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Mortgage repayment calculator
Put your loan, rate, term and extra payment in: $400,000.00 at 6.50% over 30 years is $2,528.27 a month, $910,177.95 in all, paid off in October 2056. The extra payment is the lever that changes everything.
★ MONEY · MORTGAGE · TOTAL REPAYMENT
Mortgage Repayment Calculator: Total Cost & Payoff Date
On the defaults — a $400,000.00 loan at 6.50% over 30 years — the monthly payment is $2,528.27, the total repaid is $910,177.95 and the loan is paid off in October 2056. This one is the REPAYMENT tool — the total cost, the payoff date, and what extra payments save — the mortgage-payment-calculator page is the PAYMENT tool — the monthly payment from price and down payment — not the total repaid; the amortization-calculator page is the AMORTIZATION tool — the payment split and the first-year schedule — not the payoff date or the extra-payment saving.
What does $510,177.95 of interest mean?
It means that a $400,000.00 loan at 6.50% over 30 years costs more in interest than the house you borrowed for — the monthly payment is $2,528.27, the total repaid is $910,177.95, and $510,177.95 of that is interest, paid off in October 2056. The interest is the price of spreading the loan over 30 years: the same loan over 15 years costs $3,484.43 a month and only $227,197.30 of interest — $282,980.65 less — because the balance falls faster and there are fewer years for interest to pile up. The monthly payment answers "what do I pay each month"; the total repaid answers "what does this loan actually cost me", and this page is built around the second question.
Three things to check before you trust the number
The extra payment is the lever that matters. An extra $200.00 a month on the defaults ends the loan in 293 months (March 2051) instead of 360 — 67 months sooner — and saves $111,891.54 of interest. An extra $500.00 a month ends it in 233 months (March 2046), 127 months sooner, and saves $205,557.14. The extra goes straight to principal, so it cuts the balance the interest is charged on, and the saving compounds: every dollar of principal paid early is a dollar that never earns interest again. The payment itself never changes — the loan just ends sooner.
The term is the second lever, and it is expensive in the other direction. A 15-year term costs $3,484.43 a month — $956.16 more than the 30-year payment — but the total interest is $227,197.30, less than half the 30-year $510,177.95. A 20-year term sits between them: $2,982.29 a month and $315,750.21 of interest. The shorter term is the cheaper loan by a wide margin; the longer term is the cheaper month. Which one wins depends on whether you can afford the higher payment.
The rate is the third lever, and a point is worth a fortune. At 7.50% instead of 6.50% the payment rises to $2,796.86 a month and the total interest rises to $606,868.89 — $96,690.94 more for the same $400,000.00 loan. A rate of 6.3923% would keep the payment at about $2,500.00 a month. That is why the rate you lock matters more than almost anything else in the loan: one percentage point over 30 years is worth roughly $100,000.00 here.
Worked example
On the defaults: a $400,000 loan at 6.50% over 30 years, $0 extra.
- The monthly payment: $400,000 × (0.065 ÷ 12) ÷ (1 − (1 + 0.065 ÷ 12)^−360) is $2,528.27.
- The total repaid: $2,528.27 × 360 months is $910,177.95.
- The total interest: $910,177.95 − $400,000 is $510,177.95.
- The payoff date: October 2026 + 360 months is October 2056.
And the other way: a $395,527.05 loan costs $2,500.00 a month at 6.50% over 30 years, an extra $454.03 a month pays the loan off in 20 years, and a rate of 6.3923% keeps the payment at about $2,500.00 a month (the exact payment at that rate is $2,500.01 — one cent over, because the rate is rounded to 4dp).
Every branch, checked
- $200 extra a month: $200 extra a month: Payment $2,728.27 a month — $400,000.00 at 6.50% over 30 years plus $200.00 extra. Total repaid $798,286.42, interest $398,286.42, paid off March 2051 (293 months).
- 15-year term instead of 30: 15-year term instead of 30: Payment $3,484.43 a month — $400,000.00 at 6.50% over 15 years. Total repaid $627,197.30, interest $227,197.30, paid off October 2041 (180 months).
- 7.50% rate instead of 6.50%: 7.50% rate instead of 6.50%: Payment $2,796.86 a month — $400,000.00 at 7.50% over 30 years. Total repaid $1,006,868.89, interest $606,868.89, paid off October 2056 (360 months).
- $300,000 loan instead of $400,000: $300,000 loan instead of $400,000: Payment $1,896.20 a month — $300,000.00 at 6.50% over 30 years. Total repaid $682,633.47, interest $382,633.47, paid off October 2056 (360 months).
- $500 extra a month: $500 extra a month: Payment $3,028.27 a month — $400,000.00 at 6.50% over 30 years plus $500.00 extra. Total repaid $704,620.81, interest $304,620.81, paid off March 2046 (233 months).
- 20-year term instead of 30: 20-year term instead of 30: Payment $2,982.29 a month — $400,000.00 at 6.50% over 20 years. Total repaid $715,750.21, interest $315,750.21, paid off October 2046 (240 months).
