Checked Math

Math

Math calculators

Percentages and proportions: solve for the value you are missing and see the formula and every step used to get it.

Which calculator answers your question

If you want to know…Use
What is 15% of 200?Percentage — “What is X% of Y?”
30 is what percent of 200?Percentage — “X is what % of Y?”
30 is 15% of what number?Percentage — “X is Y% of what?”
How tall is a 16:9 image that is 1920 wide?Aspect ratio — solve height
What ratio is 3840 × 2160?Aspect ratio — simplify ratio

Calculators in this group

Percentage CalculatorA percent of a number, what percent one value is, or the original value.Aspect Ratio CalculatorThe missing width or height for a ratio, or the simplest form of a ratio.