Calculate percentage of values, percentage growth, drops, discounts, and ratio conversions with live step-by-step mathematical formulas.
What is P% of X?
What is% of?
Result
36.00
Formula: (15 / 100) × 240 = 36
X is what % of Y?
is what % of?
Percentage
25.00%
Formula: (45 / 180) × 100 = 25%
% Increase / Decrease
FromTo
Change
+50.00% Increase
Formula: ((75 - 50) / 50) × 100
Discount & Final Price
Price ($/₹)Discount %
You Pay
$96.00
You Save: $24.00 (20% off)
How to Calculate Percentages (Formulas & Guide)
A percentage is a number or ratio expressed as a fraction of 100. It is denoted using the percent sign (%). Understanding percentages is fundamental for financial planning, exam grades, tax calculations, sales discounts, and data analysis.
Calculation Type
Standard Math Formula
Example
Percent of a Number
(P / 100) × Total
20% of 150 = 30
Percentage Ratio
(Part / Whole) × 100
25 out of 50 = 50%
Percentage Increase
((New - Old) / Old) × 100
$100 to $120 = +20%
Percentage Decrease
((Old - New) / Old) × 100
$100 to $80 = -20%
Frequently Asked Questions
Use the second calculator ("X is what % of Y?"). Enter the marks you scored in X and the total maximum marks in Y. For example, 450 out of 500 gives exactly 90.00%.
A percentage is an absolute ratio out of 100 (e.g., scoring 80% means answering 80 out of 100 questions correctly). A percentile is a relative ranking indicating the percentage of test-takers you scored higher than (e.g., the 99th percentile means you scored better than 99% of participants).
It takes the original retail price, computes the exact dollar savings by multiplying the price by the discount decimal, and subtracts that savings to give you the final out-of-pocket price.