Percentage Calculator

Calculate percentages, increases, discounts and percentage changes instantly

How much is X% of a number?

What is% of?

Common Percentage Table

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Free Online Percentage Calculator

A percentage calculator with five distinct modes: how much is X% of a number, what percentage one amount represents of a total, the percentage change between two values, applying an increase or discount to a figure, and solving a rule-of-three (proportion) problem. Switch modes with the tabs and get the result instantly as you type.

Why use Percentage Calculator

5 modes in one tool: basic percentage, what % it represents, % change, increase/discount and rule of three
Instant result as you type, no calculate button needed
Shows whether the change was an increase or a decrease
Clear number formatting, up to 4 decimal places
Free, no sign-up and no limit on calculations

How to use it in 3 steps

1
Choose a mode
Select the tab that matches what you need to calculate.
2
Enter the values
Fill in the fields required for that mode.
3
Read the result
The result updates instantly as you type.

Questions about Percentage Calculator

What modes does this percentage calculator include?

Five: 'X% of a number', 'what percentage is X of Y', 'percentage change between two values', 'apply an increase or discount', and 'rule of three (proportion)'.

How do I calculate a discount with this tool?

Use the increase/discount tab, enter the original price and the percentage, and choose 'discount' to see the final price.

How do I know if a change was an increase or a decrease?

In the percentage change mode, a positive result means an increase and a negative one means a decrease relative to the starting value.

Can it calculate a rule-of-three problem?

Yes, the proportion mode solves simple rule-of-three problems from a known part and total.

Is Percentage Calculator free?

Yes, Percentage Calculator from WebHerramientas is 100% free. No registration or subscription required. You can use it as many times as you need at no cost.

Is it safe to use Percentage Calculator online?

Yes, all information is processed directly in your browser. We do not store or send your data to any external server.

Does Percentage Calculator work on mobile?

Yes, the tool is fully responsive and works on any device: phone, tablet or computer with a modern browser.