What is X% of Y?
What is
% of
?
Use this when you know the percentage and want to find the actual value. Example: what is 20% of 500?
Result
50
X is what % of Y?
is what percentage of
?
Use this to express one number as a share of another. Example: 45 out of 180 — what percentage is that?
Result
25%
Percentage Change
Starting value
New value
See how much something increased or decreased between two values. Example: price went from $80 to $120.
% Change
+50%
X% of what is Y?
% of what number equals
?
Work backwards when you know the result and the percentage but not the original total. Example: 20% of what number equals 50?
Result
250
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Which calculator do I need?
Percentages show up everywhere — discounts, tax, test scores, salary raises — but the actual calculation depends on what you already know and what you're trying to find. Here's how each section works:
- What is X% of Y? — You know the percentage and the total. Example: a $200 item has a 25% discount. What's the discount amount?
- X is what % of Y? — You want to express one number as a share of another. Example: you scored 45 out of 60. What's your percentage?
- Percentage change — You want to see how much something grew or dropped. Example: salary went from $80,000 to $95,000 — what's the increase?
- Work backwards — You know the result and the percentage but not the original total. Example: 15% of something equals $75. What's the full amount?
All results update as you type
No need to hit a button. The math runs entirely in your browser — nothing is sent anywhere or stored.