Toolkit ShelfFind

Money Calculators

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.

Last reviewed June 6, 2026Source note includedPlanning estimateNo expert review claimed

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.

Quick answer

Loan Payoff Calculator: what it calculates

Loan Payoff Calculator calculates payoff time from loan balance, APR, monthly payment, and extra payment. The visible formula is Monthly interest = balance x APR / 12; principal paid = payment - monthly interest; repeat until balance reaches zero.

ResultPayoff time
InputsLoan balance, APR, Monthly payment, Extra payment
FormulaLoan payoff formula

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

  • 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.
  • 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.
  • Preparing a planning estimate before checking lender, landlord, card issuer, or servicer numbers.

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

These notes make the assumptions explicit, especially where the same search query can mean slightly different things.

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

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions. Benchmark ranges are broad planning heuristics unless this page names a specific source for the range.

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

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

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.

Last reviewed

June 6, 2026

Cite this page

Toolkit Shelf. Loan Payoff Calculator. Last reviewed June 6, 2026. 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.

Is this a final financial decision?

No. Use it for planning and comparison. Real decisions can change after exact rates, balances, fees, taxes, account terms, timing, and personal details are verified.