Percentage Calculator

Calculate Percentages Online

Percentages represent fractions out of 100, making it easy to compare values, calculate growth, and figure out proportional amounts. Our free online percentage calculator helps you calculate percentage values, percentage increases, percentage decreases, and proportional totals instantly.

How to Calculate a Percentage

The standard percentage formula compares a part to a whole:

$$\text{Percentage} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100$$

Calculation Example:

If a student scores 25 points out of a maximum 200 points on an exam:

$$\text{Percentage} = \left(\frac{25}{200}\right) \times 100 = 12.5\%$$

How to Use the Percentage Calculator

1. Select your calculation type: Choose whether you want to calculate a percentage of a number, percentage change, or percentage ratio.
2. Input your numbers: Enter the required values into the clear input boxes.
3. View instant output: The calculator displays exact percentage values immediately without needing to refresh the page.

What Can You Calculate?

• Percentage of a Value: Find out what a specific percentage of a total number equals (e.g., what is 15% of $80?).
• Percentage Increase: Work out the relative growth when a number goes up from its original value.
• Percentage Decrease: Determine the relative drop when a price or quantity decreases.
• Value Difference: Compare two numbers to find their relative percentage difference.

Percentage Increase and Decrease Formulas

Percentage Increase:

$$\text{Percentage Increase} = \left(\frac{\text{New Value} - \text{Original Value}}{\text{Original Value}}\right) \times 100$$

Percentage Decrease:

$$\text{Percentage Decrease} = \left(\frac{\text{Original Value} - \text{New Value}}{\text{Original Value}}\right) \times 100$$

Everyday Uses for Percentage Calculations

• Shopping Discounts: Calculate final sale prices during store promotions or clearance sales.
• Sales Tax & Tips: Figure out restaurant gratuities and local sales tax additions.
• Academic Grading: Convert test scores and assignment grades into standard percentage scores.
• Business Growth: Monitor quarterly revenue changes, website traffic growth, and conversion rates.

Frequently Asked Questions

How do I calculate a 20% discount on an item?

Multiply the original price by 0.20 to find the discount amount, then subtract that amount from the original price.

What is the difference between percentage and percentage point?

Percentage refers to proportional change relative to a starting value, while a percentage point measures the direct arithmetic difference between two percentages (e.g., going from 10% to 12% is a 2 percentage point increase or a 20% increase).