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Loan Calculator
Enter an amount, an annual rate and a term, and see the monthly payment, the total interest, and how each payment splits between interest and principal early versus late in the loan.
100% private — everything runs in your browser, nothing is ever uploaded.
How to use it
- Enter the loan amount, annual interest rate and term in years or months.
- Read the monthly payment, total interest and total repaid.
- Adjust any number and compare — the numbers update instantly.
Why it stays private
Shopping for a loan means typing real financial figures into something. The standard amortisation formula runs in your browser here — the numbers are not sent to anyone, and no lender is notified that you were looking.
Questions
What formula does it use?
The standard amortising payment formula used by banks worldwide: payment = P·r / (1 − (1+r)^−n), where r is the monthly rate and n the number of payments. It matches what a bank quote should say for a fully amortising loan.
Does it include fees or insurance?
No — it models principal and interest only. Arrangement fees, insurance and early-payment penalties are loan-specific; add them mentally to the total cost before comparing offers.
Why is so much of my early payment interest?
Interest each month is charged on the remaining balance, which is largest at the start. The schedule shows the split shifting over time — this is why overpaying early saves the most interest.