Calculator 1
Percentage Calculator
Enter any two values and leave the value you want to find empty.
Result
Enter any two values above
Example: 20% of 150 = 30
Free Instant • Browser-based • No sign-up
Percentage Calculator
Calculate percentages, percentage difference, and percentage increase or decrease in seconds. Four practical calculators in one clean, mobile-friendly tool.
⚡ Instant answers
🧮 4 calculator types
📱 Mobile friendly
🔒 No data upload
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Percentage toolkit
Choose what you want to calculate
Enter the values you know. Results include the answer and the formula used.
Calculator 2
Percentage Calculator in Common Phrases
Use the wording that matches the question you already have.
Calculator 3
Percentage Difference
Compare two values without treating either one as the starting value.
Percentage difference—|V1 − V2| ÷ |(V1 + V2) ÷ 2| × 100
Calculator 4
Percentage Change
Calculate an increase or decrease. Enter any two values and leave the third blank.
ResultEnter any two valuesIncrease: V × (1 + P/100) • Decrease: V × (1 − P/100)
Convenience
Recent calculations
Saved only in this browser so you can quickly refer back to recent answers.
Your recent calculations will appear here.
Percent of a number
To find P% of a value, convert P to a decimal by dividing by 100, then multiply by the value.
Percentage difference
Use percentage difference when comparing two values and neither value is specifically the original or baseline.
Percentage change
Use percentage change when one value is the starting point and the other is the new value after an increase or decrease.
Quick guide
How percentage calculations work
A percentage expresses a quantity as a fraction of 100. For example, 25% means 25 out of every 100, which is the same as 0.25 in decimal form.
Example: To calculate 20% of 150, use 150 × 20 ÷ 100 = 30. To find what percentage 30 is of 150, use 30 ÷ 150 × 100 = 20%.
The calculators above accept decimal values and negative values where the underlying formula permits them. Very large or very small results are formatted for readability without changing the calculation itself.
FAQ
Percentage calculator questions
How do I calculate 15% of a number?
Multiply the number by 15 and divide by 100. For 15% of 200: 200 × 15 ÷ 100 = 30.
How do I work out what percentage one number is of another?
Divide the first number by the second and multiply by 100. If 45 out of 60 items are complete, 45 ÷ 60 × 100 = 75%.
What is the difference between percentage difference and percentage change?
Percentage difference compares two values symmetrically. Percentage change treats one value as the starting value and measures how far the new value has moved from it.
Can I use decimal numbers?
Yes. All four calculators accept decimal inputs. You can also paste numeric values directly into the fields.