Percentage Calculator
Calculator ToolsPercent of, percent change & what % is X of Y
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History
All history →Percentage Calculator — at a glance
Solve everyday percentage questions — discounts, marks, growth and more — without doing the maths.
How to use it — step by step
Pick the type of question, then enter your two numbers.
Enter your numbers
Fill in the fields — sensible example values are already filled in.
Pick your options
Choose any dropdowns or switches that apply to your case.
Calculate
Press the button. The result is created instantly on your device.
Read the answer
The main answer is shown big at the top, with details below it.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
How do I calculate percentage change?+
Subtract the old value from the new one, divide by the old value, and multiply by 100.
What is 15% of 200?+
30. Multiply 200 by 0.15.
Why is percentage change not symmetrical?+
Going from 100 to 150 is +50%, but going back from 150 to 100 is −33.3%, because the base is different.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.