ZovaTool

Percentage Calculator

Result

15% of 200
30

Step-by-step

Step 1
15% × 200 = (15/100) × 200
Step 2
= 0.15 × 200
Step 3
= 30

Common percentages of 200

1%
2
5%
10
10%
20
15%
30
20%
40
25%
50
33.33%
66.66
50%
100
75%
150
100%
200

How to use the Percentage Calculator

  1. Pick a mode: 'X% of Y', 'X is what % of Y', '% change', increase/decrease, add/subtract %, or tip.
  2. Enter the two values.
  3. Read the result and the step-by-step working.
  4. Save useful results with ★ Save to revisit later.
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Percentages, demystified

Percent literally means 'per hundred', so any percentage is just a fraction with denominator 100. 15% = 15/100 = 0.15. Once you internalise that, every percentage problem reduces to ordinary multiplication or division.

The three building blocks are: (1) 'X% of Y' which is X/100 × Y, (2) 'X is what % of Y' which is (X/Y) × 100, and (3) '% change from A to B' which is ((B−A)/A) × 100. The 9 modes in this calculator are all combinations of these three primitives.

Common gotcha: a 20% increase followed by a 20% decrease does NOT return you to the original — it returns 96%. The calculator's increase/decrease modes make this easy to verify.