Detailed mortgage tool
Mortgage Amortization Schedule
Create a detailed mortgage amortization schedule with monthly payments, annual summaries, principal, interest, remaining balances, housing costs, and a local CSV export.
- No email required
- Calculates in your browser
- Editable assumptions
How to use: Replace the example values with the scenario you want to explore. Results update as you type. Open the detailed sections for assumptions, breakdowns, and schedules.
Privacy: Rich Direction does not connect your calculator entries to your email address by default. Calculator values are not used to create advertising audiences.
Questions this tool helps answer
Compare the result, cost, and tradeoffs.
- How much of each payment goes to principal and interest?
- What balance remains after a selected month or year?
- How do additional principal payments change cumulative interest and payoff timing?
Method
How the calculation works
Each payment applies interest to the beginning balance. The remainder of the scheduled payment reduces principal, followed by any additional principal. The final payment is shortened when needed.
Important definitions
Understand the result.
- Beginning balance
- The mortgage principal outstanding before the current payment.
- Cumulative interest
- Interest paid from payment one through the selected payment.
- Total housing outflow
- Loan payment, additional principal, property tax, insurance, PMI, and HOA dues for the period.
Important limitations
Verify material decisions.
The schedule assumes the entered rate, payment timing, and additional principal remain consistent. Actual lender statements may differ because of daily interest, escrow changes, fees, payment dates, or servicing practices.
Use the calculator as an educational comparison tool and confirm important figures with source documents, providers, lenders, taxing authorities, or qualified professionals as appropriate.