Percentage Calculator
Find percentages, calculate increases/decreases, and solve percent problems.
What is X% of Y?
What the tool does
Percentage Calculator solves everyday percent problems — what is X% of Y, percent change, and related increase/decrease math.
How to use it
- Choose the type of percentage problem.
- Enter the known values.
- Read the calculated percentage or amount.
Supported formats
- Numeric values and percents
Privacy & security
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
FAQs
- How do I calculate percent increase?
- Subtract the old value from the new, divide by the old value, and multiply by 100. The tool does this when you use the increase/decrease mode.
- Can it do reverse percentages?
- Yes for common cases like finding the original amount before a percent was applied, when that mode is selected.
- Are inputs saved?
- No.