Percentage Calculator

Find a percentage of a number, what percent one number is of another, or percent increase/decrease.

Mode

Percent (X)

Number (Y)

20% of 150

30.00

How it works

X% of Y: (X ÷ 100) × Y

Percent change: ((new − old) ÷ old) × 100

Add, subtract, multiply, and divide fractions.

Simplify ratios and scale them proportionally.

Solve ax² + bx + c = 0 and show the discriminant.

Calculate area of rectangles, circles, triangles, and trapezoids.