Percentage
MathAnswer the three percentage questions people ask most, with the right inputs for each one.
- What is X% of Y?
- What percentage is X of Y?
Inputs
Question mode and two values
Output
Percentage and absolute result
Open calculator
MathUpdated · Aug 2026
Percentage Increase/Decrease Calculator
Compare two values or apply a percentage change without losing the absolute difference.
Start with your numbers
Percentage Increase/Decrease Calculator
Change the inputs that matter to your decision. Optional assumptions stay collapsed until you need them.
Choose the direction of the calculation
Values
Percentage change
Change
50.00%
100 to 150 is a 50% increase.
Absolute change50.00
Multiplier1.5000×
(150 − 100) ÷ |100| × 100 = 50%
A negative percentage represents a decrease; the denominator for a comparison is the absolute original value.
/ 01 · FAQ
Frequently asked questions
Practical notes about the inputs, assumptions, and result.
This tool measures movement from an original value to a new value. The original value is the reference point, so reversing the order can change the result.
/ 02 · RELATED
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