Percentage Calculator
Calculate percent-of, percent share, and percent changes.
Percent of value
30
Value as percent of total
No result
Increase by percent
230
Decrease by percent
170
Formula
Percent of value = value × percent / 100. Value as a percent of total = value / total. Increase or decrease = value × (1 ± percent / 100).
The percentage calculator handles common percent tasks: a percent of a value, a value as a percent of a total, and increasing or decreasing by a percent.
How to Use
The percentage calculator handles common percent tasks: a percent of a value, a value as a percent of a total, and increasing or decreasing by a percent. Enter the Value, Percent, and Total values and review the Percent of value, Value as percent of total, Increase by percent, and Decrease by percent outputs after you calculate.
- Open the calculator : Start with Percentage Calculator.
- Enter values : Fill in the required inputs and any optional settings.
- Review the result : Read the output and use the about page for more detail if needed.
Common Questions
What formula does the Percentage Calculator use?
Percent of value = value × percent / 100. Value as a percent of total = value / total. Increase or decrease = value × (1 ± percent / 100).
How do you calculate a percentage increase?
To calculate a percentage increase, subtract the original value from the new value to find the absolute difference. Then, divide that absolute difference by the original value and multiply the result by 100.
Is a 50% increase followed by a 50% decrease the same original number?
No. If you increase $100 by 50%, you get $150. If you then decrease that $150 by 50%, you lose $75, leaving you with $75. Percentage changes always apply to the newest baseline number, not the original starting point.