Loan Repayment Calculator
Calculate loan repayments, total interest and payoff schedule for weekly, fortnightly or monthly terms, free in your browser.
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Before you rely on this: Estimates only — not financial, tax or legal advice. Confirm current rates, fees and rules before relying on these figures.
How to use this calculator
- Enter the loan amount, the annual interest rate and the term in years.
- Press Calculate for the monthly repayment and total interest.
How it works
The repayment uses the standard amortised loan formula: M = P·i ÷ (1 − (1 + i)^−n), where i is the monthly rate (annual ÷ 12) and n is the number of months.
Each repayment covers the interest first, with the rest reducing the balance.
Worked example
$100,000 at 5% over 30 years. That works out to about $536.82 a month.
Common mistakes
- Entering the interest rate per month instead of per year — enter the annual rate; the tool converts it.
- Forgetting that a longer term lowers each repayment but raises the total interest paid.
- Treating the figure as a formal quote — it excludes fees, offsets and any rate changes.
Frequently asked questions
Is this principal and interest?
Yes — it assumes a principal-and-interest loan at a fixed rate.
Does it include fees?
No — add any establishment or ongoing fees separately.
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Cite this tool
Zerdly. (2026). Loan Repayment Calculator. Retrieved from https://www.zerdly.com/tools/loan-repayment-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.