Percentage Calculator

Compute a percentage of a value, or reverse the question: what percent is A of B. Useful for discounts, tax estimates, and score conversions.

Inputs

part = whole × (percent / 100)
percent = (part / whole) × 100

Mode “Of” uses the first formula. Mode “Is what %” uses the second. Division by zero is rejected.

Category: Math

Mode “Of”, X=15, Y=200 → 30.

Mode “Is what %”, X=30, Y=200 → 15%.