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Mortgage Calculator

Explore the monthly principal and interest installment of a home purchase in the currency of your choice. The down payment reduces the financed amount before the first month.

Educational use. Figures are estimates, not professional advice or offers. Check the actual terms.

Read the full use notice

These tools are for educational purposes. Their results are estimates that depend on the inputs and the assumptions stated in each calculator.

They do not constitute financial, tax or legal advice, personalized recommendations, offers or contractual terms. Check actual costs and contracts and consult a qualified financial professional before deciding.

To the extent permitted by applicable law, we are not responsible for losses or damage arising from decisions made solely on the basis of these estimates. This notice does not exclude or limit rights or liabilities that cannot legally be excluded or limited.

Perform a calculation

Format

Currency

The calculation is performed in this browser. The indicated maximums are limits of this tool in USD. Do not enter personal data.

Home price (USD)

From 0.01 USD to 1,000,000,000.00 USD. Use properly grouped thousands and maximum 2 decimals.

Down payment (USD)

Also called a premium or deposit. It must be 0 or more and less than the price.

Fixed nominal annual rate (% annual)

From 0 to 100%, with maximum two decimals; e.g. .99.

Planned term

Use years, months, or both. The sum must be between 1 and 600 months.

Years

Months

Additional payments (optional)

After the ordinary installment, the lump sum payment is applied and then the monthly payment, starting from month 1, limited to the balance.

Additional monthly payment (USD per month)

Empty or 0 if there will be no monthly payment.

One-time additional payment (USD once)

Empty or 0 if there will be no single payment.

Month of one-time payment (month)

Only if the single payment is positive; within the original term.

Summary

Your estimated installment will appear here

Enter price, down payment, rate, and term. Then calculate to see the loan and its payments.

A worked example in USD

Fixed editorial example in USD; the currency selector does not convert these figures.

Figures in 1,234.56 format. If the home costs 100,000.00 USD and you pay 20,000.00 USD initially, the loan starts at 80,000.00 USD. With a fixed nominal annual rate of 6 % and 30 years, the approximate ordinary installment is 479.64 USD. The first month's interest is 400.00 USD (80,000 × 0.06 ÷ 12); the remainder of that installment reduces principal. The final installment may be adjusted for currency precision.

How it is calculated

The price minus the down payment gives the principal. It is subtracted in minor currency units before amortizing; the down payment does not appear as a credit in the table.
The fixed nominal annual rate is divided by 12. Each monthly interest uses the balance at the beginning of the month; the installment is paid at the end.
The theoretical installment and each interest are rounded to the minor currency unit of the chosen currency. After the installment, the one-time extra and the monthly extra are applied, up to the available balance.
The total paid toward the loan is principal plus interest. Adding the down payment gives the modeled purchase and financing.

Estimation limits

This is an educational model, not an offer, quote, or contractual result. It does not include taxes, home insurance, closing costs, HOA, mortgage insurance, maintenance, or other property costs. The actual installment and total cost may be higher or follow different rules. Consult your lender's terms.