Percentage Calculator

Solve every common percentage question in one place.

Percentage Calculator

Fast online calculation engine

Base Value

Percentage (%)

10% of 10000010,000

After 10% Increase110,000

After 10% Decrease90,000

Ad Space (auto) — Configurable via NEXT_PUBLIC_ADSENSE_CLIENT

What does Percentage Calculator do?

Four calculators in one: what is X% of Y, X is what percent of Y, percentage change between two numbers, and adding or removing a percentage. Each mode shows the formula it used so you can check the working.

How to Use Percentage Calculator

1
Pick a modeChoose the question you are trying to answer from the tabs.
2
Enter your numbersFill in the two values. Decimals are fine.
3
Read the resultThe answer and its formula appear as you type.

Key Features

Four modes covering the questions people actually ask about percentages
The formula and substituted values are shown with every answer
Handles decimals and negative numbers correctly
Explains the difference between percentage points and percent change
Clear errors instead of NaN when a divisor would be zero

Frequently Asked Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For 15% of 240: 240 × 15 ÷ 100 = 36. The "percent of" mode does this for you.

What is the percentage change formula?

((new − old) ÷ |old|) × 100. From 80 to 100 is ((100 − 80) ÷ 80) × 100 = 25% increase. Using the absolute value of the old number keeps the sign meaningful when the starting value is negative.

What is the difference between percent and percentage points?

If a rate moves from 4% to 6%, that is a rise of 2 percentage points but a 50% increase. News reports mix these up constantly; the calculator labels both.

Why can a percentage increase be over 100%?

Because the increase is measured against the starting value. Going from 10 to 30 is a 200% increase — the number tripled. Only a decrease is capped, at 100%, because you cannot lose more than everything.

100% Data Privacy

Your data and files are processed strictly inside your browser. No data is stored, logged or uploaded to any server.