All-In-One Percentage Calculator
Calculate percentage values, percentage changes, shopping discounts, reverse percentages, and profit margins with step-by-step math formulas.
1. Calculate Percentage of a Number
Formula: (15 ÷ 100) × 200 = 30
2. Calculate Percentage Ratio
Formula: (25 ÷ 100) × 100 = 25%
3. Percentage Increase / Decrease
Formula: ((75 - 50) ÷ 50) × 100 = +50% (Increase of 25)
4. Add / Subtract Percentage (Tax, Tip, Markup)
10% of 100 is 10. Added: 110 | Subtracted: 90
5. Reverse Percentage (Find Original Value)
Formula: (45 ÷ 15) × 100 = 300
6. Shopping Discount & Final Price Calculator
7. Business Profit Margin & Markup Calculator
How Percentage Calculations Work
A percentage is a dimensionless ratio expressing a fraction of 100. It is denoted using the symbol "%". Percentage calculations are fundamental in finance, statistics, shopping, and everyday mathematics.
Percentage of Value Formula
P = (Percentage ÷ 100) × Total Value
Percentage Change Formula
% Change = ((New - Old) ÷ Old) × 100
Frequently Asked Questions
What is the difference between Profit Margin and Markup?
Profit Margin is the ratio of gross profit divided by the Selling Price, whereas Markup is gross profit divided by the Cost Price.
How do I calculate percentage discount manually?
To find the discount amount, multiply the original price by the discount percentage and divide by 100. Subtract this discount amount from the original price to get your final price.
How does reverse percentage calculation work?
Reverse percentage finds the original total before a percentage was taken. Divide your known part by the percentage value, then multiply by 100.