How do I use the Mortgage Calculator?
Enter your values in the fields and the result updates instantly as you type.
Mortgage Calculator
Calculate monthly mortgage payments with optional down payment. Enter your values, review the formula, and use the worked result as a quick check for everyday planning.
Mortgage Calculator
Calculate monthly mortgage payments with optional down payment.
Total home price
Upfront payment
Annual mortgage rate
Amortization period
Results
Loan Amount
400,000 $
Monthly Payment
2,456.349969 $
Total Payment
736,904.990738 $
Total Interest
336,904.990738 $
Down Payment %
20 %
Formula: Monthly Payment = (P - D) * (r * (1+r)^n) / ((1+r)^n - 1)
Disclaimer: This calculator provides estimates for educational purposes. Actual mortgage rates, terms, insurance, property taxes, and closing costs vary by lender, province/state, and personal circumstances. Consult a mortgage broker or financial advisor for accurate quotes.
Mortgage Calculator: Plan Your Home Purchase
Estimate your monthly mortgage payment by entering the home price, down payment, interest rate, and loan term. This gives you a clear picture of what you will pay each month before taxes, insurance, and other costs.
Formula
The formula is Monthly Payment = L × (r(1+r)^n) / ((1+r)^n − 1). Here L is the loan amount (home price minus down payment), r is the monthly interest rate, and n is total monthly payments. The down payment percentage shows how much equity you start with.
Worked example
A 500,000 home with 100,000 down (20%) at 5.5% interest over 25 years produces a loan of 400,000, monthly payment of about 2,456, and total interest of roughly 336,940 over the life of the loan.
Practical guidance
Beyond the monthly payment
Your actual housing cost includes property taxes, homeowner insurance, private mortgage insurance (PMI) if your down payment is under 20%, HOA fees, and maintenance. Add roughly 30-40% to the monthly payment for a realistic total housing budget.
Down payment strategy
A larger down payment reduces the loan amount and may eliminate PMI. At 20% down, you avoid PMI entirely. At lower down payments, factor in the extra monthly cost. The calculator shows your down payment percentage so you can adjust.
Interest rate sensitivity
On a 400,000 mortgage over 25 years, the difference between 5% and 6% is about 230 per month. Even a 0.5% rate change can mean tens of thousands over the loan term. Use this calculator to stress-test different rate scenarios.
Frequently asked questions
What formula does this calculator use?
Monthly Payment = (P - D) * (r * (1+r)^n) / ((1+r)^n - 1)
Can I use decimal values?
Yes. Decimal inputs are supported for most calculators. Integer-based tools use rounded integer values where appropriate.
Is this calculator free?
Yes. CalcuNimble calculators are free and optimized for fast everyday use.