// pre-computed reference
20-year mortgage at 8.0%: total interest by loan amount
Exact principal-and-interest figures for a fixed-rate 20-year mortgage at
8.0%, 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 | $836 | $100,746 | $200,746 | 101% |
| $200,000 | $1,673 | $201,491 | $401,491 | 101% |
| $300,000 | $2,509 | $302,237 | $602,237 | 101% |
| $400,000 | $3,346 | $402,983 | $802,983 | 101% |
| $500,000 | $4,182 | $503,728 | $1,003,728 | 101% |
At 8.0% over 20 years, every dollar borrowed costs about
101 cents in interest. The 20-year term is the overlooked compromise: most of a 15-year's savings with a noticeably gentler payment than the sprint terms.
See the term comparison or the
extra payment calculator to shrink these numbers.
20-year at other rates: 4.0% · 4.5% · 5.0% · 5.5% · 6.0% · 6.5% · 7.0% · 7.5%
8.0% at other terms: 10-year · 15-year · 25-year · 30-year
Frequently asked questions
How much interest on a $400,000 mortgage at 8.0% for 20 years?
Total interest is about $402,983, with a monthly principal-and-interest payment of $3,346. That's 101% of the amount borrowed, before taxes and insurance.
Is 8.0% a good rate for a 20-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 $402,983 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 20-year payment at 8.0% calculated?
With the standard amortization formula — P·r(1+r)ⁿ/((1+r)ⁿ−1) — over 240 monthly payments, computed to the cent. The full formula and rounding rules are on our methodology page.