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Mortgage Calculator

Calculate monthly mortgage payments, total interest paid, and full amortisation schedule — with options for down payment, loan term, and extra monthly payments.

✓ Free✓ No signup✓ Privacy first✓ Runs in your browser
Mortgage Calculator – ToolPremier
$400,000
20%
$
6.5%
%
%/yr
$/yr
/mo
$2,022
Estimated Monthly Payment
P & I $0
Property Taxes $0
Home Insurance $0
PMI & HOA $0
Year Starting Bal Principal Paid Interest Paid Ending Bal

Mortgage Calculator · client-side only · A4 amortization · dynamic breakdown

How it works
Convert in three steps

Enter property and loan details

Input the home price, down payment amount (or percentage), annual interest rate, and loan term (typically 10, 15, 20, or 30 years).

See the breakdown

Monthly payment, total amount paid over the full term, total interest cost, and the loan-to-value (LTV) ratio.

Explore prepayment scenarios

Add an extra monthly payment amount to see how it shortens the loan term and reduces total interest.

FAQ
Common questions

This calculator computes the principal and interest (P&I) component of a mortgage payment — the core repayment. It does not include property taxes, homeowner’s insurance, or PMI (private mortgage insurance for loans with under 20% down), as these vary widely by location and lender. Your actual monthly outgoing will be higher than the P&I figure when these costs are included.

LTV is the ratio of the loan amount to the property’s value (loan ÷ property price × 100). A lower LTV indicates less risk for the lender and typically qualifies for better interest rates. Most lenders require PMI for LTVs above 80% — paying 20% or more down avoids this cost.

A 30-year mortgage has a lower monthly payment but you pay significantly more total interest — often more than the original loan amount over the full term. A 15-year mortgage has higher monthly payments but a much lower total interest cost. The calculator shows the total interest for any term, making this comparison straightforward.

No. All calculations run in your browser. No financial details are transmitted.

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About the Mortgage Calculator

A mortgage is typically the largest single financial commitment in a person’s life, yet most buyers focus on the monthly payment without fully understanding the total cost over the loan term. This calculator shows both: your monthly principal and interest payment, and the total amount you’ll pay over the life of the loan — which is often eye-opening when the interest cost over 30 years is laid out explicitly. The prepayment scenario feature shows how even a modest extra monthly payment meaningfully shortens the loan term and reduces total interest, giving a concrete picture of the value of paying down a mortgage faster.

Benefits
  • P&I payment calculation — standard reducing-balance mortgage formula.
  • Full amortisation schedule — month-by-month balance breakdown.
  • LTV ratio display — see your down payment’s effect on loan risk tier.
  • Prepayment scenario — model extra monthly payments and see term reduction.
Privacy

All calculations run in your browser. No financial details are transmitted to any server.