Amortization Calculator
View the principal and interest breakdown for every loan payment.
Build an amortization schedule with extra principal repayments.
Result
- Principal
- Interest
Calculation details
Scroll horizontally or vertically to see more. Download CSV for the complete schedule.
| Month | Date | Payment | Interest | Principal | Balance |
|---|---|---|---|---|---|
| 1 | 2026-10 | 1,110.21 | 500 | 610.21 | 99,389.79 |
| 2 | 2026-11 | 1,110.21 | 496.95 | 613.26 | 98,776.54 |
| 3 | 2026-12 | 1,110.21 | 493.88 | 616.32 | 98,160.22 |
| 4 | 2027-01 | 1,110.21 | 490.80 | 619.40 | 97,540.81 |
| 5 | 2027-02 | 1,110.21 | 487.70 | 622.50 | 96,918.31 |
| 6 | 2027-03 | 1,110.21 | 484.59 | 625.61 | 96,292.70 |
| 7 | 2027-04 | 1,110.21 | 481.46 | 628.74 | 95,663.96 |
| 8 | 2027-05 | 1,110.21 | 478.32 | 631.89 | 95,032.07 |
| 9 | 2027-06 | 1,110.21 | 475.16 | 635.04 | 94,397.03 |
| 10 | 2027-07 | 1,110.21 | 471.99 | 638.22 | 93,758.81 |
| 11 | 2027-08 | 1,110.21 | 468.79 | 641.41 | 93,117.40 |
| 12 | 2027-09 | 1,110.21 | 465.59 | 644.62 | 92,472.78 |
| 13 | 2027-10 | 1,110.21 | 462.36 | 647.84 | 91,824.94 |
| 14 | 2027-11 | 1,110.21 | 459.12 | 651.08 | 91,173.86 |
| 15 | 2027-12 | 1,110.21 | 455.87 | 654.34 | 90,519.52 |
| 16 | 2028-01 | 1,110.21 | 452.60 | 657.61 | 89,861.91 |
| 17 | 2028-02 | 1,110.21 | 449.31 | 660.90 | 89,201.02 |
| 18 | 2028-03 | 1,110.21 | 446.01 | 664.20 | 88,536.82 |
| 19 | 2028-04 | 1,110.21 | 442.68 | 667.52 | 87,869.30 |
| 20 | 2028-05 | 1,110.21 | 439.35 | 670.86 | 87,198.44 |
| 21 | 2028-06 | 1,110.21 | 435.99 | 674.21 | 86,524.23 |
| 22 | 2028-07 | 1,110.21 | 432.62 | 677.58 | 85,846.64 |
| 23 | 2028-08 | 1,110.21 | 429.23 | 680.97 | 85,165.67 |
| 24 | 2028-09 | 1,110.21 | 425.83 | 684.38 | 84,481.29 |
| 25 | 2028-10 | 1,110.21 | 422.41 | 687.80 | 83,793.49 |
| 26 | 2028-11 | 1,110.21 | 418.97 | 691.24 | 83,102.26 |
| 27 | 2028-12 | 1,110.21 | 415.51 | 694.69 | 82,407.56 |
| 28 | 2029-01 | 1,110.21 | 412.04 | 698.17 | 81,709.40 |
| 29 | 2029-02 | 1,110.21 | 408.55 | 701.66 | 81,007.74 |
| 30 | 2029-03 | 1,110.21 | 405.04 | 705.17 | 80,302.57 |
| 31 | 2029-04 | 1,110.21 | 401.51 | 708.69 | 79,593.88 |
| 32 | 2029-05 | 1,110.21 | 397.97 | 712.24 | 78,881.64 |
| 33 | 2029-06 | 1,110.21 | 394.41 | 715.80 | 78,165.85 |
| 34 | 2029-07 | 1,110.21 | 390.83 | 719.38 | 77,446.47 |
| 35 | 2029-08 | 1,110.21 | 387.23 | 722.97 | 76,723.50 |
| 36 | 2029-09 | 1,110.21 | 383.62 | 726.59 | 75,996.91 |
How to use this calculator
Build an amortization schedule with extra principal repayments. Enter amounts in the units shown, select the applicable options, and click Calculate. Use Reset to restore the starting values.
Calculation formula
Interest = opening balance × monthly rate; principal = payment − interest.
Assumptions and accuracy
Review timing, rates, fees and result notes when comparing scenarios. Future returns and rates are assumptions rather than guaranteed outcomes. Monetary display follows the currency’s precision; intermediate calculations retain additional digits.
Choose what to calculate
Mortgage amortization calculator
Build a period-by-period schedule showing interest, principal and the remaining balance after extra payments.
Related searches: Amortization calculator with extra payments · Loan amortization calculator
Open this calculationUnderstanding this calculation
A loan amortization schedule separates each installment into interest and principal. Read the opening balance, interest charge and remaining balance together to understand why principal repayment usually accelerates over time.
Worked examples
Zero-interest amortization over 12 months
Illustrative inputs are specified in the steps below; the example link loads the complete settings. Unmentioned settings use the linked defaults.
- Divide the 12,000 principal into 12 equal payments; 12,000 / 12 = 1,000.
Payment per period: 1,000 USD.
Try these inputsMonthly repayment with a 12% nominal annual rate
Principal 12,000 USD; 12 monthly payments; 12% nominal annual rate with monthly compounding. Fees and taxes are zero in this scenario.
- Monthly rate = 12% / 12 = 1%.
- Payment = 12000 × 0.01 / (1 − 1.01^(−12)).
- Check both the installment and the schedule; the final installment may be limited to the remaining balance.
Payment per period: 1066.19 USD.
Try these inputsCommon questions
How do extra payments affect an amortization schedule?
An extra principal payment lowers the balance used for subsequent interest. Check the payment date and extra-payment frequency rather than subtracting the amount from total interest directly.
Why does the last loan payment differ?
The final installment is limited to the remaining principal and interest, so it can be smaller than a regular payment.
How do I use an amortization calculator with extra payments?
Enter the original loan terms and optional monthly, yearly or one-time extra principal. Review the remaining balance and interest in the resulting schedule; the final payment is capped.
Scope and assumptions
Fixed-rate installments and entered extra payments are modeled; lender day-count rules and servicing practices can differ.
Sources
- Calculation methodology, rule versions and testing limitations
- Reference calculator for feature comparison (not a model-parity certification)
Calculation notes checked . Examples are mathematical checks under the stated assumptions.
Calculation methods and formulas
Amortization Schedule
Build an amortization schedule with extra principal repayments.
Interest = opening balance × monthly rate; principal = payment − interest.
See our calculation methodology and review status for data versions, rounding and validation limitations.