100% Free · Real-Time Calculation
Percentage Calculator
Solve percentage problems instantly: find percentages of numbers, calculate percentage changes, and compute discounts and tax.
Percentage of ValueFormula: (P / 100) × Total
What is
%
of?Result
37.50
Percentage RatioFormula: (Part / Total) × 100
is what % of?
Result
25.00%
Percentage ChangeFormula: ((To - From) / From) × 100
Fromto
Percentage Increase
+50.00%
Discount & Tax CalculatorAdd or Subtract %
%
Final Amount (Save $40.00)
$159.99
Common Percentage Formulas
What is P% of X?
Result = (P / 100) × X
Example: 15% of $250 = (15 / 100) × 250 = $37.50
X is what % of Y?
Percentage = (X / Y) × 100
Example: 35 is what % of 140 = (35 / 140) × 100 = 25%
Percentage Change
% Change = ((To - From) / From) × 100
Example: From 80 to 120 = ((120 - 80) / 80) × 100 = +50%
Frequently Asked Questions
How do I calculate a discount?
Use Card 4 (Discount & Tax Calculator): enter the original item price, select '-' (Off), and type the discount percentage (e.g. 20%). The tool outputs both your total savings and final checkout price.
Can I use negative numbers or decimals?
Yes! All inputs accept floating-point decimals and negative integers.