Existing Loan Calculator
Use this calculator to analyze one of your existing loans. Calculate your remaining balance based on the number of monthly payments you have remaining.
How the existing loan calculator works
It rebuilds the full amortization schedule from your loan’s original terms, then reads off the row matching the number of payments you have made — giving your current balance, the principal and interest paid so far, and the interest still ahead.
Worked example: with original loan amount of $200,000, interest rate of 6.00% and original term (years) of 30, the existing loan calculator shows current balance of $186,109.
- Principal paid so far
- $13,891
- Interest paid so far
- $58,055
- Remaining balance
- $186,109
- Interest still to pay
- $173,622
The formula
The schedule is generated with Payment = P × r ÷ (1 − (1 + r)⁻ⁿ); your current balance is the scheduled balance after the payments you have made.
Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender, plan administrator or advisor.
Questions about the existing loan calculator
How do I find my current loan balance?
Enter the original amount, rate and term plus the number of payments made. The calculator reconstructs the schedule and reports the balance at that point.
Why have I paid so little principal so far?
Amortization front-loads interest. Early payments are mostly interest, so principal falls slowly at first and faster later — which is why early extra payments help most.
Is this useful before refinancing or selling?
Yes — knowing your exact balance and remaining interest is the starting point for comparing a refinance or estimating proceeds from a sale.
Is the Existing Loan Calculator free to use?
Yes. Every calculator on FinCalculators is completely free, with no sign-up, login or paywall. You can run as many scenarios as you like.