Percentage Calculator
Quickly compute percentages, percentage increases, and percentage differences
1. What is X% of Y?
What is
% of
=
30
2. X is what percentage of Y?
is what % of
=
12.5%
3. Percentage Increase / Decrease
From
to
=
+50%
How to Use This Percentage Calculator
- Calculate Percentage of a Value: Enter the percentage ($X$) and total amount ($Y$) to find the portion size.
- Determine Proportional Percentage: Enter a part ($X$) and total ($Y$) to find what fraction percentage $X$ represents.
- Measure Percentage Change: Enter an initial value ($V_1$) and final value ($V_2$) to evaluate percentage growth or decrease.
Percentage Formulas
Common percentage calculations utilize simple mathematical ratios:
Part of Total = (Percentage / 100) × Total
Percentage Share = (Part / Total) × 100
Percentage Change = [ (Final Value – Initial Value) / Initial Value ] × 100
Percentage Share = (Part / Total) × 100
Percentage Change = [ (Final Value – Initial Value) / Initial Value ] × 100
Frequently Asked Questions (FAQ)
How do I calculate a discount percentage on a purchase?
Multiply the original price by the discount percentage and divide by 100. Subtract this value from the original price to determine the sale total.
What is the difference between percentage and percentage points?
A percentage measures relative change (e.g., an increase from 10% to 15% is a 50% relative increase), while percentage points measure simple numerical difference (5 percentage points higher).