Question 1

How do I calculate what percentage one number is of another?

Accepted Answer

To find what percentage A is of B, divide A by B and multiply by 100. For example, to find what percentage 25 is of 100: (25 ÷ 100) × 100 = 25%.

Question 2

How do I calculate percentage increase or decrease?

Accepted Answer

To calculate percentage change: ((New Value - Old Value) ÷ Old Value) × 100. If the result is positive, it's an increase; if negative, it's a decrease.

Question 3

How do I calculate a discount percentage?

Accepted Answer

To calculate the discount amount: (Original Price × Discount Percentage) ÷ 100. The final price is: Original Price - Discount Amount.

Question 4

What's the difference between percentage and percentage points?

Accepted Answer

Percentage is a proportion out of 100, while percentage points refer to the arithmetic difference between percentages. For example, if something increases from 20% to 25%, that's a 5 percentage point increase, but a 25% relative increase.

Question 5

Can I calculate reverse percentages?

Accepted Answer

Yes! If you know the result and the percentage, you can find the original value. For example, if 120 is 80% of a number, the original number is 120 ÷ 0.8 = 150.

Percentage Calculator

Basic Percentage Calculation

Frequently Asked Questions

How do I calculate what percentage one number is of another?

How do I calculate percentage increase or decrease?

How do I calculate a discount percentage?

What's the difference between percentage and percentage points?

Can I calculate reverse percentages?