How do I calculate loan interest? Enter your numbers above and the result updates instantly. For example: Loan amount: $20,000 · Interest rate: 8% · Term: 5 yrs → Total interest: $4,332.
Is this Loan Interest Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for loan interest. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.