Percentage Calculator
Calculate percentages, percentage increase or decrease, and find what percent one number is of another.
15% of 80 = (15 / 100) × 80 = 12
How to Use the Percentage Calculator
- Enter your parameters: Type, paste, or select your input values above.
- View instant results: Calculations update in real time as you change values.
- Copy or export: Click copy, download, or print to use your results immediately.
About this Tool
The Percentage Calculator is an essential everyday tool for calculating tips, markups, discounts, tax rates, test scores, and financial adjustments. Compute values instantly with step-by-step arithmetic explanations.
Percentage Calculator Formula & Logic
P = (Value / Total) * 100 or Amount = Total * (Percentage / 100)The Percentage Calculator is an essential everyday tool for calculating tips, markups, discounts, tax rates, test scores, and financial adjustments. Compute values instantly with step-by-step arithmetic explanations.
Worked Example: Percentage of a Number
15% of $80.00
$12.00
80 * 0.15 = 12
Frequently Asked Questions
How do I calculate a percentage increase?
Subtract the original value from the new value, divide the difference by the original value, and multiply by 100.
Is this calculator free and private?
Yes, all calculations run locally in your browser with zero data sent to external servers.
Calculation Standards
Calculations follow industry standards and standard US conventions. For tax, legal, or medical advice, consult certified professionals.
Related Practical Guide
Learn the exact mathematical formula to calculate percentage increase and decrease between two numbers. Includes worked financial examples, negative number handling, and Excel syntax.
Read tutorial →Understand how compound interest accelerates wealth accumulation. Discover the exact compounding formulas, how monthly compounding differs from annual, and how to project investment returns.
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