How is monthly mortgage payment calculated?

This calculator uses the standard amortization formula based on loan amount, monthly interest rate, and total number of monthly payments.

Do extra payments reduce total interest?

Yes. Extra principal payments typically reduce the outstanding balance faster, lowering total interest and shortening payoff time.

Are these estimates guaranteed by lenders?

No. Results are planning estimates and may differ from lender disclosures due to fees, insurance, taxes, and specific loan terms.

Mortgage Calculator

Calculate monthly payment, total repayment, amortization progress, and extra payment savings using a standard mortgage amortization formula.

Mortgage Inputs

Live Mortgage Summary

Mortgage Dashboard

Results refresh instantly from your loan inputs.

Monthly Payment

$0.00

Total Interest

$0.00

Total Repayment

$0.00

Estimated Payoff Time

0 years 0 months

Amortization Summary

Principal Paid in Year 1

$0.00

Interest Paid in Year 1

$0.00

Balance After 5 Years

$0.00

Extra Payment Scenario

Interest Saved

$0.00

Repayment Time Saved

0 months

Payment Breakdown Chart

Amortization Balance Chart

Interest Rate Sensitivity Analysis

Compare how a 1% rate decrease or increase changes your monthly payment and total interest.

Interest Rate	Monthly Payment	Total Interest
Enter values to generate sensitivity analysis.

Example Mortgage Scenarios

Starter Home Scenario

Loan: $250,000 | Rate: 6.25% | Term: 30 years. Suitable for first-time affordability comparisons.

Move-Up Home Scenario

Loan: $450,000 | Rate: 6.75% | Term: 30 years with $200 extra monthly payment.

Short-Term Payoff Scenario

Loan: $320,000 | Rate: 5.9% | Term: 15 years to reduce lifetime interest burden.

Mortgage Planning Tips for Better Borrowing Decisions

Focus on both monthly affordability and long-term interest cost. Small rate changes can produce large repayment differences over multi-decade terms.

For a complete mortgage calculator with taxes and insurance, include your expected escrow components in your monthly budget planning scenario.

How to Use This Mortgage Calculator Effectively

Run base and extra-payment scenarios before choosing a loan term.
Use the sensitivity table to prepare for potential rate changes.
Track amortization balance to understand equity growth over time.

Common Mortgage FAQs

What formula is used for mortgage calculations?

The page uses the standard amortization formula for fixed-rate mortgages with monthly compounding and monthly payments.

Why does most of my early payment go to interest?

Interest is calculated on the current principal balance. Early in the loan, the balance is highest, so interest is a larger share.

Does making extra monthly payments always help?

In most fixed-rate loans, extra principal payments reduce interest cost and shorten payoff time, assuming no prepayment penalties.