Loan Amortization Calculator (USA)
Calculate your loan payments and see how your balance decreases over time with our detailed amortization schedule.
How to Calculate Loan Amortization
The monthly payment formula is:
Where:
- M = Monthly payment
- P = Principal loan amount
- r = Monthly interest rate (annual rate ÷ 12)
- n = Number of payments (loan term in years × 12)
Calculator : Loan Amortization
Visual Breakdown
Payment Distribution
Amortization Schedule (First 12 Payments)
| Month | Payment | Principal | Interest | Remaining Balance |
|---|
Analysis & Recommendations
Your loan has a 48.3% interest component compared to principal.
- Consider making extra payments early in the loan term to reduce total interest
- A shorter loan term could save significant interest costs
- Refinancing might be beneficial if rates drop significantly
- Make sure your monthly payment fits comfortably within your budget
Q&A
Q: Why does most of my early mortgage payment go toward interest instead of principal?
A: This occurs because mortgage loans use an amortization schedule that front-loads interest payments. Here's how it works:
Interest Calculation:
- Interest is calculated on the outstanding principal balance each month
- At the beginning of the loan, your principal balance is highest
- So, even though your payment is fixed, more of it goes toward interest initially
- As you pay down principal, the interest portion decreases
Example: On a $200,000 loan at 5.5% interest, the first payment has about $917 in interest vs. $157 in principal. By year 20, the same payment has about $472 in interest vs. $602 in principal.
This is standard across all amortizing loans and helps lenders recover their interest earnings early in the loan term.
Q: How much can I save by refinancing to a lower rate?
A: Refinancing savings depend on several factors:
Key Variables:
- Rate Difference: Even a 0.5% reduction can save thousands over the loan term
- Remaining Term: More savings with longer remaining terms
- Loan Balance: Higher balances yield greater absolute savings
- Closing Costs: Must be weighed against potential savings
Rule of Thumb: Refinance if you can get a rate at least 0.5-1% lower than your current rate, and you plan to stay in the home long enough to recoup closing costs (typically 2-3 years).
Example: On a $300,000 loan at 6% vs 5%, you'd save about $180/month, or $65,000 over 30 years - minus closing costs.