Instantly calculate what X percent of Y is. Free percentage calculator with the formula shown for every result.
The calculation is X ÷ 100 × Y.
Example
Example: 20% of 150 = 20 ÷ 100 × 150 = 30.
This is the calculation behind sales tax on a purchase, a sales commission, a grade on a test, or figuring out how many people in a survey picked a particular answer — anytime you know a percentage and a total and need the piece it represents.
Another example
An 18% tip on a $60 restaurant bill: 18 ÷ 100 × 60 = $10.80.
How do I work backward to find the original price of an item if I only know the clearance price and the discount?
Do a quick reverse calculation: divide the final clearance price by (1 minus the discount decimal). For example, if a jacket cost $40 after a 20% markdown, divide $40 by 0.8 — and boom, the original price was $50.
Is there a quick mental-math shortcut for common percentages like 10%, 15% or 50%?
Yeah — 10% of any number is just moving the decimal one place left (10% of 150 is 15). 50% is half. For 15%, find 10% first, then add half of that amount on top. It's the same math this calculator does, just broken into easier chunks.
Why does my calculator or spreadsheet sometimes show a percentage as a weird decimal like 0.2 instead of 20%?
Spreadsheets and some calculators store percentages internally as decimals (20% = 0.2) and only add the % symbol for display. If you're plugging numbers into a formula manually, make sure you're consistently using either the decimal form or the whole-number form, not a mix of both.
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