Mortgage Calculator

Romik Amreliya

Estimate your monthly mortgage payments, total interest, and overall cost of your home loan.

Home Price

Down Payment

Down Payment %

Interest Rate (% / year)

Loan Term (Years)

What is a Mortgage Calculator?

A mortgage calculator helps you estimate your monthly home loan payments based on the home price, down payment, interest rate, and loan term. It gives you a clear picture of your financial commitment before you buy a home.

Understanding your monthly mortgage payment helps you plan your budget, compare different loan offers, and decide how much house you can afford.

Mortgage Payment Formula

M = P × [r(1+r)ⁿ] / [(1+r)ⁿ – 1]

M = Monthly payment · P = Loan principal · r = Monthly interest rate · n = Total number of payments

The formula calculates the fixed monthly payment needed to fully amortize (pay off) a loan over a set period. The monthly interest rate is the annual rate divided by 12, and the total payments is the loan term in years multiplied by 12.

How to Calculate Your Mortgage

Enter the home price — the total purchase price of the property.
Enter your down payment amount or percentage (typically 10-20%).
Enter the annual interest rate offered by your lender.
Enter the loan term in years (common terms: 15, 20, or 30 years).
Your monthly payment, total interest, and total cost are calculated instantly.

Mortgage Calculation Formula

M = P [ i(1 + i)^n ] / [ (1 + i)^n - 1 ]

M = Total Monthly Payment · P = Principal Loan Amount · i = Monthly Interest Rate · n = Number of Payments (Months)

Real-World Example

Example: Buying a ₹50,00,000 Home

Home Price: ₹50,00,000

Down Payment: ₹10,00,000 (20%)

Loan Amount: ₹40,00,000

Interest Rate: 8.5% per year

Loan Term: 20 years

Monthly Payment: ≈ ₹34,713

Total Interest: ≈ ₹43,31,191

Interpretation of Results

A mortgage payment is often your largest monthly expense. When evaluating your results, financial experts recommend the 28/36 Rule: your total housing costs (mortgage, taxes, insurance) should not exceed 28% of your gross monthly income, and your total debt should not exceed 36%. Use these calculation results to ensure your new home fits comfortably within your budget.

Tips for First-Time Home Buyers

Save for a larger down payment — a 20% down payment can help you avoid private mortgage insurance (PMI) and reduce monthly payments.
Compare lender rates — even a 0.5% difference in interest rate can save you lakhs over the life of the loan.
Consider the loan term — shorter terms (15 years) have higher monthly payments but significantly less total interest.
Factor in additional costs — property taxes, insurance, maintenance, and HOA fees are not included in the mortgage payment.
Check your credit score — a higher credit score typically qualifies you for better interest rates.

Frequently Asked Questions

A basic mortgage payment includes principal and interest (P&I). Your total housing payment may also include property taxes, homeowner's insurance, and private mortgage insurance (PMI) — often called PITI.

While 20% is ideal to avoid PMI, many loan programs allow 5-10% down. FHA loans may accept as low as 3.5%. A higher down payment reduces your monthly payment and total interest.

A 15-year mortgage has higher monthly payments but lower interest rates and significantly less total interest paid. A 30-year mortgage offers lower monthly payments but costs more in interest over time.

Even small changes in interest rate significantly impact your payment. On a ₹40,00,000 loan over 20 years, a rate increase from 8% to 8.5% adds approximately ₹1,200 to your monthly payment.

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Written & Reviewed by Romik Amreliya

Software Engineer & Data Analyst. Dedicated to building precise, privacy-first web calculators based on standardized financial and medical algorithms. All tools and content undergo rigorous testing against industry-standard benchmarks.

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Sources & References:

Investopedia - Financial education, formulas, and terminology definitions.
Standard banking amortization formulas for compound interest and loan schedules.
Consumer Financial Protection Bureau (CFPB) - Guidelines on credit cards, mortgages, and personal loans.
Calculations are based on universally accepted financial mathematics; actual rates may vary by institution.

Financial Disclaimer: This mortgage calculator is provided for educational and informational purposes only. The results are estimates and do not constitute professional financial advice. Actual mortgage terms, interest rates, and payments may vary based on your lender, credit score, and other fees. Always consult with a qualified financial advisor or your lending institution before making financial decisions.