Mortgage Amortization Calculator — See Where Every Dollar Goes
See your monthly mortgage payment broken down between principal and interest, year over year. Understand exactly how front-loaded your interest payments are.
On a $360,000 loan at 6.72% over 30 years, you pay $478,000 in interest — $24,192 in year 1 alone.
In the early years, most of your payment goes to interest. Extra principal payments early in the loan have an outsized impact on total cost. Even $100/month extra can save tens of thousands.
Compare mortgage ratesCoach Insight
In year 1 of a 30-year mortgage at 6.74%, roughly 90% of every payment goes to interest. By year 10 it drops to about 75%. By year 20 it is closer to 40%. Seeing this curve in numbers is the single fastest way to understand why making extra principal payments early matters so much — and why refinancing a 30-year that's 15 years in often does not save much.
Advertising disclosure: SwitchWize may earn a referral fee if you open an account through a link above. This does not affect our rankings. Learn more
Frequently Asked Questions
Everything you need to know.
Related Calculators
Why This Matters
In year 1 of a 30-year mortgage at 6.74%, roughly 90% of every payment goes to interest. By year 10 it drops to about 75%. By year 20 it is closer to 40%. Seeing this curve in numbers is the single fastest way to understand why making extra principal payments early matters so much — and why refinancing a 30-year that's 15 years in often does not save much.
How to Use It
- 1Enter your loan amount
- 2Enter your interest rate (APR)
- 3Pick your loan term (15, 20, 25, or 30 years)
- 4See the monthly payment, total interest, year-1 vs year-10 interest, and balance milestones at 1/5/10 years
Find the best account for this goal
Money Map matches your numbers to the strongest available accounts in 90 seconds.
Ready to take the next step?
Compare rates, run Money Map, or explore the full SwitchWize toolkit.