Percentage Calculator
Calculate percentages instantly — find percent of a number, percentage change, discounts, reverse percentages, and more.
Find what percentage one number is of another.
Find the value of a percentage of a number.
Calculate the percentage increase or decrease between two values.
Calculate the final price after a percentage discount.
Find the original price before a discount was applied.
Understand the difference between percentage points and percent change.
Visual result will appear here after calculation.
Formulas & How It Works
X is what % of Y?
(X ÷ Y) × 100
Example: 30 is what % of 200? → (30 ÷ 200) × 100 = 15%
What is X% of Y?
(X ÷ 100) × Y
Example: What is 15% of 200? → (15 ÷ 100) × 200 = 30
% Change
((New − Old) ÷ Old) × 100
Example: 120 → 150: ((150 − 120) ÷ 120) × 100 = +25%
Discount
Price × (1 − Discount% ÷ 100)
Example: 8000 with 20% off → 8000 × 0.80 = 6400
Reverse %
Final Price ÷ (1 − Discount% ÷ 100)
Example: 6400 after 20% off → 6400 ÷ 0.80 = 8000
% Points vs % Change
Points = New% − Old%
Change = ((New% − Old%) ÷ Old%) × 100
Example: 10% → 12%: +2 points, +20% change
Common Use Cases
Quickly figure out sale prices and how much you save.
Calculate the percentage increase of a pay raise.
Convert raw scores to percentages for grades.
Track revenue, profit, or user growth rates.
Understand daily value percentages on food packages.
Calculate tax amounts, restaurant tips, or service fees.
Frequently Asked Questions
What is the formula for calculating a percentage?
To find what percent X is of Y, use: (X ÷ Y) × 100. For example, 30 out of 200 is (30 ÷ 200) × 100 = 15%.
How do I calculate percentage increase?
Use the formula: ((New Value − Old Value) ÷ Old Value) × 100. A positive result means increase, negative means decrease.
What is the difference between percentage points and percent change?
Percentage points measure the absolute difference between two percentages (e.g. 10% to 12% = 2 points). Percent change measures the relative change (e.g. 10% to 12% = 20% increase).
How do I calculate a discount price?
Multiply the original price by (1 − discount/100). For 20% off of 8000: 8000 × 0.80 = 6400.
Can I use decimal numbers?
Yes. All calculators on this page accept decimal numbers (e.g. 12.5% or 99.99).
What happens if the original value is zero?
Division by zero is undefined in mathematics. The calculator will display a validation message instead of a broken result.