Payment Calculator

This calculator finds the payment on any fixed-rate installment loan — auto, personal, student, or mortgage — and breaks it into monthly, biweekly, and weekly amounts, plus a side-by-side look at how changing the term shifts total interest.

For personal planning only — not financial advice.

Reviewed by CalculatorDrive Finance Editorial Board · Last updated

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Enter your loan amount, interest rate, and term to see your monthly payment and breakdown.

The short answer

A $25,000 loan at 7.5% over 5 years costs $500.95 a month — $250.47 biweekly, $115.69 weekly — with $5,056.92 in total interest, 16.8% of everything paid. Shorten the term to 3 years and the payment rises to $777.66 but interest drops to $2,995.60; stretch it to 6 years and the payment falls to $432.25 while interest climbs to $6,122.20.

Key takeaways

  • $25,000 at 7.5% over 5 years: $500.95/month, $5,056.92 total interest (16.8% of total paid).
  • Biweekly ($250.47) and weekly ($115.69) equivalents are simple fractions of the monthly payment, useful for matching a paycheck schedule.
  • A 3-year term raises the payment to $777.66/month but nearly halves interest to $2,995.60 versus the 5-year term.
  • A 6-year term lowers the payment to $432.25/month but more than doubles interest to $6,122.20 compared to the 3-year option.

The payment formula, and biweekly/weekly equivalents

Monthly Payment = P × [r(1+r)^n] / [(1+r)^n − 1]

$25,000 at 7.5%/12 monthly rate, 60 payments = $500.95

Biweekly and weekly figures are just that monthly number divided down — half for biweekly, roughly a quarter for weekly (using 4.33 weeks per month) — not separate calculations with their own compounding. They're provided so the payment can be checked against how often you're actually paid, not because paying weekly changes the underlying loan math shown here.

How term length trades payment size for total interest

On the same $25,000 at 7.5%, only changing the term reshapes both numbers:

Term Monthly Payment Total Interest
3 years$777.66$2,995.60
4 years$604.47$4,014.68
5 years$500.95$5,056.92
6 years$432.25$6,122.20

Going from 3 to 6 years cuts the monthly payment by 44% ($777.66 to $432.25) but more than doubles total interest ($2,995.60 to $6,122.20). Neither term is objectively "right" — it's a trade-off between monthly cash flow and total cost, and the comparison table makes the size of that trade-off explicit rather than leaving it to guesswork.

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Frequently Asked Questions

How is a monthly loan payment calculated?

For a fixed-rate loan, the payment is derived from the loan amount, annual interest rate, and number of payments using the standard amortization formula. A $25,000 loan at 7.5% over 5 years comes to $500.95 a month, with $5,056.92 in total interest — 16.8% of everything paid.

Why is my early interest portion so large?

Interest is charged on the outstanding balance, which is at its peak at the start of the loan. In early payments, most of each installment covers interest; the principal share grows with each subsequent payment.

How do biweekly and weekly payments relate to monthly?

Biweekly payments are roughly half the monthly amount paid every two weeks; weekly payments are about one-quarter paid each week. On a $500.95 monthly payment, that works out to $250.47 biweekly and $115.69 weekly — useful for budgeting around a biweekly or weekly paycheck.

Does this payment include taxes or insurance?

No. This calculator shows principal and interest only. For a home loan, property taxes, homeowners insurance, PMI, and HOA fees are separate costs that significantly affect your total housing payment.

How much does loan term change the total interest?

Significantly. On the same $25,000 at 7.5%, a 3-year term costs $777.66/month with $2,995.60 in interest, while stretching to 6 years drops the payment to $432.25/month but more than doubles interest to $6,122.20 — a longer term trades a lower payment for a meaningfully higher total cost.

How do I use this payment calculator?

Enter loan amount, annual interest rate, loan term, and select years or months as the unit. Click Calculate Payment to see your monthly amount plus biweekly and weekly equivalents and a principal-versus-interest breakdown.

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