Answer30
Percentage Helper
For discounts, bills, reports, and all the times the formula disappears from your head.
Build notesUnder the hood, without the lecture
This tool answers three common percentage questions with the same two fields, then gets out of the way.
Three questions, two inputs
The selected mode changes both labels and formula. The result is derived while typing and formatted to two decimal places, so there is no calculate button or stale answer.
Zero gets a human answer
Ratios and percentage change can divide by zero. Those paths return a clear message instead of showing Infinity or NaN.