Percentage Calculator

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All-in-one percentage calculator: percent of, percent change, percent increase/decrease, and reverse percentage.

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Percentage Calculator

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About This Tool

The Four Most Common Percentage Problems

What is X% of Y? — e.g. what is 15% of 200?
X is what % of Y? — e.g. 30 is what % of 200?
Percent increase/decrease — going from old to new value.
Reverse percentage — finding the original price from a discounted price.

This calculator handles all four in a single interface — just pick the mode and enter your numbers.

Useful Formulas

X% of Y         = (X / 100) × Y
X is what % of Y= (X / Y) × 100
% change        = ((new − old) / old) × 100

Frequently Asked Questions

Which mode should I use to figure out a sale discount?

If you know the original price and discount %, use 'What is X% of Y' to find the savings. If you know the sale price and discount %, use 'Reverse' to find the original.

What's the difference between percent change and percentage points?

Percent change is relative. Percentage points are absolute. Going from 10% to 15% is a 5 percentage-point increase, but a 50% relative increase. Be careful which one you mean.

Why is dividing by zero an error?

Mathematically, X/0 is undefined — no number multiplied by zero gives a non-zero result. The calculator returns no value when Y is zero.