Percentage calculator
Find a percentage of a value, a part’s percentage, or the whole from a known part. Drag the graph handles to change inputs and explore the result.
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.
How it works
- Percentage of a value: × ÷ 100; Part as percentage of whole: ÷ × 100; Find the whole from part and percentage: ÷ ( ÷ 100)
- Worked example: 200 × 15 ÷ 100 = 30; 30 ÷ 200 × 100 = 15%; 30 ÷ 0.15 = 200
- Supported input limits: : -1,000,000,000,000 ≤ x ≤ 1,000,000,000,000; : -1,000,000,000,000 ≤ x ≤ 1,000,000,000,000
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
Select the operation before entering values: percent of a whole, one value as a percentage of another, or the whole from a known part. A zero divisor has no defined result; negative values retain their mathematical sign.
Sources
- OpenStax — percent definitions Sources reviewed: 2026-10-06
