Percentage Calculator
Calculate a percentage of a number, percentage change and percentage difference.
🔎 Calculate percentages, percentage change and difference
Choose the calculation you need: a percentage of a number, percentage increase or decrease, or percentage difference between two values.
Keeping each formula separate helps avoid confusing percentage change with percentage difference.
- Percent of a number.
- Percentage increase and decrease.
- Percentage difference between two values.
Worked examples and practical tips
The right formula depends on whether you want a part of a total, the change from an original amount, or a symmetric difference between two values. Follow a concrete example before trying your own inputs.
Find a percentage
20% of 250 = 50; an increase from 200 to 250 is 25%.
Find a percentage of an amount
To find 15 percent of 200, multiply by 0.15.
Percent increase
Compare the increase with the original value.
Percent difference
For two nonzero values, use their average as the denominator for a symmetric comparison.
Tip: Percentage change from an original value of zero is undefined. Percentage difference is not the same as percentage increase. Percentage change compares to the original value, not the final one.
💡 Calculation notes
Work out percentages, percentage change and what percent one number is of another. Includes straightforward examples for discounts and increases.
- Percentage of value = value × rate ÷ 100.
- Percentage change compares to the original value, not the final one.
- Percent of a number calculates an amount, not automatically a percentage.
- Percentage change compares a new value with the original value.
ℹ️ How to use
- Choose the correct mode: percentage of a number, percentage change or percentage difference.
- Enter the requested numbers. For a change, keep the original value in the original/old field.
- Calculate and check whether the result is an amount or a percent.