Percentage Calculator

Three of the percentage questions that come up most: a share of a value, one number as a percentage of another, and the change between two numbers.

How to use it

1. Choose which question you are answering.
2. Enter the two values.
3. The answer updates as you type.

Questions

Why is a rise then an equal fall not back where you started? Because each is measured against a different base. A 50% rise from 100 gives 150; a 50% fall from 150 gives 75, not 100. Percentage changes do not cancel.

What is the difference between percent and percentage points? A rate moving from 5% to 6% is a rise of one percentage point, but a 20% increase. Reports often blur the two, usually in whichever direction sounds better.