A $750,000 fixed-rate mortgage at 4.5% APR paid over 20 years costs $4,744.87 per month. Over the life of the loan you would pay $388,769 in interest — 52% of the amount borrowed.
The 4.5% rate on this page is 1.93 points below this week's national average of 6.43% for a 30-year fixed mortgage (Freddie Mac PMMS, July 2, 2026).
| Period | Principal paid | Interest paid | Balance |
|---|
| Scenario | Monthly | Total interest |
|---|---|---|
| $750,000 at 4% (20yr) | $4,544.85 | $340,765 |
| $750,000 at 4.25% (20yr) | $4,644.26 | $364,622 |
| $750,000 at 4.5% (20yr) ← this page | $4,744.87 | $388,769 |
| $750,000 at 4.75% (20yr) | $4,846.68 | $413,203 |
| $750,000 at 5% (20yr) | $4,949.67 | $437,920 |
| $750,000 at 5.25% (20yr) | $5,053.83 | $462,919 |
| $750,000 at 5.5% (20yr) | $5,159.15 | $488,197 |
| $750,000 at 5.75% (20yr) | $5,265.63 | $513,750 |
| $750,000 at 6% (20yr) | $5,373.23 | $539,576 |
| $750,000 at 6.25% (20yr) | $5,481.96 | $565,671 |
| $750,000 at 6.5% (20yr) | $5,591.80 | $592,032 |
| $750,000 at 6.75% (20yr) | $5,702.73 | $618,655 |
| $750,000 at 7% (20yr) | $5,814.74 | $645,538 |
| $750,000 at 7.25% (20yr) | $5,927.82 | $672,677 |
| $750,000 at 7.5% (20yr) | $6,041.95 | $700,068 |
| $750,000 at 7.75% (20yr) | $6,157.11 | $727,707 |
| $750,000 at 8% (20yr) | $6,273.30 | $755,592 |
| $750,000 at 8.5% (20yr) | $6,508.67 | $812,082 |
| $750,000 at 9% (20yr) | $6,747.94 | $869,507 |