Daily life calculator
Standalone tool pagePercentage Calculator
Calculate percentages, percentage increase/decrease, and what percent one number is of another.
Results
Value as percentage of base
Percentage increase/decrease
Absolute change
How It Works
A percentage expresses a number as a part of 100. To find what percent A is of B, divide A by B and multiply by 100. To find percentage change, subtract the old value from the new value, divide by the old value, then multiply by 100.
Example
If 25 is compared with 200, then 25 ÷ 200 × 100 = 12.5%. If a price moves from 100 to 120, the absolute change is 20 and the percentage increase is 20%.
Common percentage tasks
- Find what percent one number is of another.
- Calculate increase or decrease from an old value to a new value.
- Check shopping discounts, tax rates, grade changes, and business ratios.
- Compare two scenarios using the same base number.
Avoid common mistakes
- Do not divide by zero when looking for a percent of a base.
- Separate percentage points from relative percentage change.
- Use the same units for both numbers before calculating.
- Round only after the final result if precision matters.
Frequently Asked Questions
Can this calculate discounts?
Yes, but the dedicated discount calculator gives a clearer sale price, savings, and optional tax or fee result.
What if the base is zero?
Division by zero is undefined. This calculator returns 0 for that part so the page stays usable, but you should change the base to a non-zero value for a meaningful percentage.
What is percentage change used for?
Percentage change is useful for price changes, growth rates, score changes, business metrics, and comparing before-and-after values.
Is percentage point the same as percent?
No. Moving from 10% to 15% is a 5 percentage-point increase, but it is a 50% relative increase from the original 10%.