Private CSV export Extra payments

Loan & Mortgage Calculator

All calculations run in your browser. Forecast payments, compare payoff strategies, and download the schedule.

Payment modes Monthly / Biweekly / Weekly Switch instantly to compare cashflow

Extra payments Supported See months saved automatically

Export CSV Take the full amortization with you

Start calculating Read FAQ

No sign-up, no data upload. Works offline after the first load.

Calculator

Enter your loan details to compute payment per period, total paid, and total interest.

Values update after each calculation so you can compare scenarios quickly.

Payment per period —

Total paid —

Total interest —

Use the extra payment field to see how many months you can shave off the schedule.
Switch to biweekly or weekly payments to compare accelerated payoff options.
Download the CSV to share with a lender or keep personal records.

Need a lump-sum scenario? Enter the lump sum as a one-time extra payment to see how it affects payoff timing.

#	Payment	Principal	Interest	Balance

Biweekly payments equate to 26 payments per year — roughly one extra monthly payment.
Weekly payments can smooth cashflow for freelance or hourly income.
Track the total interest metric to see how much each option saves.

Privacy: All calculations run in your browser. We don’t upload your data.

Disclaimer: For informational purposes only; not financial advice.

Which currencies are supported?

We format results using your browser locale. Change your system locale for other currencies.

Can I save multiple scenarios?

Export the CSV or take screenshots of the results card to keep a record of each scenario.

Does the calculator support adjustable-rate loans?

Not yet. You can approximate by recalculating with the new rate when the adjustment occurs, then combining schedules.

Will my data leave this device?

No. Everything runs locally in your browser. Close the tab to clear the inputs.