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Loan Payoff Calculator

Use this loan payoff calculator to estimate how long a loan takes to pay off and how much interest you pay with regular and extra payments.

Planning estimate

Live calculator

Loan payoff

Payoff time30 months

2.5 years at this payment.

Total interest$1,347.30

Estimated interest paid until payoff.

Total paid$13,347.30

Principal plus estimated interest.

Use this as a planning estimate. Taxes, fees, rates, account terms, provider policies, local rules, and timing can change real-world results.

Formula

Loan payoff formula

Monthly interest = balance x APR / 12; principal paid = payment - monthly interest; repeat until balance reaches zero

This calculator uses monthly compounding and assumes payments are made once per month.

How to use

Steps

  1. Enter the current loan balance.
  2. Enter the annual percentage rate.
  3. Enter the regular monthly payment.
  4. Add any extra monthly payment to see how payoff time changes.

Example

Sample calculation

Balance$12,000
APR8.5%
Payment$450/month
Payoff29 months

Calculator use

Best for

  • Estimating affordability, payment, payoff, interest, APR, refinance, rent, or debt scenarios before a money decision.
  • Comparing terms, rates, balances, fees, taxes, insurance, debt payments, or split shares with assumptions visible.

Before relying on it

Check first

  • Treating an estimate as an approval, quote, credit decision, payoff statement, tax result, or legal payment obligation.
  • Leaving out fees, escrow, insurance, property tax, PMI, minimum payments, compounding, promotional rates, or local rules.
  • Comparing scenarios with different time horizons, upfront costs, credit assumptions, or one-time versus monthly costs.

Details

What to know before using the result

Payment testMust cover interest

If the payment is less than the first month's interest, the balance will not fall and the loan cannot pay off in this model.

Extra paymentsApplied to principal

The calculator treats extra monthly payment as principal reduction after interest. Some lenders have specific instructions for extra principal payments.

Fees and timingNot included

Late fees, prepayment penalties, daily interest timing, and servicing rules can change a real payoff quote.

Source notes

References used for this calculator

Consumer Financial Protection BureauExplains how loan amortization shifts payments from interest toward principal as the balance declines.

Benchmarks

How to read the result

Payment barely covers interest: Slow payoff.

Most of the payment goes to interest, so the balance drops slowly.

Extra payment: Faster payoff.

Extra principal payments can reduce both payoff time and total interest.

High APR: Interest sensitive.

Higher interest rates make payment size and extra payments more important.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Monthly interest = balance x APR / 12; principal paid = payment - monthly interest; repeat until balance reaches zero

Inputs used

Loan balance, APR, Monthly payment, Extra payment

Limitations

Money results are planning estimates. Actual taxes, account terms, rates, fees, timing, local rules, and provider policies can change the real-world result.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Loan Payoff Calculator. https://toolkitshelf.com/tools/loan-payoff-calculator

FAQ

Common questions

How do extra payments affect loan payoff?

Extra payments usually reduce principal faster, which can shorten payoff time and lower total interest.

Why does the calculator say payment is too low?

That means the payment does not cover the first month's interest, so the balance would not go down.

Does this include fees?

No. It estimates principal and interest only unless fees are already included in the balance or payment.

Why can lender numbers differ from this result?

Lenders can use verified income, credit profile, reserves, fees, escrow rules, insurance, taxes, underwriting guidelines, and product-specific terms.

What assumption should I stress test?

Stress test rates, payment timing, fees, taxes, insurance, debt payments, and payoff timing before treating a loan or housing estimate as comfortable.