Bū tools

Percentages

X % of Y, change in %, discount, before a rise.

What it does

Everyday percentages, each one as a short formula: type the two numbers, the result appears after the = sign. Tap a result to copy it.

• Change: from 120 to 150 is +25 %; from 150 to 120 is −20 % (not −25 %: the base is the first number).
• The price before a rise (remove a percentage already included): read it as “? + 20 % = 120”;: a price after a 20 % rise was 120 ÷ 1.2 = 100 before (not 120 − 20 %).

Free, no account, nothing is sent: it runs in your browser, even offline.

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