Percentage Calculator
X% of Y, increase/decrease, % change & difference, reverse %, VAT, and tip split — with quick picks & steps.
Result
Calculation steps & formulas
About this percentage calculator
Includes the most common percentage operations with clear steps: of, increase/decrease, change & difference, reverse %, VAT add/remove, and tip split. All calculations run locally and respect your locale’s number formatting.
What can this percentage calculator do?
X% of Y, increase/decrease, % change, % difference, reverse %, VAT add/remove, and tip split — with quick picks and clear steps.
How do I calculate X% of Y?
Choose What is X% of Y?, enter X and Y, and the app computes Y × (X/100) instantly with your locale’s separators.
What’s the difference between % change and % difference?
% change is directional: ((B − A) / A) × 100.
% difference is symmetric: |A − B| / ((A + B)/2) × 100.
How does reverse percentage work?
Before a decrease: Original = Final / (1 − p/100).
Before an increase: Original = Final / (1 + p/100).
Can I add or remove VAT?
Add: Total = Amount + Amount × (rate/100) •
Remove: Pre-tax = Amount / (1 + rate/100).
The calculator also shows intermediate steps.
Is it private?
Yes. Everything runs locally in your browser. Favorites and recents are saved privately using localStorage.
Last updated: October 20, 2025