Percentage Calculator
Calculate various percentage operations including discounts, markups, percentage changes, and more. Perfect for students, shoppers, and business calculations.
Additional Information
Important Assumptions
This calculator uses standard mathematical percentage formulas and provides precise calculations.
It assumes standard percentage operations and may not account for rounding policies or specific business rules.
Frequently Asked Questions
How do I calculate a percentage of a number?
To calculate X% of Y: multiply Y by X/100. For example, 20% of 100 = 100 × 20/100 = 20. You can also convert the percentage to a decimal first: 20% = 0.20, then multiply: 100 × 0.20 = 20.
How do I find what percentage one number is of another?
To find what percentage X is of Y: divide X by Y, then multiply by 100. For example, (25 ÷ 100) × 100 = 25%.
How do I calculate percentage increase or decrease?
Percentage change = ((New Value - Old Value) ÷ Old Value) × 100. Positive is increase; negative is decrease.
What is compound percentage?
Compound percentage applies a percentage change multiple times: Final = Initial × (1 + r)^n.
How do I calculate percentage difference between two values?
Percentage difference = |V1 - V2| ÷ ((V1 + V2)/2) × 100.
How accurate is this percentage calculator?
The calculator uses standard percentage formulas and is mathematically accurate; adjust decimal places for precision.