Math

Percentage Calculator

Solve the three most common percentage problems: a percent of a number, what percent one value is of another, and the percentage change between two numbers.

Last updated

Results

20% of 150
30

Three percentage problems, one tool

Most everyday percentage questions fall into three shapes: finding part of a whole, expressing a part as a percentage, or measuring growth between two figures. Pick the matching mode and enter your two numbers to get an instant answer.

Worked example

Suppose you want to find 20% of 150 using the default 'What is X% of Y?' mode.

  1. 1.Convert the percent to a decimal (20 / 100)0.2
  2. 2.Multiply by the number (0.2 x 150)30

Result: 20% of 150 is 30.

Frequently asked questions

CalculatorKingdom

Free, fast and accurate calculators for finance, health, math and everyday life.

Finance

Loan, mortgage, interest and tax calculators to plan payments, compare options and understand the true cost of borrowing.

Marketing

Advertising and campaign calculators to price impressions, clicks and conversions and measure return on ad spend.

Health

Body and nutrition calculators to track BMI, estimate calorie needs and support your fitness goals.

Math

Everyday math helpers for percentages, ratios and quick calculations you can trust.

Education

Exam and grade calculators to predict AP scores, work out the marks you need and plan your studies.

Everyday

Practical day-to-day calculators for tipping, splitting bills and working out ages.

Home & Garden

Project calculators for home and yard work: measure rooms and areas, estimate paint, and order the right amount of mulch or topsoil.

Conversions

Unit converters that turn one measurement into another quickly and accurately.

© 2026 CalculatorKingdom. Results are estimates for general information only.