# Percentage Calculator

URL: https://tools.otaku-dojo.com/en/percentage-calculator
Updated: 2026-10-03

The Percentage Calculator answers the four most common questions: "What is B% of A?", "A is what percent of B?", "What is the percentage change from A to B?" and "What is the price after B% off A?". Results appear as you type, together with the full formula so you can check quotes, grades, growth rates and discounts.

## How to use the Percentage Calculator

1. Choose the calculation type.
2. Enter two numbers — the field labels change with the calculation.
3. The answer, related values and formula appear instantly.

## Specs & key facts

- **Calculations**: B% of A, A as % of B, percentage change, price after discount
- **Change formula**: (new − old) ÷ old × 100%
- **Precision**: Up to 4 decimal places
- **Formula**: Shown for every result
- **Processing**: In your browser
- **Price**: Free, no sign-up

## Examples: Sales growth

```text
Last month 1,280 → this month 1,600
```

→

```text
Increase +25% ((1600 − 1280) ÷ 1280 × 100)
```

## Examples: 25% off

```text
Price 1,280, 25% off
```

→

```text
Sale price 960, you save 320
```

## FAQ

### If something rises 50% and then falls 50%, is it back where it started?

No. 100 up 50% is 150; 150 down 50% is 75, because each change uses a different base.

### What is the difference between percent and percentage points?

An interest rate moving from 2% to 3% rose by 1 percentage point, but by 50 percent.

### How do I calculate what percent A is of B?

Divide A by B and multiply by 100 — for example, 45 out of 60 is 75%.