How do I calculate the percentage of a number?
To calculate Y% of X:
- Convert Y% to a decimal by dividing by 100.
- Multiply the decimal by X.
Example: To find 20% of 50:
- 20% = 0.20
- 0.20 × 50 = 10
The calculator does this automatically once you enter the values.
How do I calculate a percentage increase or decrease?
To find the percentage change from an original value:
- Subtract the original value from the new value to get the difference.
- Divide that difference by the original value.
- Multiply by 100 to get the percentage.
Example: Price goes from 80 to 100:
- Difference = 100 - 80 = 20
- (20 / 80) × 100 = 25% (a 25% increase)
For a decrease, subtract the new value from the original (i.e. (Original - New)/Original × 100).
How do I find what percent one number is of another?
To find what percent A is of B:
- Divide A by B.
- Multiply by 100.
Example: 20 is what percent of 80?
- 20/80 = 0.25
- 0.25 × 100 = 25%
So 20 is 25% of 80.
How do I use the percentage calculator?
- Enter the values into the calculator fields (for example, the part, whole, or percentage).
- Click the Calculate button.
- The calculator will display the result (the missing value) automatically.
What is the percentage change formula?
The percentage change formula is (New - Original) / Original × 100. Example: Original = 80, New = 100: (100 - 80) / 80 × 100 = 25%.
How do I find the original number given a percentage?
To find the original number when you know a percentage and its value:
- Convert the percentage to a decimal.
- Divide the known value by this decimal.
Example: 10 is 20% of what number?
- 20% = 0.20
- Original = 10 / 0.20 = 50.
Why should I use an online percentage calculator?
An online percentage calculator saves time and reduces errors. It automatically applies the correct formulas, so you don't have to do the math manually. This ensures quick and accurate results for tasks like calculating discounts, taxes, or statistics.