How to calculate loan payments?
Our loan calculator helps you understand the true cost of borrowing. Here's how to use it:
- Enter the total loan amount (e.g., $300,000 for a mortgage, $25,000 for a car loan).
- Set the annual interest rate as a percentage (e.g., 6.5% for a mortgage, 3.9% for a car loan).
- Choose the loan term in years (e.g., 30 years for a mortgage, 5 years for a car loan).
- The calculator instantly shows your monthly payment, total interest paid, and total cost of the loan.
- Scroll down to see the full amortization schedule showing principal vs interest for each payment.
Understanding loan amortization
Loan amortization is the process of paying off a loan through regular payments over time. Each payment consists of two parts:
- Principal: The portion that goes toward reducing your original loan balance.
- Interest: The cost of borrowing, calculated on the remaining balance.
- Early in the loan term, a larger portion of each payment goes toward interest. Over time, more goes toward principal.
- This is called 'front-loaded' interest, which is why paying extra early can save you thousands in interest.
Factors that affect your loan payments
Three main factors determine your monthly loan payment: the loan amount (principal), the interest rate, and the loan term. A higher loan amount or interest rate increases your payment. A longer term reduces your monthly payment but increases the total interest paid over the life of the loan. For example, a $300,000 mortgage at 6.5% costs $1,896/month for 30 years (total interest: $382,634) but $2,431/month for 15 years (total interest: $137,663) — saving $244,971 in interest.
How to save money on loans
Several strategies can reduce the total cost of your loan: making extra payments toward principal, choosing a shorter loan term if you can afford the higher payments, shopping around for the best interest rate, improving your credit score before applying, and making a larger down payment. Even one extra payment per year can shave years off your mortgage and save tens of thousands in interest.
Frequently Asked Questions (FAQs)
How is my monthly payment calculated?
Monthly payments are calculated using the loan amortization formula: M = P × [r(1+r)^n] / [(1+r)^n - 1], where M is the monthly payment, P is the principal loan amount, r is the monthly interest rate (annual rate divided by 12), and n is the total number of payments (loan term in years × 12).
What is an amortization schedule?
An amortization schedule is a complete table showing each loan payment over time. It breaks down how much of each payment goes toward principal versus interest, and shows the remaining balance after each payment. This helps you understand how your loan balance decreases over time and how much interest you're paying at each stage.
What's the difference between a fixed-rate and adjustable-rate loan?
A fixed-rate loan has an interest rate that stays the same for the entire loan term, giving you predictable monthly payments. An adjustable-rate mortgage (ARM) has a rate that can change periodically based on market conditions. ARMs typically start with lower rates but carry the risk of future increases. Fixed-rate loans are more common for long-term borrowing like mortgages.
Should I choose a 15-year or 30-year mortgage?
A 30-year mortgage offers lower monthly payments but more total interest over the life of the loan. A 15-year mortgage has higher monthly payments but significantly less total interest. For example, on a $300,000 loan at 6.5%: 30-year = $1,896/month ($382,634 total interest), 15-year = $2,431/month ($137,663 total interest). Choose based on your budget and financial goals.
How can I pay off my loan faster?
Making extra payments toward principal is the most effective way to pay off a loan faster. Even small additional payments can make a big difference over time. Other strategies include: making bi-weekly payments (which results in one extra payment per year), rounding up your monthly payment, and applying any windfalls (bonuses, tax refunds) to your principal balance.
