Percentage Calculator

Calculate percentages, percentage increase, decrease, and percentage differences with step-by-step explanations. Perfect for students, professionals, and everyday calculations.

🧮 Percentage Calculator

Choose calculation mode and enter values

Basic Percentage Calculation

Calculate what percentage of a number equals another number. Example: What is 25% of 200?

Percentage Increase/Decrease

Calculate the percentage change between two values. Shows increase or decrease percentage.

Find What Percentage

Find what percentage one number is of another. Example: 50 is what percentage of 200?

Reverse Percentage Calculation

Find the original number when you know the percentage and result. Example: 25% of what number is 50?

Percentage Difference

Calculate the percentage difference between two numbers relative to their average.

📊 Calculation Results

Detailed breakdown with step-by-step explanation

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🔧 How to Use the Percentage Calculator

1
Choose Calculation Mode
Select the type of percentage calculation you need: Basic percentage, percentage change, find percentage, reverse calculation, or percentage difference. Each mode is designed for specific calculation scenarios.
2
Enter Your Values
Input the numbers in the appropriate fields. The calculator accepts whole numbers, decimals, and negative values. Each field has clear labels explaining what value to enter.
3
Get Instant Results
Results are calculated automatically as you type. View the answer along with step-by-step calculations showing exactly how the result was obtained using mathematical formulas.
4
Understand the Process
Review the detailed explanation and visual representation. The calculator shows the formula used, calculation steps, and a progress bar to help you understand the percentage concept visually.

❓ Frequently Asked Questions

What is the difference between percentage increase and percentage difference? +
Percentage increase compares the change from an original value to a new value, showing how much the original value has grown or decreased. It uses the original value as the base. Percentage difference compares two values relative to their average, showing the relative difference between them without considering which is the "original" value. Use percentage increase for before/after comparisons and percentage difference for comparing two independent values.
How do I calculate what percentage one number is of another? +
To find what percentage one number is of another, divide the first number (part) by the second number (whole) and multiply by 100. The formula is: (Part ÷ Whole) × 100 = Percentage. For example, to find what percentage 25 is of 100: (25 ÷ 100) × 100 = 25%. Use our "Find %" mode for this calculation type.
Can I calculate percentages with decimal numbers? +
Yes, our calculator handles decimal numbers with high precision. You can enter values like 12.5, 0.75, or 99.99 in any field. The calculator maintains accuracy up to several decimal places and rounds the final result appropriately. This is useful for financial calculations, scientific measurements, and precise statistical analysis.
What does the reverse percentage calculation do? +
Reverse percentage calculation finds the original number when you know the percentage and the result. For example, if you know that 20% of some number equals 40, the reverse calculation finds that the original number is 200. The formula is: Original Number = Result ÷ (Percentage ÷ 100). This is useful for finding original prices before discounts, total amounts before tax deductions, or base values in various scenarios.
How accurate are the percentage calculations? +
Our calculator uses JavaScript's built-in mathematical functions, providing high precision for most practical purposes. Results are accurate to many decimal places, with appropriate rounding for display. For financial or scientific applications requiring extreme precision, consider the limitations of floating-point arithmetic. The calculator handles typical percentage calculations with more than sufficient accuracy for business, academic, and personal use.
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