Math
Percentage Calculator: Master Percentages
Calculate percentages, percentage change, and solve common problems.
Percentages are everywhere: tax, tips, interest, discounts.
What Is a Percentage?
A fraction of 100. 25% = 0.25.
Common Calculations
- X% of Y: Y × X/100
- X is what % of Y: (X/Y) × 100
- % change: ((New-Old)/Old) × 100
Tips and Discounts
15% tip on $40 = $6. 20% off $100 = $80 final.
Frequently Asked Questions
Calculate % increase?
((New - Old) / Old) × 100.
Percent vs percentage point?
Percent is relative. Point is absolute. 5%→7% = 2 points, 40% increase.
Reverse a percentage?
Divide by (1 + rate). $120 after 20% = $100.