Repayment Calculator

This calculator shows your monthly repayment, total interest, and a principal-vs-interest schedule — and compares six repayment periods side by side, so you can see exactly what choosing a longer or shorter term trades away.

For personal planning only — not financial advice.

Reviewed by CalculatorDrive Finance Editorial Board · Last updated

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Enter loan amount, interest rate, and repayment period in years to see your monthly payment and schedule.

The short answer

A $25,000 loan at 7.5% costs $500.95/month over a 5-year repayment period, with $5,056.92 in total interest (16.8% of everything paid). Shorten the term to 1 year and the payment jumps to $2,168.94/month but interest drops to just $1,027.23. Stretch it to 6 years and the payment falls to $432.25/month, but total interest nearly doubles to $6,122.20 compared to the 5-year term.

Key takeaways

  • Your repayment period is a lever you control: shorter terms mean higher monthly payments but dramatically less interest paid over the life of the loan.
  • On $25,000 at 7.5%, moving from a 1-year to a 6-year repayment period cuts the monthly payment from $2,168.94 to $432.25 — but total interest rises from $1,027.23 to $6,122.20, nearly six times as much.
  • The biweekly and weekly figures this calculator shows are the monthly payment evenly split, not an accelerated payoff plan — they take the same 5 years and cost the same total interest as the monthly schedule.
  • A genuine biweekly-acceleration strategy (paying half the monthly amount every two weeks) results in 13 monthly-equivalents per year instead of 12, which does shorten the term and cut interest — but only if the lender applies the extra to principal.

Comparing repayment periods side by side

On a $25,000 loan at 7.5%, here is how the repayment period alone changes monthly payment and total interest:

Repayment Period Monthly Payment Total Interest
1 year$2,168.94$1,027.23
2 years$1,124.99$1,999.76
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

The pattern is consistent: every extra year of repayment period lowers the monthly payment but adds to total interest, because the balance has more time to accrue interest before it is paid off. There is no universally "right" term — the right choice depends on what monthly payment fits your budget versus how much extra cost you are willing to accept for that flexibility. Picking the shortest term your budget can comfortably support is usually the cheapest path overall.

Biweekly and weekly repayment: what actually saves interest

This calculator: biweekly = monthly ÷ 2 = $250.47 | weekly = monthly ÷ 4.33 = $115.69

True acceleration: 26 biweekly payments/year = 13 monthly-equivalents (not 12)

It is a common misconception that switching to biweekly payments automatically saves interest. The biweekly and weekly figures on this page are just the same $500.95 monthly payment divided evenly into smaller, more frequent pieces — 24 biweekly payments of $250.47 or roughly 52 weekly payments of $115.69 add up to the same $30,056.92 total, over the same 5-year term, with the same $5,056.92 in interest.

The interest savings people associate with "biweekly plans" come from a different mechanism: paying half your monthly payment every two weeks results in 26 payments a year, which is the equivalent of 13 monthly payments instead of 12 — one extra payment annually, applied to principal. That extra payment is what shortens the term and cuts interest, not the frequency by itself. Ask your lender explicitly whether a biweekly plan applies the extra payment to principal before assuming you are getting that benefit.

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Frequently Asked Questions

What does total loan repayment include?

Total repayment is the sum of every payment over the loan term, including principal and interest. It answers how much you will actually pay back, not just the monthly installment.

How is a fixed monthly repayment calculated?

Fixed-rate loans use standard amortization: each payment covers interest on the remaining balance plus a portion of principal. Early payments are weighted toward interest; later payments apply more to principal until the balance reaches zero.

Why does a longer repayment term cost more in interest?

A longer term means more months during which interest accrues on the outstanding balance. On a $25,000 loan at 7.5%, a 1-year term costs $1,027.23 in total interest at $2,168.94/month, while stretching to 6 years drops the payment to $432.25/month but pushes total interest to $6,122.20 — nearly six times as much, even though the rate never changed.

Can I reduce total repayment cost without changing the rate?

Yes. Extra payments toward principal shrink the balance that accrues interest each month, which can shorten the repayment period and lower total interest. Confirm with your lender that there is no prepayment penalty before making extra payments.

Do the biweekly and weekly repayment figures here save me interest?

Not automatically. The biweekly ($250.47) and weekly ($115.69) figures shown are simply the monthly payment split evenly into smaller, more frequent amounts — they total the same $30,056.92 and take the same 5 years to pay off. A true accelerated-biweekly plan, where you pay half the monthly amount every two weeks, results in 26 payments a year (13 monthly-equivalents instead of 12) and does cut both the term and total interest — but that only happens if your lender applies the extra payment to principal, not with a plain even split.

How do I use this repayment calculator?

Enter loan amount, annual interest rate, and repayment period in years, then click Calculate Repayment to see your monthly payment, total interest, and a principal-versus-interest schedule over time.

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