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Module · Math · Scientific
Percentage Calculator
6 percentage modes: percentage of, X is what percent of Y, percent change, increase/decrease, and solve-for-X. Live formula breakdown as you type.
Result
30.00
20% × 150 ÷ 100 = 30
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Guide
How Percentage Calculator works
Step 01
Pick a mode
6 modes cover 99% of everyday percentage math.
Step 02
Enter values
Two inputs — the tool relabels them based on the mode you picked.
Step 03
See result + formula
The exact formula used is shown so you can double-check the math.
FAQ
Frequently asked
How do I calculate percent change?+
((new − old) / old) × 100. This tool does it for you in the 'percent change' mode.
What's the difference between percent increase and percent of?+
'20% of 150' = 30 (raw fraction). '150 increased by 20%' = 180 (150 + 20% of 150).