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Calculator Answers

Student Loan Calculator

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

A student loan calculator is a financial planning tool that computes the monthly payments and total interest associated with student debt. The calculator applies the standard amortization formula to the principal balance, annual interest rate, and repayment term, outputting the monthly installment amount. It also generates an amortization schedule showing the portion of each payment directed toward interest and principal. Student borrowers use this utility to evaluate repayment plans, compare refinancing options, and estimate the financial impact of making extra payments.

Enter your loan balance, interest rate, and repayment term. The calculator returns the monthly payment, total interest, and payoff time. Add an extra monthly payment to see the months and interest saved.

Quick Answer

Calculate your monthly student loan payments, total interest costs, and payoff schedule. Enter your loan balance, interest rate, and term for instant estimates.

Student loan terms

$
%
years

Standard federal is 10 years.

$

Optional. Try $50, $100, etc. to see interest saved.

Important scope notes

  • This is a standard amortization calculator. It does not model federal income-driven repayment plans (IBR, PAYE, SAVE, ICR), Public Service Loan Forgiveness, or other policy-based repayment.
  • Federal student loan rules change frequently. For income-driven plans, forgiveness eligibility, or current policy, use the official studentaid.gov tools.
  • Capitalized interest from grace periods or deferment is not modeled here; enter your current loan balance after any capitalization.

Educational estimate. Not financial, legal, tax, or repayment-plan advice.

Repayment estimate

Monthly payment

$333.06

Total paid $39,967.38 over 10 yr; interest $9,967.38

Scheduled payment$333.06
Total interest (no extra)$9,967.38
Total paid (no extra)$39,967.38

Paying even a small amount above the scheduled payment can cut years off the loan and save significant interest. The extra goes straight to principal.

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Examples

$30,000 at 6% for 10 yr

Monthly $333; total interest $9,967

$30,000 at 6% for 10 yr + $100 extra

Payoff ~7 yr 6 mo; ~$3,140 interest saved

$50,000 at 6.5% for 20 yr

Monthly $373; total interest $39,477

$10,000 at 4% for 5 yr

Monthly $184; total interest $1,050

How it works

Standard student loan repayment uses the same amortization formula as a mortgage or car loan. The monthly payment covers interest on the remaining balance plus a principal payment sized so the balance reaches zero at the end of the term.

Payment · P = L · r / (1 − (1+r)^−n)

Extra payments go to principal, shortening the loan and reducing total interest paid.

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Frequently asked questions

Standard amortization. Monthly rate is annual rate divided by 12. The payment that fully pays off the balance in the chosen term is calculated by the standard formula P = L · r / (1 − (1+r)^−n).

No. IBR, PAYE, SAVE, ICR, and similar federal plans depend on your discretionary income, family size, and current policy, all of which change. Use the official tools at studentaid.gov for those plans. This page is a straightforward amortization calculator.

Not modeled. Forgiveness depends on employment, plan, payments made, and current rules. Calculate your standard repayment here for the baseline, and use official guidance for forgiveness eligibility.

It depends on the rate and remaining term. An extra $100/month on a $30,000 loan at 6% over 10 years can cut about 2 years off the term and save a few thousand dollars in interest. Try different extra amounts in the calculator.

Either calculate each separately, or estimate a blended rate and run the total balance through the calculator. For exact payoff strategy, the standard advice is to attack the highest-rate loan first (avalanche) or the smallest balance first (snowball).

Maybe, but the calculator does not give that advice. Refinancing federal loans into a private loan loses federal benefits like income-driven plans and forgiveness. Calculate the savings here as one input to a larger decision.