Mortgage Interest Calculator

Complete amortization schedule · Total interest paid · Loan payoff analysis

Smart Mortgage Analysis Tool
Loan Details
Loan Amount ($)
Interest Rate (%)
Loan Term (Years)
Start Date
Extra Monthly Payment ($)
Standard
With Extra
Shows total interest, principal breakdown, and complete amortization schedule
Interest Summary
Principal vs Interest
Key Metrics
Amortization Schedule
Total Interest Calculation
See exactly how much interest you'll pay over the life of your loan
Full Amortization
Complete payment schedule with principal and interest breakdown
Extra Payment Analysis
See how extra payments reduce total interest and payoff time

Frequently Asked Questions

What is mortgage interest?
Mortgage interest is the cost of borrowing money to buy a home. It's calculated as a percentage of your remaining loan balance and paid monthly along with your principal payment.
How is mortgage interest calculated?
Interest is calculated monthly based on your remaining balance. Each payment covers interest for that month plus some principal. Early payments are mostly interest; later payments are mostly principal.
How can I reduce total interest?
Make extra payments toward principal, choose a shorter loan term, secure a lower interest rate, or make bi-weekly payments instead of monthly.
What's the difference between APR and interest rate?
Interest rate is the cost of borrowing the principal. APR includes interest plus other costs like fees, giving you the true annual cost of the loan.
mortgage interest calculator amortization calculator home loan interest mortgage payment calculator loan interest calculator extra payment calculator

Mortgage Interest Calculator - Understand Your Loan Costs

Our Mortgage Interest Calculator helps you understand exactly how much interest you'll pay over the life of your home loan. See complete amortization schedules, principal vs interest breakdowns, and the impact of extra payments.

How it works: Enter your loan amount, interest rate, and term. The calculator shows your monthly payment, total interest paid, and a complete amortization schedule showing each payment's principal and interest portions.

Key features: Yearly and monthly amortization views, extra payment analysis, principal vs interest charts, export to CSV, and start date selection for accurate payoff dates.

Perfect for: Homebuyers understanding loan costs, homeowners planning extra payments, refinance analysis, and real estate professionals.