Percentage calculator
Find a percentage of a value, a part’s percentage, or the whole from a known part.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
Your result
Complete the inputs to see your result.
How it works
- Percentage of a value: Value × Percentage or part ÷ 100; Part as percentage of whole: Percentage or part ÷ Value × 100; Find the whole from part and percentage: Value ÷ (Percentage or part ÷ 100)
- Worked example: 200 × 15 ÷ 100 = 30; 30 ÷ 200 × 100 = 15%; 30 ÷ 0.15 = 200
- Supported input limits: Value: -1000000000000 ≤ x ≤ 1000000000000; Percentage or part: -1000000000000 ≤ x ≤ 1000000000000
Assumptions and limitations
Choose the mode and enter only its required values. Division by zero is rejected or shown as undefined. Integer bases and fractions retain exact integer arithmetic; rounded decimal displays do not replace it. List statistics describe the supplied observations only; weighted mode changes the mean, not the order statistics.
Sources
- OpenStax — percent definitions Sources reviewed: 2026-10-06
