Percentage Calculator
Quickly calculate the percentage of any number for school, budgeting, shopping, or general math purposes.
Use this page for quick percentage calculations
% of15.00
is what % of50.00 %
What is the percentage change?
FromTo100.00 %
Quickly add or subtract percentages
%110.00
How Percentages Work 🔢
Percentages represent parts of 100, making them useful for comparing values, calculating increases/decreases, and understanding proportions.
They’re widely used in finance, shopping discounts, grades, statistics, and everyday calculations.
Key Facts
- Percent means 'per hundred'.
- A percentage can be converted to a decimal by dividing by 100.
- Percentages are used to express ratios, changes, and comparisons in a standardized way.
Formulas
- Percentage of a Total
Part = Total × (Percentage ÷ 100)- Use this to find a portion of a total value. - Percentage of One Number Relative to Another
Percentage = (Part ÷ Total) × 100- Use this to determine what percent one number is of another. - Percentage Change
Percentage Change = ((New − Old) ÷ Old) × 100- Use this to calculate increases or decreases between two values. - Quick Add/Subtract Percentages
New Value = Original × (1 ± Percentage ÷ 100)- Quickly add or subtract a percentage from a value.
Practical Examples
- 15% of 100 = 15
- 50 is what % of 100 = 50%
- From 100 to 200 → Percentage change = 100%
- 100 + 10% = 110, 100 − 10% = 90
FAQs
What is a percentage?
A percentage is a number or ratio expressed as a fraction of 100.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, then multiply by 100.
Can percentages be greater than 100?
Yes, percentages can exceed 100% if the part is greater than the whole.