fixmint

Percentage calculator

Four everyday percentage questions, answered as you type, with the working shown.

Runs on your device. Nothing is uploaded.
% of

= 12

is what % of

= 25%

to

= +30%

= 236

How to calculate a percentage

  1. Find the line that matches your question.
  2. Type the two numbers you know.
  3. Read the highlighted answer and the working under it.

Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. 15% of 80 is 80 × 15 ÷ 100 = 12.

How do I work out percentage change?

Subtract the old value from the new one, divide by the old value and multiply by 100. From 50 to 65 is (65 − 50) ÷ 50 × 100 = 30% up.

Why doesn’t a 20% rise followed by a 20% drop get me back to the start?

Because the drop is taken from the bigger number. 100 + 20% = 120, and 120 − 20% = 96. Each step uses a different base.

What is the difference between percent and percentage points?

Going from 4% to 5% is a rise of 1 percentage point, but a 25% increase relative to where it started.

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