Reviewed by: David Chen, CFA
David Chen is a Certified Financial Analyst with over 10 years of experience in residential mortgage analytics and monthly-payment modelling.
David Chen is a Certified Financial Analyst with over 10 years of experience in residential mortgage analytics and monthly-payment modelling.
Use this free mortgage calculator per month to estimate your monthly principal & interest, total interest, and payoff date in seconds.
Mortgage Calculator Per Month
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Monthly Mortgage Formula
Monthly P&I: M = P × [ r(1+r)^n ] / [ (1+r)^n – 1 ]
Total Interest: (M × n) – P
Formula Sources: Investopedia | Bankrate
Variables
- P: Loan amount after down payment.
- r: Monthly interest rate (annual rate ÷ 12).
- n: Total monthly payments (years × 12).
Related Calculators
- Bi-Weekly Mortgage Calculator
- Mortgage Refinance Calculator
- Interest-Only Mortgage Calculator
- Mortgage Affordability Calculator
What Is a Mortgage Calculator Per Month?
It computes the exact monthly principal & interest (P&I) payment for any given loan size, term, and fixed rate. Additional fields for down payment percentage and home price let you see the full borrowing picture at a glance.
How to Calculate Monthly Payment (Example)
- Enter the home price (e.g., $400,000).
- Select your down-payment percentage (e.g., 10%).
- Choose the loan term (e.g., 30 years).
- Input the interest rate (e.g., 6.5%), then click “Calculate” for instant monthly P&I.
Frequently Asked Questions (FAQ)
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