saves roughly $2,800 in interest and pays off the loan about 2 years early. The savings compound because each dollar of reduced principal means less interest every subsequent month.
What is the difference between this and the Loan Amortization Calculator?
The Loan Amortization Calculator handles any secured or unsecured loan with a detailed month-by-month schedule. This Student Loan Calculator is tailored for education debt — it defaults to typical student loan parameters, includes extra-payment savings analysis, and shows how quickly additional payments can eliminate the debt. Use the Loan Amortization Calculator for mortgages or auto loans with different term structures.
What are common mistakes when repaying student loans?
Three costly mistakes: (1) Only making minimum payments when you can afford more — even $50/month extra significantly reduces total interest. (2) Ignoring the interest rate and focusing only on monthly payment — extending the term lowers the payment but dramatically increases total interest paid. (3) Not considering refinancing when rates drop — refinancing from 6.5% to 4.5% on a $40,000 balance saves thousands over the loan life.
Can you show a worked example?
For a $35,000 loan at 5.5% APR over 10 years (120 months): monthly payment = $35,000 × 0.004583 × 1.004583^120 / (1.004583^120 − 1) = $379.99/month. Total paid = $45,599, total interest = $10,599, interest-to-loan ratio = 30.3%. Adding $100/month extra reduces payoff to ~94 months and saves ~$2,800 in interest.