How do I get the price after a 20% discount?

Multiply the original price by 0.8, which is the same as subtracting 20%. For a 30% discount, multiply by 0.7.

Going from 50 to 100 is what percentage increase?

A 100% increase. Percentage change is (new − old) ÷ old × 100.

Percentage Calculator

Calculate X% of a value, percentage ratio, and percentage increase/decrease

1. What is X% of Total Value?

Total Value

Percentage (%)

Result Value:20

2. What % is Part Value of Total Value?

Total Value

Part Value

Ratio:25.00%

3. Percentage Increase/Decrease from A to B

Original Value (A)

New Value (B)

Change Rate:+30.00%

4. Value after X% Increase/Decrease

Total Value

Rate (%)

After X% Increase:115

After X% Decrease:85

Three kinds of percentage calculation

Percentages are easy to mix up: finding X% of a total, finding what proportion one number is of another, and finding how much a value rose or fell each use a different formula. All three are separated out here on one screen.

How to use it

Choose the calculation type: percentage of a total, proportion, or percentage change.
Enter your numbers.
Read the result along with the formula that was applied.

Frequently asked questions

How do I get the price after a 20% discount?: Multiply the original price by 0.8, which is the same as subtracting 20%. For a 30% discount, multiply by 0.7.
Going from 50 to 100 is what percentage increase?: A 100% increase. Percentage change is (new − old) ÷ old × 100.