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Mortgage Interest Calculator

Written by Calcida Team
Reviewed for accuracy and clarity
Last updated: April 2026

Estimate your mortgage payment, total interest paid, and total loan cost based on rate and term.

This calculator is useful for borrowers estimating monthly payments and total interest on a fixed-rate loan You will typically enter Loan amount, Interest rate, Loan term.

The result represents monthly payment, total interest, and total cost If you are browsing similar tools, start with Mortgage Calculators or view the full calculators directory.

Also useful: Mortgage Payment Calculator with Taxes and Insurance, Mortgage Amortization Calculator & Schedule.

Mortgage Interest Details

Estimated Monthly Payment

$489
Total Interest$4,349
Total Cost$29,349

First Payment Breakdown

Payment
$489
Interest
$135
Principal
$354

What should you do next?

After calculating your mortgage, explore these related tools:

Budget Calculator →
Debt-to-Income RatioNet Worth Tracker

How This Calculator Works

This calculator estimates results using standard financial math based on the inputs you provide. It is designed for quick comparisons so you can understand how key variables affect the outcome.

  • Enter realistic inputs (amounts, rates, and time periods).
  • Review the computed result and any breakdown shown in the tool.
  • Adjust home price, down payment, and loan term to see how monthly payments and total interest change.

For related tools and deeper comparisons, browse Mortgage Calculators.

Formula

M = P × [ i(1 + i)^n ] / [ (1 + i)^n − 1 ]
Where:
  • M = monthly payment
  • P = principal (loan amount)
  • i = monthly interest rate (annual / 12)
  • n = number of monthly payments
Total Interest ≈ (M × n) − P.

Example Calculation

Loan amount$25,000
Rate6.50%
Term5 years
Estimated monthly payment
≈ $489

Tips for Better Estimates

  • Use the best available rate (quote, current APR, or a conservative assumption).
  • Model multiple scenarios by changing one input at a time.
  • Include fees, taxes, and deductions when they materially affect the total.
  • Compare alternatives using the calculators directory or the related calculators section.

Explore Related Tools

Continue with Mortgage Calculators to compare similar calculators and validate your assumptions across different scenarios.

Frequently Asked Questions

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