Percentage Calculator
Calculate percentage increase, decrease, proportion, discount, and taxes instantly with step-by-step mathematical breakdowns.
What is X% of Y?
X is what % of Y?
Percentage change from X to Y?
Add or Subtract X% from Y
π‘ Percentage Calculation Formulas & Real-Life Applications
Commercial & Financial Mathematics
Accurate percentage calculations are fundamental to e-commerce discounts, sales tax, inflation tracking, and loan margins. Our tool computes all modes with floating-point precision.
Relative Growth & Decline
To calculate relative changes over time, apply (New - Old) / Old Γ 100. Positive outcomes denote percentage growth, while negative figures represent depreciation.
β Frequently Asked Questions
Are percentage calculations rounded or exact?
Calculations use high-precision floating-point arithmetic to compute exact values, formatted up to 4 decimal places for clean readability.
Which mode should I use for sales tax and discount calculations?
For tax additions or retail discounts, use Mode 4 (Add/Subtract Percentage) to instantly find final discounted or taxed totals.