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.
💡 Advantages of using 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
🔢 Percentage Calculator
Calculate percentages, increases, discounts and percentage changes instantly
🔢 Free Online Percentage Calculator
Calculate percentages easily: what percentage one number is of another, increases, discounts and more.
🔢 How much is X% of a number?
📋 Common Percentage Table
How to calculate percentages?
🔢 Porcentaje de un número
Para calcular el X% de un número, simplemente multiplica el número por X y divide entre 100. Por ejemplo, el 25% de 200 es 200 × 25 ÷ 100 = 50.
📈 Cambio porcentual
El cambio porcentual se calcula restando el valor original del nuevo valor, dividiendo entre el valor original y multiplicando por 100. Útil para calcular descuentos, aumentos de precio o variaciones de datos.
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⚡ Cómo usar en 3 pasos
- 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.
Frequently Asked 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 WebTools 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.