Loan Amortization Schedule Calculator
Principal vs. interest breakdown at any point in a loan.
Enter your values
Enter the loan amount in $.
Enter the interest rate in % APR.
Enter the loan term in years.
Enter the payment number to inspect you are working with.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Monthly payment
- $2,155.01
- Interest in payment #60
- $1,703.81
- Principal in payment #60
- $451.20
- Balance after payment #60
- $326,680.35
- Total interest over full loan
- $425,803.67
Quick answer
Early payments on an amortizing loan are mostly interest; the principal share grows every month as the balance shrinks.
Interest = balance x monthly rate; Principal = payment - interest
At a glance
| What it does | Principal vs. interest breakdown at any point in a loan. |
|---|---|
| Category | Finance |
| Inputs needed | Loan amount, Interest rate, Loan term, Payment number to inspect |
| Main output | Monthly payment |
| Formula | Interest = balance x monthly rate; Principal = payment - interest |
| Cost | Free — no sign-up, no download |
How to use the Loan Amortization Schedule Calculator
- 1Enter the loan amount, rate and term.
- 2Choose the payment number you want to inspect.
- 3See exactly how much of that payment is interest vs. principal.
Inputs explained
- Loan amount($)
- Enter the loan amount in $.
- Interest rate(% APR)
- Enter the interest rate in % APR.
- Loan term(years)
- Enter the loan term in years.
- Payment number to inspect
- Enter the payment number to inspect you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Loan amount350000 $
- Interest rate6.25 % APR
- Loan term30 years
- Payment number to inspect60
Results
- Monthly payment$2,155.01
- Interest in payment #60$1,703.81
- Principal in payment #60$451.20
- Balance after payment #60$326,680.35
- Total interest over full loan$425,803.67
Frequently asked questions
Why is so little principal paid early on?
Interest is charged on the full remaining balance, which is highest at the start of the loan.
When does principal overtake interest?
Roughly halfway through most 30-year loans at typical rates, though it depends on the rate.
What do I need to enter into the Loan Amortization Schedule Calculator?
Just 4 values: loan amount, interest rate, loan term, payment number to inspect. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Loan Amortization Schedule Calculator work out the answer?
Early payments on an amortizing loan are mostly interest; the principal share grows every month as the balance shrinks. It applies the formula Interest = balance x monthly rate; Principal = payment - interest and shows the working so you can check each step by hand.
Is the Loan Amortization Schedule Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.