Everyday math
Percentage calculator
Calculate percentages, ratios, and percentage change without wrestling with the formula.
Results update instantly as you type. Percentage change uses the absolute starting value as the denominator.
Answer
30
20% of 150 is 30.
First value20
Second value150
CalculationPercentage of a number
For informational use. When the starting value is zero, percentage change is mathematically undefined and this calculator displays 0.
Plain-language method
Three percentage questions, one simple tool.
Choose the question you want to answer. “Percent of” multiplies a number by a percentage. “What percent?” compares a part with a whole. “Percent change” compares a new value with its starting value.
Percent change = ((new − original) ÷ |original|) × 100
Results update instantly and stay on your device. Review the assumptions above before using an estimate for a financial decision.