// pre-computed reference
15-year mortgage at 4.0%: total interest by loan amount
Exact principal-and-interest figures for a fixed-rate 15-year mortgage at
4.0%, computed with the standard amortization formula. For your own numbers, use the
interactive calculator.
| Loan amount | Monthly P&I | Total interest |
Total paid | Interest % of loan |
|---|
| $100,000 | $740 | $33,144 | $133,144 | 33% |
| $200,000 | $1,479 | $66,287 | $266,287 | 33% |
| $300,000 | $2,219 | $99,432 | $399,432 | 33% |
| $400,000 | $2,959 | $132,576 | $532,576 | 33% |
| $500,000 | $3,698 | $165,719 | $665,719 | 33% |
At 4.0% over 15 years, every dollar borrowed costs about
33 cents in interest. A 15-year term reaches the principal-over-interest crossover early, which is why its totals run far below a 30-year loan at the same rate.
See the term comparison or the
extra payment calculator to shrink these numbers.
15-year at other rates: 4.5% · 5.0% · 5.5% · 6.0% · 6.5% · 7.0% · 7.5% · 8.0%
4.0% at other terms: 10-year · 20-year · 25-year · 30-year
Frequently asked questions
How much interest on a $400,000 mortgage at 4.0% for 15 years?
Total interest is about $132,576, with a monthly principal-and-interest payment of $2,959. That's 33% of the amount borrowed, before taxes and insurance.
Is 4.0% a good rate for a 15-year mortgage?
Rates move with the market and your credit profile; compare current quotes from several lenders. Whatever your rate, the table above shows what it costs in total interest.
How can I pay less than $132,576 in interest?
Pay extra toward principal, choose a shorter term, or refinance if rates drop. Use the extra payment calculator to see your exact savings.
How is the 15-year payment at 4.0% calculated?
With the standard amortization formula — P·r(1+r)ⁿ/((1+r)ⁿ−1) — over 180 monthly payments, computed to the cent. The full formula and rounding rules are on our methodology page.