Loan Calculator
Enter the loan amount, annual interest rate, and term to calculate the monthly payment, total interest, and total repayment for the amortized, equal-principal, and bullet repayment methods in real time. All calculations happen inside your browser.
Enter your loan details to see the results.
How to use
- Select a repayment method (amortized, equal principal, or bullet).
- Enter the loan amount, annual interest rate (%), and loan term (months).
- The monthly payment, total interest, and total repayment are shown in real time.
Calculation basis and verification sources
The monthly rate is the entered nominal annual rate ÷ 12. Level-payment mode uses the fixed amortization formula, equal-principal mode uses constant principal plus declining balance interest, and interest-only mode pays monthly interest with principal at maturity. Displayed amounts are rounded to whole units.
Model checked: 2026-08-07. It assumes a fixed rate and monthly payments; it excludes APR differences, day-count rules, prepayment, grace periods, fees, tax, insurance, late charges, and final-payment rounding adjustments. Use the lender's contract schedule and total cost as authoritative.
Frequently asked questions
What is the difference between amortized and equal-principal repayment?
With the amortized method the amount you repay each month (principal + interest) stays the same, making it easy to plan. With the equal-principal method the principal repaid each month is fixed and the interest gradually decreases, so early payments are larger but the total interest is lower.
How is bullet repayment calculated?
With bullet repayment you pay only the interest each month during the loan term and repay the entire principal at once at maturity. The monthly interest is constant, equal to the principal times the monthly rate.
Is the information I enter sent to a server?
No. All calculations happen only inside your browser, and your loan details are never sent to or stored on any server.
Practical example and verification criteria
Loan Calculator: Before calculating, check whether amounts are before or after tax, whether a term is in days, months, or years, whether a rate is annual or monthly, and whether start and end dates are inclusive. Align body measurements and currency, length, and time units as well. On-screen defaults may be illustrative assumptions, so replace them with your own conditions.
Loan Calculator: For a quick check, start with 10,000,000 @ 5% / 12 as a small input whose result relationship you can verify directly. Confirm that the input summary, units, and options match your intent before applying the tool to real values or a copy of the source; this reduces setup mistakes.
Loan Calculator: Read the input summary and formula, then check reversible relationships such as principal plus interest, net amount plus tax, or start date plus term. Test values around rounding, zero, one, and date boundaries. Compare health, finance, tax, and administrative results with current official information for the applicable region and effective date.
Loan Calculator · Work record: For real work, record the input conditions, selected options, and result together. Do not assume the same state will remain after a refresh or device change. Preserve important results separately using copy, download, a screenshot, or another method the page supports, then reopen them in the target environment.
Loan Calculator · Error check: If an error or unexpected result appears, reduce the input, run again with default options, and then change one condition at a time. Recording error messages and boundary values helps distinguish format issues, unsupported cases, and browser resource limits, and prevents an empty result from being mistaken for success.
Loan Calculator · Scope of use: Check the page guidance for browser processing versus server lookup, storage location, and supported scope. Use sensitive source material or secrets only when strictly necessary. High-impact work such as legal, financial, or medical decisions or changes to an operational system requires current authoritative information and a separate verification process.
This result is an estimate for reference only and may differ from actual figures depending on applicable rules and individual circumstances. Confirm important decisions with the relevant authorities or a professional.