Percentage Calculator
Four calculation modes — results update instantly as you type.
30
15% of 200 = 30
15%
30 is 15% of 200
+25%
80 → 100 = 25% increase
110
100 + 10% = 110
90
100 − 10% = 90
How to Calculate Percentages
Percentages are one of the most common calculations in everyday life — from discounts and tips to tax rates and exam scores. Our calculator handles four types of percentage calculation instantly, with results that update as you type.
How do I calculate a percentage?
To find X% of Y, multiply Y by X/100. For example, 15% of 200 = 200 × 0.15 = 30.
How do I calculate percentage increase?
((New - Original) / Original) × 100. From 80 to 100 = 25% increase.
What is the formula for percentage change?
((New Value - Old Value) / Old Value) × 100. Positive = increase, negative = decrease.
