Finance calculators
Pure-math finance tools that don’t require an account, a newsletter signup, or your personal numbers leaving the browser. Tip, tax, and discount calculators ship first; mortgage, compound interest, and salary are next on the runway.
Available tools
Mortgage calculator
Monthly payment + total interest + total paid from price, down, rate, and term.
Compound interest calculator
Future value with periodic contributions and any compounding frequency.
Tip calculator
Tip percent + bill split + optional sales tax.
Sales tax calculator
Add sales tax to a pre-tax price or recover the pre-tax amount from a total.
Discount calculator
Single or stacked discounts — see the effective rate when 20% off meets another 10% off.