Percentage Calculator
The most intuitive tool for daily math. Calculate parts, percentage change, and ratios with professional precision and real-time feedback.
Mastering the Math: The Definitive Guide to Percentages
"Percentage skills are hidden in every professional decision, from venture capital to grocery shopping." For investment returns, try our ROI Calculator.
Absolute Accuracy
Precision up to 4 decimal places for scientific and financial applications.
Zero Latency
Instant real-time calculations. No buttons, no waiting, just immediate answers.
Session History
Track the last 10 calculations to compare trends and growth stats easily.
1. Calculating a 'Part' of the Whole
This is the most common percentage task. If you want to find 15% of $85.00, we simply multiply the total by the decimal version of the percentage (0.15). Our calculator handles the conversion for you, making it ideal for calculating sales tax, restaurant tips, or interest payments.
Pro Tip: The Commutative Property
Did you know that 8% of 50 is exactly the same as 50% of 8? Both equal 4. This handy mental shortcut can help you verify our calculator's results in your head!
2. Understanding Percentage Change
Many people confuse "percentage points" with "percentage change." If a tax rate increases from 10% to 15%, that is a **5 percentage point** increase, but actually a **50% total increase** in tax. Our Percentage Change tool helps you avoid this common linguistic trap in financial reporting.
Price Reductions
If an item drops from $200 to $150, that's a 25% decrease. Use this to verify "On Sale" claims by retailers.
Growth Analysis
If your website traffic grows from 1,000 to 1,500 visitors, that's a 50% increase. Perfect for SEO reporting.
Frequently Asked Questions
Q: How do I calculate 10% off?
Enter the original price and 10 in the Basic Calculator. The result is what you save. Subtract it from the original to get your final price.
Q: What is percentage increase vs decrease?
An increase happens when the new value is larger than the old. A decrease happens when it's smaller. Our tool highlights this with Green and Red colors automatically.
Q: Why use percentage instead of fractions?
Percentages use a universal base of 100, making it easier to compare data like 7/8 vs 11/12 (87.5% vs 91.7%).