Tool guide
How to use the Percentage Calculator
Use the Percentage Calculator to find percentages, percentage change, increases, decreases, and parts of a whole for shopping, math, reports, budgeting, and quick comparisons.
What this tool is useful for
- calculate a sale discount or price increase
- work out what percentage one number is of another
- compare growth, change, or progress over time
Practical example
Example: if a price goes from $80 to $100, the increase is $20, which is a 25% increase from the original price.
How the result is created
Percentage calculations compare a part to a whole, usually by dividing the part by the whole and multiplying by 100. Percentage change compares the difference between two values against the starting value.
Common mistakes and helpful tips
- Use the original number when calculating percentage increase.
- Do not confuse percentage points with percent change.
- Round only after the final calculation.
Related tools and next steps
Discount Calculator, Tip Calculator, Ratio Calculator, Calculators, All Tools