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Percentage Calculator
Solve common percentage questions: percent of a number, part of whole, and percent change.
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What is X% of Y?
X is what percent of Y?
Percentage change
Guide
How this percentage calculator works
This tool handles common percentage problems: finding a percent of a number, finding what percent one number is of another, and measuring percent change.
Percent of a number
Use this for discounts, tips, fees, and portions.
Part of whole
Use this when you know the part and total and want the percentage share.
Percent change
Use this to compare an old value to a new value as an increase or decrease.
FAQs
What does percent change mean?
Percent change compares the difference between new and old values relative to the old value.
Why is the old value important?
The old value is the baseline. Changing the baseline can change the percentage dramatically.
Can I use negative values?
Yes, but interpret carefully. Percent change with negative baselines can be confusing in real-world contexts.
Note: Percent change uses the old value as the starting point.
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