30 Yr Mortgage Calculator

Reviewed by: David Chen, CFA | Real Estate Finance Expert
Last Updated: October 2025

Calculate your monthly payments instantly with our 30 yr mortgage calculator. The 30-year fixed mortgage remains the most popular choice for homeowners, offering a stable, long-term repayment plan with manageable monthly obligations.

30 yr mortgage calculator

The total amount financed.
Annual fixed interest rate.
Standard term is 30 years.
Leave empty to calculate payment.
Estimated Monthly Payment
$0.00
Principal & Interest (30 Yr Term)

30 yr mortgage calculator Formula

We use the industry-standard amortization formula to determine your monthly principal and interest payments over a 360-month period.

M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
Source: Consumer Financial Protection Bureau (CFPB)

Variables

  • M: Monthly Payment.
  • P: Principal Loan Amount.
  • i: Monthly Interest Rate (Annual Rate / 12).
  • n: Number of Payments (30 Years x 12 = 360).

Related Calculators

What is a 30 yr mortgage calculator?

A 30 yr mortgage calculator is designed to help you plan for the most common home loan in America: the 30-year fixed-rate mortgage. By locking in an interest rate for three decades, homeowners enjoy predictable monthly payments that are generally lower than those of shorter-term loans like 15-year mortgages.

While the lower payment improves affordability, the longer term means you will pay more interest over the life of the loan. This tool helps you visualize that balance.

How to Calculate 30 yr mortgage calculator (Example)

  1. Enter Loan Amount: Input the total amount you are borrowing (e.g., $250,000).
  2. Input Interest Rate: Enter the current market rate (e.g., 6.8%).
  3. Verify Term: Ensure the term is set to 30 years (360 months).
  4. Review Result: The calculator computes the monthly payment needed to zero out the balance after exactly 30 years.

Frequently Asked Questions (FAQ)

Is a 30 yr mortgage better than a 15 yr mortgage?

It depends on your goals. A 30-year mortgage offers lower monthly payments, giving you more cash flow flexibility. A 15-year mortgage saves you significant money on interest but requires a higher monthly payment.

How much interest will I pay over 30 years?

It is common for the total interest paid over 30 years to equal or exceed the original loan amount. For a $300,000 loan at 7%, the total interest would be over $418,000.

Can I pay off a 30 yr mortgage early?

Yes. Most conventional loans do not have prepayment penalties. Adding just one extra payment per year can reduce your term by several years.

Does this calculator include taxes?

This specific tool calculates Principal and Interest (P&I). You should add property taxes and insurance to get your full monthly housing cost.

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