Percentage Calculator
Instantly calculate percentage equations, discounts, tax margins, and growth rates without struggling with math formulas.
What is X% of Y?
Find a specific percentage of a number.
X is what percent of Y?
Find out what percentage one number is of another.
Percentage Change
Calculate the percentage increase or decrease from X to Y.
Add / Subtract Percentage
Add or subtract a percentage from a specific value.
How to Use the Percentage Calculator
Our free percentage calculator handles the most common percentage equations you encounter in daily life, finance, and business without struggling with math formulas.
- What is X% of Y: Find a specific portion of a total. E.g., a 20% tip on a $150 bill is $30.
- X is what percent of Y: Find the percentage ratio between two numbers. E.g., scoring 30 out of 150 means you scored 20%.
- Percentage Change: Calculate the exact percentage increase or decrease from a starting value to a final value.
- Add/Subtract a Percentage: Instantly apply sales tax or calculate a discount by adding or subtracting a percentage from a base price.
Mastering Percentage Calculations
Understanding percentages is crucial for everything from calculating discounts while shopping to analyzing business growth rates and investment returns.
The Basic Formula
At its core, a percentage is simply a ratio expressed as a fraction of 100. To find the percentage of a number, you multiply the number by the percentage fraction (e.g., 20% = 0.20).
Calculating Discounts
When a store offers '20% off', you are essentially paying 80% of the original price. Subtracting 20% from a $150 item leaves you with a final price of $120.
Tracking Growth
Percentage increase is vital for business. If your revenue goes from $50k to $75k, the increase is $25k. Divided by the starting $50k, that represents a 50% growth rate.
Taxes and Surcharges
Applying a 15% tax means you are calculating 115% of the base price. Our Add/Subtract tool handles this instantly without requiring complex mental math.
Key Highlights
Whether you are a student grading a test, a shopper calculating sales tax, or an investor tracking portfolio growth, our client-side percentage tools provide instant accuracy.
Everyday Math, Simplified
Understand the core mechanics and boost your knowledge with our professional tools.
Expert FAQs
Everything you need to know about this tool.
Q: How do I calculate a percentage difference?
First, find the absolute difference between the two numbers. Then divide that difference by the initial number and multiply by 100 to get the percentage.
Q: Is 20% of 50 the same as 50% of 20?
Yes! Due to the commutative property of multiplication, X% of Y is always equal to Y% of X. Both 20% of 50 and 50% of 20 equal 10.
Q: Why did my percentage decrease calculation output a negative number?
If your final value is smaller than your initial value, the mathematical change is negative. Our calculator handles this by showing it explicitly as a 'Decrease'.