Your Mortgage Summary
You pay — as interest to borrow —.
- Home Price
- —
- Down Payment
- —
- Loan Term
- —
- Interest Rate (Annual)
- —
- Property Tax / Month
- —
- Home Insurance / Month
- —
- Mortgage Insurance / Month
- —
- HOA / Other / Month
- —
You will pay — per month for principal and interest.
Including the recurring costs you entered, your estimated housing cost is — per month.
Out of the modeled repayment, — is interest.
You are financing — after your down payment.
Each payment covers interest and principal. As the balance decreases, the interest share generally falls and more of the payment goes toward principal.
Finance calculations are estimates based on the values and assumptions you enter. They are not financial, tax, lending or investment advice. Verify the terms, rates, fees and local rules that apply to your situation.
About this tool
Mortgage Calculator
Estimate principal, interest, recurring housing costs and extra-payment scenarios for a home loan. Model the effect of home price, down payment, rate, term, property costs and additional principal payments before comparing an actual mortgage offer.
What This Mortgage Calculator Does
Estimate principal-and-interest payments and explore how housing costs and extra payments can change the cost of borrowing.
Inputs and What They Mean
Enter the home price, down payment, annual interest rate and loan term. Optional fields let you model annual property tax, insurance, mortgage insurance, HOA or other recurring housing costs, plus an extra monthly payment.
How the Calculation Works
The core payment uses the standard fixed-rate amortizing-loan formula. The calculator separates principal and interest from recurring housing costs so you can see which part of a monthly budget comes from the loan itself and which part comes from other assumptions.
How to Use the Calculator
- Enter the values that describe your situation.
- Check the units, frequency and assumptions shown beside each field.
- Choose any available mode or calculation target before calculating.
- Select Calculate and review the result card.
- Change one assumption at a time when comparing scenarios.
How to Interpret the Result
Review the estimated principal-and-interest payment first, then compare the total monthly housing estimate, total interest and the effect of extra payments. An extra payment can reduce the outstanding balance faster and therefore reduce future interest, but actual lender rules may vary.
Important Assumptions and Limitations
Mortgage products, taxes, insurance, fees and lending conventions vary by country and lender. Tervilo's calculation is a planning model, not a quote or country-specific lending decision.
Practical Planning Tip
Use the calculator as a scenario-testing tool. Save or compare a conservative case, a base case and a more optimistic case instead of relying on a single projection. For financial decisions, verify rates, fees, taxes, contractual terms and local rules with the relevant provider or official source.
Questions & Answers
Frequently Asked Questions
Does the mortgage calculator include taxes and insurance?
No. It estimates principal and interest. Property taxes, insurance, mortgage insurance and fees can be added separately depending on the jurisdiction and loan.
Does the mortgage calculator include housing costs?
Yes. It can model property tax, insurance, mortgage insurance and other annual housing costs in addition to principal and interest.