Loan Tools
Loan Calculator
Calculate your monthly loan payment and see exactly how much interest you'll pay. Use extra payment options to see how much you can save and how early you'll be debt-free.
Configure
Loan parameters
How to use the loan calculator
01
Enter loan amount & rate
Input the principal amount, annual interest rate, and loan term in years.
02
Add extra payment (optional)
Enter an extra monthly amount to see how it accelerates payoff and reduces total interest.
03
Review savings
See monthly payment, total cost, and — with extra payments — how many months and dollars you save.
Frequently asked questions
How is a monthly loan payment calculated? ▼
Monthly payment = P × [r(1+r)^n] / [(1+r)^n - 1], where P is the principal, r is the monthly rate (annual rate ÷ 12), and n is the number of payments (years × 12). This formula ensures principal and interest are fully paid by the last payment.
How much does an extra $100/month save? ▼
It depends on your balance and rate. On a $20,000 loan at 7% for 5 years, an extra $100/month saves roughly $400 in interest and pays off 8 months early. The larger the balance and higher the rate, the bigger the savings.
Should I pay extra principal or invest the money? ▼
Compare the loan's interest rate to expected investment returns. If your loan is at 4% but investments return 8%, investing may win long-term due to higher returns. But reducing high-interest debt (8%+) usually beats investing as a guaranteed, risk-free 'return'.
Disclaimer: Results are estimates. Actual loan terms, origination fees, and prepayment penalties may affect your total cost. Always review the full loan agreement.
Support NumeraFin
Use this result, then keep moving to the next tool
If this calculator helped, share it, leave a quick rating, or jump back into the directory for the next decision.
Was this helpful?
Rate this tool
Tap a star to leave a rating.