Mortgage Calculator
Use our free online Mortgage Calculator to perform fast, accurate calculations with instant formulas, step-by-step arithmetic, and verified reference benchmarks.
Interactive Mortgage Calculator
How to Calculate: The Mortgage Calculator Formula
Where M is total monthly payment, P is the principal loan amount, r is the monthly interest rate (annual interest rate divided by 12 months), and n is the total number of monthly payments.
Step-by-Step Calculation Guide
- Enter the purchase price of the property and your total down payment.
- Subtract down payment from purchase price to establish the initial loan principal (P).
- Divide your annual interest rate by 12 to get the monthly interest rate (r).
- Multiply loan term in years by 12 to determine total payments (n).
- Apply the amortization formula to calculate fixed monthly principal and interest.
Practical Mortgage Calculator Examples
Home Price: $400,000, Down Payment: $80,000 (20%), Loan: $320,000 at 6.5% interest.
Home Price: $400,000, Down Payment: $80,000 (20%), Loan: $320,000 at 5.75% interest.
15-Year vs 30-Year Fixed Mortgage Comparison ($300k Loan)
Official reference values and benchmark classifications based on standard institutional guidelines.
| Loan Term | Interest Rate | Monthly Payment | Total Interest | Total Paid |
|---|---|---|---|---|
| 15 Years | 5.75% | $2,492 | $148,514 | $448,514 |
| 20 Years | 6.10% | $2,167 | $220,094 | $520,094 |
| 30 Years | 6.50% | $1,896 | $382,633 | $682,633 |
Frequently Asked Questions about Mortgage Calculator
What is included in PITI mortgage payments?
PITI stands for Principal, Interest, real estate property Taxes, and homeowners Insurance. It represents your complete monthly housing expense.
How does down payment size affect mortgage cost?
Putting down at least 20% eliminates costly Private Mortgage Insurance (PMI), reduces your monthly principal and interest, and secures lower interest rates.
Can you pay off a 30-year mortgage early?
Yes. Making one extra monthly payment per year or adding extra principal payments each month can cut 5 to 8 years off a 30-year mortgage.
What credit score is needed for a conventional mortgage?
Most conventional lenders require a minimum FICO credit score of 620, while prime interest rates typically require 740 or higher.