Percentage Calculator
Free percentage calculator. Calculate percentage of total, percentage change, percentage increase/decrease, and more.
%
50
Common Percentages
10%
= 1/10
15%
= 1/7
20%
= 1/5
25%
= 1/4
33.33%
= 1/3
50%
= 1/2
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Last updated: January 2026
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Frequently Asked Questions
How do I calculate a percentage of a number?
To find a percentage of a number, multiply the number by the percentage and divide by 100. For example, to calculate 25% of 200: multiply 200 by 25 to get 5000, then divide by 100 to get 50. The formula is: Result = (Number × Percentage) ÷ 100. You can also convert the percentage to a decimal first (25% = 0.25) and multiply directly: 200 × 0.25 = 50.
How do I calculate percentage increase or decrease?
To find percentage change, subtract the original value from the new value, divide by the original value, and multiply by 100. Formula: ((New - Original) ÷ Original) × 100. For example, if a price increases from $80 to $100: ((100 - 80) ÷ 80) × 100 = 25% increase. If it decreases from $100 to $80: ((80 - 100) ÷ 100) × 100 = -20% decrease.
What is the formula to find what percentage one number is of another?
To find what percentage A is of B, divide A by B and multiply by 100. Formula: (Part ÷ Whole) × 100 = Percentage. For example, if you scored 45 out of 60 on a test: (45 ÷ 60) × 100 = 75%. This works for any scenario where you need to express a portion as a percentage of a total.
How do I calculate the original price before a discount?
To find the original price before a percentage discount, divide the sale price by (1 minus the discount percentage as a decimal). Formula: Original = Sale Price ÷ (1 - Discount%). For example, if an item costs $75 after a 25% discount: $75 ÷ (1 - 0.25) = $75 ÷ 0.75 = $100 original price.
What is the difference between percentage change and percentage difference?
Percentage change measures the relative change from an original value to a new value, using the original as the base. Percentage difference compares two values without treating either as the baseline—it uses the average of both values as the base. Use percentage change when tracking growth (like salary increases), and percentage difference when comparing two independent values (like prices at two stores).