Percentage Calculator
Calculate percentage of a number, percentage increase and decrease, discounts, and proportions instantly with clear formulas. 100% private in-browser math.
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Calculate percentages with visible steps
Enter the two values for a percentage, discount or change calculation and read the formula beside the result. For example, 15% of 80 is 12, while increasing 80 by 15% gives 92. These are different questions, so choose the mode that matches the decision you are making.
How It Works
Calculating percentages is essential for retail discounts, sales tax, financial returns, and grade evaluations. Pexlii provides a multi-mode percentage calculator that solves every common percentage calculation instantly in your browser. Our tool is built with four dedicated calculation engines: (1) finding X percent of Y, (2) determining what percentage X represents of Y, (3) calculating percentage change between an old and new value, and (4) adding or subtracting a percentage markup or discount. Each engine executes using high-precision floating-point arithmetic with instant two-decimal-place rounding. As you type numbers into any input field, the calculator recomputes results in real time with zero button presses or page reloads. Everything is evaluated locally on your device without sending financial or business figures across the internet.
🔒 Your files and entered content are processed on this device and are not uploaded by this tool. Pexlii also loads Google Analytics for usage measurement; tool events include the tool name, category, and action type, not your files or entered content.
How to Use Percentage Calculator
Select the percentage calculation formula you need:
1. "What is X% of Y?" (Standard percentage)
2. "X is what percent of Y?" (Proportion)
3. "Percentage Increase or Decrease from X to Y"
Enter your numbers to see the calculated result and step-by-step mathematical breakdown instantly.
Key Capabilities
Application Scenarios
Technical Constraints
Frequently Asked Questions about Percentage Calculator
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Actual Size Online Ruler
Calibrated on-screen ruler in centimeters, millimeters, and inches.