How it works
Percentages show up everywhere in daily life. This tool bundles four common cases — portion, share, percent change, and discount — behind one mode switch. Pick a mode, fill in A and B, and the result updates instantly.
FAQ
Q. What does a negative % change mean?
A. It means the later value dropped below the earlier one — the value decreased by that percentage.
Q. What's the difference between percent and percentage points?
A. Percent is a ratio; a percentage point is the raw difference between two percentages (e.g. 10%→15% is a 5pp rise).
Q. How are decimals handled?
A. Results are rounded to two decimal places by default.