How do I find a percentage of a number?

Convert the percent to a decimal and multiply. 20% of 150 is 0.20 × 150 = 30.

How do I calculate percentage change?

Subtract the old value from the new, divide by the old value, and multiply by 100. A negative result is a decrease.

Calculate percentages, percentage change, and percentage of a number.

Calculation

Value X

Value Y

Result

50.00

25% of 200 is 50.00.

Percent of a number, percentage change, and "X is what percent of Y" — the three calculations you actually use, explained with simple examples.

Standard tipping percentages for restaurants, delivery, and services in the US — plus how to split a bill fairly.

Convert between units of length, weight, volume, temperature, and more.

Calculate tip amount and split the bill among multiple people.

Calculate discounted price and savings for any percentage off.