01
Pick a mode
Choose between percent-of, ratio, or percentage add/subtract.
Math calculator
Percentage Calculator
Switch between percentage-of, ratio, and percentage adjustment modes in one page.
Enter two values and choose the percentage operation you need.
How to use the percentage calculator
Choose the mode you need, enter two values, and read the result in one place.
02
Enter the values
Fill in the base numbers and the percentage when needed.
03
Read the result
The tool shows both the number and a short explanation.
Best use cases
Useful for discounts, price increases, ratios, and everyday budget checks.
Discount math
Quickly calculate the new amount after a discount.
Ratio checks
See what percent one value represents of another.
Budget planning
Add or remove a percentage from a value without mental math.
Percentage example
Handy for fast price and ratio checks.
Percentage example
Setup
Value: 250 Percentage: 20
Output
20% of 250 is 50.
Handy for fast price and ratio checks.
Percentage calculator FAQ
What does each mode do?
The first mode finds a percentage of a number, the second finds a ratio, and the third adds or subtracts a percentage.
Why can the result be decimal?
Some percentage calculations do not divide into whole numbers cleanly.
Can I use negative values?
Yes, though most everyday uses make more sense with positive values.