The reverses, worked backwards
- Loan for a $2,500 a month payment: $395,527.05 — at $395,527.05 the figures are Payment $2,500.00 a month — $395,527.05 at 6.50% over 30 years. Total repaid $900,000.00, interest $504,472.95, paid off October 2056 (360 months).; at the lower neighbor the figures are Payment $2,499.99 a month — $395,526.05 at 6.50% over 30 years. Total repaid $899,997.73, interest $504,471.68, paid off October 2056 (360 months).; at the upper neighbor the figures are Payment $2,500.01 a month — $395,528.05 at 6.50% over 30 years. Total repaid $900,002.28, interest $504,474.23, paid off October 2056 (360 months). — verdict: STEP.
- Extra payment to pay off in 20 years: $454.03 a month — at $454.03 a month the figures are Payment $2,982.30 a month — $400,000.00 at 6.50% over 30 years plus $454.03 extra. Total repaid $715,747.82, interest $315,747.82, paid off October 2046 (240 months).; at the lower neighbor the figures are Payment $2,981.30 a month — $400,000.00 at 6.50% over 30 years plus $453.03 extra. Total repaid $716,000.87, interest $316,000.87, paid off November 2046 (241 months).; at the upper neighbor the figures are Payment $2,983.30 a month — $400,000.00 at 6.50% over 30 years plus $455.03 extra. Total repaid $715,497.40, interest $315,497.40, paid off October 2046 (240 months). — verdict: STEP.
- Rate keeping the payment at $2,500 a month: 6.3923% — at 6.3923% the figures are Payment $2,500.01 a month — $400,000.00 at 6.39% over 30 years. Total repaid $900,002.63, interest $500,002.63, paid off October 2056 (360 months).; at the lower neighbor the figures are Payment $2,497.39 a month — $400,000.00 at 6.38% over 30 years. Total repaid $899,060.29, interest $499,060.29, paid off October 2056 (360 months).; at the upper neighbor the figures are Payment $2,502.63 a month — $400,000.00 at 6.40% over 30 years. Total repaid $900,945.38, interest $500,945.38, paid off October 2056 (360 months). — verdict: STEP.
What the defaults assume
The defaults are a $400,000 loan at 6.50% over 30 years with no extra payment, counted from October 2026. The payment is principal and interest only — it does not count property tax, homeowner's insurance, PMI, or HOA fees, which are the other half of a real monthly housing cost and vary by home and lender. The rate is fixed for the whole term; the model does not handle adjustable-rate loans, where the payment moves with the rate. Extra payments are assumed to go to principal with no prepayment penalty — most modern mortgages allow that, but check yours. The payoff date counts calendar months from October 28, 2026, and the months to payoff are simulated month by month, with any sub-cent remainder absorbed into the final payment, so a 30-year loan ends in exactly 360 months. The extra-payment reverse is the smallest whole-cent extra that pays the loan off in 240 months; the rate reverse is rounded to 4dp, so the payment at that rate is $2,500.01, not $2,500.00.
These notes repeat in every explainer section because this page is built to be read start to finish: the extra payment is the lever that matters; the term is the second lever; and the rate is the third lever.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Monthly payment | loan × r ÷ (1 − (1 + r)^−n) | $2,528.27 — $400,000.00 at 6.50% over 30 years. |
| Total repaid | payment × months | $910,177.95 — $2,528.27 × 360. |
| Total interest | total repaid − loan | $510,177.95 — $910,177.95 − $400,000.00. |
| Payoff date | start date + months to payoff | October 2056 — October 2026 + 360 months. |
| Reverse: Loan for a $2,500 a month payment | step | $395,527.05: Payment $2,500.00 a month — $395,527.05 at 6.50% over 30 years. Total repaid $900,000.00, interest $504,472.95, paid off October 2056 (360 months). |
| Reverse: Extra payment to pay off in 20 years | step | $454.03 a month: Payment $2,982.30 a month — $400,000.00 at 6.50% over 30 years plus $454.03 extra. Total repaid $715,747.82, interest $315,747.82, paid off October 2046 (240 months). |
| Reverse: Rate keeping the payment at $2,500 a month | step | 6.3923%: Payment $2,500.01 a month — $400,000.00 at 6.39% over 30 years. Total repaid $900,002.63, interest $500,002.63, paid off October 2056 (360 months). |
| $200 extra a month | same model | Payment $2,728.27 a month — $400,000.00 at 6.50% over 30 years plus $200.00 extra. Total repaid $798,286.42, interest $398,286.42, paid off March 2051 (293 months). |
| 15-year term instead of 30 | same model | Payment $3,484.43 a month — $400,000.00 at 6.50% over 15 years. Total repaid $627,197.30, interest $227,197.30, paid off October 2041 (180 months). |
| 7.50% rate instead of 6.50% | same model | Payment $2,796.86 a month — $400,000.00 at 7.50% over 30 years. Total repaid $1,006,868.89, interest $606,868.89, paid off October 2056 (360 months). |
