Percentage Calculator
Enter A and B (for example A=10 and B=20), and all 6 common percentage results below update together.
- Enter the first value in field A (for example, 100).
- Enter the second value in field B (for example, 25).
- Six common percentage calculations below update automatically with results, formulas, and steps.
Tip:Covers A of B%, A as % of B, reverse base, percentage change, A plus B%, and A minus B%.
When would you use this?
- Calculate the actual price after a discount
- Find how much sales grew compared to the previous period
- Convert exam scores into a percentage of the total
What do the six formula types represent?
They cover: percentage of A, what percent A is of B, reverse base calculation, percentage change, adding B%, and subtracting B% — the most common real-world scenarios.
What happens when the denominator is zero?
When a calculation requires dividing by zero, that formula type displays "Cannot calculate" without affecting the other results.
How many decimal places are shown?
Results are shown to two decimal places by default, which is sufficient for most everyday calculations.
Can I enter negative numbers or decimals?
Yes. Both A and B fields accept positive numbers, negative numbers, and decimals, with results updating in real time.
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