Master the Math: The All-in-One Percentage Calculator
Percentages are the language of the modern world. Whether you are calculating a 20% tip at dinner, figuring out how much that 30% discount actually saves you, or analyzing year-over-year revenue growth, you need precision. Our Advanced Percentage Calculator is six tools in one, designed to handle every variation of percentage math instantly.
Which Calculator Do You Need?
Percentage math can be phrased in many confusing ways. Select the mode that matches your question:
- Simple Percentage: "What is 20% of 500?" Used for tips and basic discounts.
- Percentage Change: "My portfolio went from $100 to $150. What is the % growth?" This calculates the Increase or Decrease over time.
- Percentage Difference: "Company A charges $50, Company B charges $40. What is the % difference?" Used to compare two distinct values where neither is the "start" or "end."
- Reverse Percentage: "I paid $110 including 10% tax. What was the original price?" This helps you find the base value before a percentage was added or subtracted.
Formula Cheat Sheet
If you ever need to do this on paper, here are the formulas our tool uses:
- Percent of Value: (Percentage ÷ 100) × Value
- Percentage Change: ((New Value - Old Value) ÷ Old Value) × 100
- Percentage Difference: (|V1 - V2| ÷ ((V1 + V2) ÷ 2)) × 100
Frequently Asked Questions
What is the difference between "Change" and "Difference"?
Percentage Change implies a timeline (Old Value vs. New Value). Percentage Difference compares two separate things that exist at the same time (e.g., the height of two different buildings). In Difference calculations, the order of numbers doesn't matter.
How do I calculate a tip?
To calculate a 20% tip, you can just move the decimal point one place to the left to find 10% (e.g., $50.00 becomes $5.00), and then double it ($10.00). Or, just use the "Simple Percentage" mode on this tool!
Can percentages be negative?
Yes. A Percentage Change can be negative (e.g., -50%), which indicates a decrease or loss. However, a "Simple Percentage" of a positive number is always positive.