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pct.199xc.com is a lightweight percentage calculator covering the three most common operations. The page stays simple and shows results as you type.

Op 1

Percent of a number, e.g. 15% of 200 = 30.

Op 2

What percent X is of Y, e.g. 30 of 200 = 15%.

Op 3

Change from A to B, e.g. 100 → 120 = +20%.

How to use

  • Enter numbers and percentages in each section.
  • Results update live.
  • A divisor of 0 prompts for a valid value.