Percentage Calculator

4 common formulas: X% of a number, what %?, increase/decrease by %, % difference.

Auto calculation

Enter values

Finance

Percent (%)

Number

Part

Of total

Number

Change by (%)

Operation

Increase Decrease

Old value

New value

Result

CalcCore

Choose a mode and click “Calculate”.

What is a percentage calculator and why use it?

A percentage calculator is a quick tool to compute parts of a number, apply percentage change, and compare two values in percent. It’s useful for discounts, finance, taxes, business metrics, and everyday calculations.

With this calculator you can find X% of a number, determine what percent one value is of another, increase or decrease a value by a percent, and calculate percentage difference.

What can you calculate?

X% of a number
What percent one number is of another
Increase a value by a percent
Decrease a value by a percent
Discounts and markups

FAQ

How do I calculate X% of a number?

Multiply the number by the percent and divide by 100. Example: 20% of 500 = 500 × 20 / 100 = 100.

How to find how many percent one number is of another?

Divide the part by the total and multiply by 100. This is commonly used to compare prices, growth, and ratios.

How does increase by percent work?

Add the percentage of the number to itself. Example: add 15% to 200 → 200 + (200 × 15 / 100) = 230.

How to calculate a discount in percent?

A discount is a percent of the original price. Example: 25% off 800 means you save 200 and pay 600.

Can I use it for finance calculations?

Yes — it’s great for basic finance tasks: discounts, commissions, percentage changes, and quick estimates.