BoltToolBox
Tools
About
Contact
Privacy
Terms
Tools
About
Contact
Privacy
Terms
Percentage Calculator
Calculate percentages, percentage change, and percentage of amounts
What is X% of Y?
X is what % of Y?
Percentage Change
Percentage Increase
What is X% of Y?
Percentage (X%)
Number (Y)
Calculate
Result
X is what % of Y?
Number (X)
Total (Y)
Calculate
Result
Percentage Change
Original Value
New Value
Calculate
Result
Increase/Decrease by Percentage
Original Value
Percentage
+
-
Calculate
Result
Common Calculations
10% of 500
= 50
25% of 200
= 50
15% of 80
= 12
5% of 1000
= 50
Percentage Facts
50% = 0.5 in decimal form
100% = 1.0 in decimal form
To find X% of Y: (X/100) × Y
Percentage change: ((New - Old) / Old) × 100
Percentage Tips
• "What is X% of Y?" finds the percentage of a number
• "X is what % of Y?" finds what percentage one number is of another
• Percentage change shows increase/decrease between two values
• Use the quick calculation buttons for common scenarios
• All calculations support decimal values for precision