Percentage Calculator
Percent of, increase/decrease, and what-percent calculations.
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About the Percentage Calculator
Solve every common percentage question in one place. The Toolcenter Percentage Calculator covers “what is X% of Y”, “X is what percent of Y”, percentage change from one value to another, and the reverse “X is P% of what number”. Each block updates instantly as you type.
How to use it
- 1Pick the calculation that matches your question.
- 2Enter the two known numbers.
- 3Read the answer immediately.
- 4Use another block for a related calculation.
Key features
- Percent of a number
- One number as a percent of another
- Percentage increase and decrease
- Reverse percentage (find the whole)
- Live results, no upload
Frequently asked questions
How do I calculate a percentage increase?+
Use the “percentage change” block: enter the starting value and the new value, and it returns the percent increase or decrease and the difference.
How do I find the original price before a discount?+
Use the reverse block: enter the discounted amount as the value and the percentage it represents to get the original.
Does it handle decimals?+
Yes. All inputs and results support decimal values.
Is anything sent to a server?+
No. Every calculation runs in your browser.
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