| $300,000 loan instead of $400,000 | same model | Payment $1,896.20 a month — $300,000.00 at 6.50% over 30 years. Total repaid $682,633.47, interest $382,633.47, paid off October 2056 (360 months). |
| $500 extra a month | same model | Payment $3,028.27 a month — $400,000.00 at 6.50% over 30 years plus $500.00 extra. Total repaid $704,620.81, interest $304,620.81, paid off March 2046 (233 months). |
| 20-year term instead of 30 | same model | Payment $2,982.29 a month — $400,000.00 at 6.50% over 20 years. Total repaid $715,750.21, interest $315,750.21, paid off October 2046 (240 months). |
| $0 loan | same model | Payment $0.00 a month — $0.00 at 6.50% over 30 years. Total repaid $0.00, interest $0.00, paid off October 2026 (0 months). |
| 0% interest rate | same model | Payment $1,111.11 a month — $400,000.00 at 0.00% over 30 years. Total repaid $400,000.00, interest $0.00, paid off October 2056 (360 months). |
| 1-year term | same model | Payment $34,518.57 a month — $400,000.00 at 6.50% over 1 years. Total repaid $414,222.80, interest $14,222.80, paid off October 2027 (12 months). |
| $5,000 extra a month | same model | Payment $7,528.27 a month — $400,000.00 at 6.50% over 30 years plus $5,000.00 extra. Total repaid $472,992.15, interest $72,992.15, paid off January 2032 (63 months). |
Who uses this
- A homebuyer comparing loans — a $400,000.00 loan at 6.50% costs $510,177.95 of interest over 30 years but only $227,197.30 over 15: the total repaid, not just the payment, is what the two loans really cost.
- A homeowner with spare cash — an extra $200.00 a month saves $111,891.54 and ends the loan 67 months sooner: the reverses say exactly how much extra pays the loan off in 20 years.
- A borrower setting a budget — $395,527.05 is the biggest loan that still costs $2,500.00 a month at 6.50% over 30 years: the reverses set the budget before the house hunt starts.
- A student learning amortization — one worked example from the payment formula to the total repaid to the payoff date, and the branches that show how the term, the rate and the extra payment each move the total.
Accuracy & limitations
Figures are the model's own totals on the numbers you type, computed from unrounded values: the monthly payment is the standard amortization formula, and the months to payoff, the total repaid and the total interest are simulated month by month, with the final payment adjusted so the balance lands exactly on zero. The displayed figures are rounded to 2dp. The rate reverse is rounded to 4dp, so the payment at 6.3923% is $2,500.01 — one cent over the $2,500 target; the exact rate is 6.392272%. The extra-payment reverse is the smallest whole-cent extra that pays the loan off in 240 months. The model assumes a fixed rate, no fees, no prepayment penalty, and principal-and-interest only — it does not count property tax, insurance, PMI or HOA fees, and it does not model adjustable rates. Payoff dates count from October 28, 2026. This page is a calculation tool, not financial advice.
Cite this calculator
A $400,000.00 mortgage at 6.50% over 30 years costs $2,528.27 a month, $910,177.95 repaid in all and $510,177.95 of interest, paid off in October 2056. Source: Bright Side Kit, brightoolbox.com.
Frequently asked questions
How much interest do you pay on a $400,000 mortgage?
$510,177.95 of interest over 30 years at 6.50% — the total repaid is $910,177.95 on a $2,528.27 monthly payment. The interest is more than the loan itself, because 30 years is a long time to borrow.
How much does $200 extra a month save on a mortgage?
$111,891.54 of interest, and the loan ends 67 months sooner — in March 2051 instead of October 2056. The extra goes straight to principal, so the saving compounds.
Is a 15-year mortgage better than a 30-year mortgage?
On total cost, yes — the 15-year loan costs $227,197.30 of interest against $510,177.95 for the 30-year loan. But the payment is $3,484.43 a month instead of $2,528.27, so it only works if you can afford the higher payment.
What loan costs $2,500 a month at 6.50%?
$395,527.05 over 30 years. The reverses solve for any payment target — put your payment in and the calculator works the loan backwards.
How much extra do I need to pay off my mortgage in 20 years?
$454.03 a month on top of the $2,528.27 payment — $2,982.29 a month in all. That is the smallest whole-cent extra that pays a $400,000 loan off in 240 months at 6.50%.
What rate keeps my payment at $2,500 a month?
About 6.39% on a $400,000 loan over 30 years. The exact rate is 6.3923% to 4dp, and the payment at that rate is $2,500.01 — one cent over, because the rate is rounded.
Does the total repaid include taxes and insurance?
No — the total is principal and interest only. Property tax, homeowner's insurance, PMI and HOA fees are on top, and they vary by home and lender.
When will my mortgage be paid off?
October 2056 on the defaults — 360 months from October 2026. Add $200 a month and it is March 2051; add $500 and it is March 2046.