Percentage Calculator — 5 Modes with Formulas Shown

Five modes in one tool: basic percentage, percent of total, percent change, reverse percent, and add/subtract percent. Shows the formula alongside every result. No signup.

Keywords: percentage calculator, percent change, percentage increase, percentage decrease, reverse percentage, online calculator

Frequently Asked Questions

What modes are available?

Basic (X% of Y), percent of total, percent change, reverse percent, and add/subtract percent.

Can I see the formula used?

Yes, each mode shows the exact calculation formula alongside the result.

Does it round results?

Results are shown with up to 6 significant digits and rounded sensibly for display.