Percentage Calculator
Four percentage modes in one tool: find a percentage of a number, calculate percentage change between two values, determine what percentage one number is of another, or apply a markup/discount to a price.
Percentage Formulas
% of a number: result = (A / 100) × B
% change: result = ((B − A) / |A|) × 100
X is ?% of Y: result = (X / Y) × 100
Markup/Discount: result = A + (A × B / 100)
| Mode | Example |
|---|---|
| % of a number | 15% of 200 = 30 |
| % change | 80 → 100 = +25%; 100 → 80 = −20% |
| X is ?% of Y | 30 is 25% of 120 |
| Markup/Discount | $50 × +20% = $60; $50 × −20% = $40 |
How to use
% of a number
Find X% of Y. Example: What is 15% of 200? Enter 15 in the first field and 200 in the second — result is 30.
% change
Calculates percentage increase or decrease between two values. Example: price went from 80 to 100 — enter 80 then 100, result is +25%. A negative result means a decrease.
What % is X of Y?
Finds what percentage the first number is of the second. Example: 30 is what % of 120? Answer: 25%.
Markup / Discount
Applies a percentage markup to a base price. Example: $50 with 20% markup = $60. For a discount, enter a negative percentage.
Formula
% of: result = (A / 100) × B
% change: result = ((B - A) / |A|) × 100
X is ?% of Y: result = (X / Y) × 100
Markup: result = A + (A × B / 100)
Tips
- •For discounts, use the markup mode with a negative percentage, e.g. −20 for a 20% discount.
- •% change shows a negative value when the new number is lower than the original.
- •Combine this with the loan calculator to understand interest rates as percentages.