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Percentage Calculator
Find a percentage of a number, one number as a percentage of another, or the percentage change between two values.
YOUR RESULT
Percentage of amount
- Value A
- 20
- Value B
- 200
Calculation method & assumptions
Uses A × B / 100, A / B × 100, or (B − A) / A × 100, depending on the selected mode.
A zero denominator has no defined percentage. For a negative starting value, percentage change uses the signed starting value.
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15 useful tools · Ready when you areView all tools
Three steps. Ready for what’s next.
01
Enter your inputs
Use the labelled fields and select the assumptions or dates that apply to your calculation.
02
Review the result
Results update as inputs change. Check the breakdown, calculation method and assumptions.
03
Copy or download
Copy a summary or download the calculation breakdown as a CSV.
About Percentage Calculator.
How percentage is calculated
Uses A × B / 100, A / B × 100, or (B − A) / A × 100, depending on the selected mode.
What the result means
Find a percentage of a number, one number as a percentage of another, or the percentage change between two values.
Assumptions and scope
A zero denominator has no defined percentage. For a negative starting value, percentage change uses the signed starting value.
Using the calculator
Enter calculation, value a, value b. Change the values to compare results. Calculations run in your browser. No account is required.
A LITTLE CLARITY
Good questions. Simple answers.
A few helpful answers before you get started.
Do I need an account?
No. This tool is open to everyone without signing in.
Does this tool need the internet?
Your inputs are calculated in this browser. Load the tool online before using it offline.
Still have a question?Get in touch