How the Loan Balance Calculator works
On an amortized loan, your original payment is fixed, but the mix of principal and interest inside each payment shifts every month. This calculator rebuilds your full original amortization schedule and reads off the balance at the exact month you specify, so you can see where you stand today without pulling up a statement.
It also separates out how much of your payments so far went to principal versus interest — useful for understanding how much progress you've actually made against the loan.
applied month by month, starting from the original loan amount
If you've made any extra payments beyond your regular schedule, your real balance will be lower than this estimate — see our Extra Payment Loan Calculator to model that case.
A worked example
You took a $20,000 loan at 6% over 5 years (payment $386.66) and have made 24 payments. Your remaining balance is about $12,709.78 — you have paid down roughly $7,290 of principal, even though you have handed over $9,280 in payments so far.
| Payments made | Principal paid | Remaining balance |
|---|---|---|
| 12 | $3,553 | $16,447 |
| 24 | $7,290 | $12,710 |
| 36 | $11,224 | $8,776 |
How to read your results
Remaining balance (also called the payoff amount) is what you would owe to close the loan today, before any early-payoff discount for unearned interest. Principal paid is the gap between the original amount and today's balance — it is always less than the total of the payments you have made, because part of every payment was interest.
When to use this calculator
Use it when you are thinking about selling a financed car, refinancing, or making a lump-sum payoff and need to know the number without waiting for a lender statement. It is also a quick way to check that your lender's reported balance looks right.
Common mistakes to avoid
- Subtracting total payments from the loan amount. That overstates how much principal you have retired, because it ignores interest.
- Forgetting missed or partial payments. The estimate assumes every scheduled payment was made in full and on time.
- Treating the estimate as an official payoff quote. Your lender's figure may include a few days of accrued interest or a small fee.