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Percentage Calculator

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Math & Data

Percentage Calculator

Calculate percentages, ratios, and proportions.

Workspace

Run the tool here

Browser utility

Value

Reference

Mode

Output

Run the workspace to see the response here.

How to use

Pick the question you are answering.
Enter the two numbers.
Read the result and the formula used.

About this tool

Solve the common percentage questions: X% of Y, percentage change, and what percent one number is of another.

Percentage Calculator is part of the TmpMailer Math & Data set — free browser utilities that open instantly, need no account, and pair well with a temporary-email workflow when you just need a quick result.

Common use cases

Calculating a discount or tax amount.
Measuring growth between two periods.
Checking a conversion rate.

Common questions

Which direction does percentage change go?

It compares the new value with the old one: (new − old) / old. A negative result is a decrease.

Can percentages exceed 100?

Yes. A value that more than doubles represents an increase above 100%.

How do I reverse a percentage increase?

Divide by 1 plus the rate. For a 20% increase, divide by 1.2 rather than subtracting 20%.

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