🧮 12-in-1 Percentage Calculator

Calculate, Compare, Margin, Fractions & More

1. What is X% of Y?

Percentage (%)

Of Number

2. X is What % of Y?

Number (X)

Of Number (Y)

3. Percentage Increase

Original Value

New Value

4. Percentage Decrease

Original Value

New Value

5. Percentage Difference

Value 1

Value 2

6. Add Percentage (Tax)

Number

Add %

7. Subtract Percentage

Number

Subtract %

8. Reverse (Find Original)

Final Value

Included %

9. Fraction to Percentage

Numerator (Top)

Denominator (Bottom)

10. Percent of Percent

First %

Second %

11. Orig Price (Before Sale)

Sale Price

Discount % Was

12. Profit Margin

Cost

Revenue (Sale)

📚 Comprehensive Formula Guide

Below are the mathematical formulas used in our 12 calculators. Understanding these will help you master percentage math manually.

1. Fraction to Percentage

Percentage = (Numerator ÷ Denominator) × 100

Example: 3/4 = (3 ÷ 4) × 100 = 0.75 × 100 = 75%

2. Percentage of a Percentage

Result = (Percent1 ÷ 100) × (Percent2 ÷ 100) × 100

Example: 20% of 50% = 0.20 × 0.50 = 0.10 = 10%

3. Find Original Price (Before Discount)

Original = Sale Price ÷ (1 - (Discount% ÷ 100))

Example: Paid $80 after 20% off.
$80 ÷ (1 - 0.20) = $80 ÷ 0.80 = $100

4. Profit Margin

Margin % = ((Revenue - Cost) ÷ Revenue) × 100

Example: Cost $100, Sold for $150.
(50 ÷ 150) × 100 = 33.33% Margin

❓ Frequently Asked Questions (7)

1. How do I calculate a percentage of a number? ▼

Convert the percentage to a decimal (divide by 100) and multiply it by the number. Example: 25% of 200 = 0.25 × 200 = 50.

2. What is the difference between Margin and Markup? ▼

Markup is based on Cost (Cost + Markup = Price). Margin is based on Revenue (How much of the sale price is profit). A 50% Markup equals a 33.3% Margin.

3. How do I find the original price after a discount? ▼

Use Calculator #11. Divide the price you paid by the decimal form of what you paid. If you got 20% off, you paid 80% (0.80). So, Price / 0.80 = Original.

4. Can a percentage increase be higher than 100%? ▼

Yes! If a value doubles, it is a 100% increase. If it triples, it is a 200% increase. There is no upper limit to percentage increase.

5. What is a percentage point vs percentage? ▼

A percentage point is the simple arithmetic difference. If a rate goes from 4% to 6%, it rose by 2 percentage points, but it is a 50% percentage increase.

6. How do I turn a fraction into a percentage? ▼

Divide the top number (numerator) by the bottom number (denominator) and multiply the result by 100.

7. What is the formula for reverse tax calculation? ▼

Use Calculator #8. Formula: Total Amount / (1 + TaxRate). Example: $107 with 7% tax. $107 / 1.07 = $100.