What is the percentage change from 100 to 80?
20% decrease
From 100 to 80 is a 20% decrease.
How it is worked out
Subtract the old value from the new one, divide by the OLD value, then multiply by 100. Dividing by the new value is the usual mistake.
80 − 100 = -20, and -20 ÷ 100 × 100 = -20%
Try your own numbers
Answer20% decrease
Open the full percentage calculator for every other form.
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Percentage change
Questions
- What is the percentage change from 100 to 80?
- From 100 to 80 is a 20% decrease. 80 − 100 = -20, and -20 ÷ 100 × 100 = -20%.
- How do you work this out?
- Subtract the old value from the new one, divide by the OLD value, then multiply by 100. Dividing by the new value is the usual mistake.
- Can I use other numbers?
- Yes — the calculator on this page takes any two numbers, and the full percentage calculator covers every form: percentage of a number, one number as a percentage of another, percentage change, increase and decrease.