Percentage Calculator
Compute x% of y, what percent x is of y, the base, and percent increase/decrease.
Input Data
依模式解讀（百分比或數值）。
依模式解讀（數值或百分比）。
Results
30
20% of 150 = 30
At a glance:A percentage is a ratio per hundred. This tool solves five cases: x% of y, x as a percent of y, the base that x is y% of, and percent increase/decrease.
Formula
x% of y = y × x / 100.
x is what % of y = x / y × 100%.
x is y% of what = x / (y / 100).
change: x × (1 ± y/100).
How to Use
- Pick a mode.
- Enter x and y.
- Read the result.
FAQ
How do discounts work?
Price × (1 − discount%) gives the reduced price; e.g. 200 at 20% off = 200 × 0.8 = 160.
Percent vs percentage point?
Percent is a ratio; a percentage point is the difference of two percentages (20%→25% is +5 points).
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References
Content review: Calculatorism Science Team. Results are for reference only.