12 is what percent of 30?
40%
12 is 40% of 30.
How it is worked out
Divide the part by the whole, then multiply by 100.
12 ÷ 30 = 0.4, and 0.4 × 100 = 40%
Try your own numbers
Answer40%
Open the full percentage calculator for every other form.
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One number as a percentage of another
Questions
- 12 is what percent of 30?
- 12 is 40% of 30. 12 ÷ 30 = 0.4, and 0.4 × 100 = 40%.
- How do you work this out?
- Divide the part by the whole, then multiply by 100.
- 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.