What is an amortization schedule?

An amortization schedule is a complete table of loan payments showing how much of each payment goes toward principal and interest over the life of the loan. Early payments are mostly interest; later payments shift toward principal.

How is the monthly payment calculated?

Monthly payment = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the loan amount, r is the monthly interest rate, and n is the total number of payments.

How can I pay off my loan faster?

Making extra payments toward principal reduces the balance faster, shortening the loan term and saving interest. Even small additional monthly payments can save thousands over a 30-year mortgage.

What is the difference between principal and interest in a payment?

Each payment covers interest first (calculated on the remaining balance), then the rest reduces the principal. As the balance falls, more of each payment goes to principal — this is the amortization effect.

Does making extra payments change the amortization schedule?

Yes. Extra principal payments reduce the outstanding balance immediately, meaning future interest charges are lower. This shortens the total loan term and reduces overall interest paid.

📋 Amortization Calculator

Create detailed loan payment schedules showing exactly how much principal and interest you pay each month.

Understanding Amortization

📈 Payment Breakdown

Each payment contains both principal and interest. Early payments are mostly interest, while later payments are mostly principal.

📊 Schedule Benefits

See exactly when you'll pay off your loan, how much interest you'll pay each year, and how extra payments can save money.

💰 Interest Savings

Use the schedule to identify the best times to make extra principal payments for maximum interest savings.

When to Use This Calculator

Use this when you have an existing loan and want to see exactly how much of each payment goes to principal vs interest. It helps you understand the total interest cost over the loan life and evaluate the impact of making extra payments.

Common Mistakes to Avoid

Ignoring extra payment impact — even $50/month extra can save thousands in interest and years off the loan.
Confusing APR with interest rate — use the stated interest rate (not APR) in the amortization formula.
Not recalculating after refinancing — your old amortization schedule becomes invalid after a rate change.