Percentage Calculator – Calculate Any Percentage Instantly
Calculate percentages, percentage change, percentage of a number, and what percent one number is of another. Three calculators in one.
📊 Math📐 X% of Y = X/100 × Y | % Change = (New-Old)/Old × 100
What is % of?
…of this number
Please enter valid values.
Formula & Reference
| Variable | Formula | Units |
|---|---|---|
| Percentage Calculator – Calculate Any Percentage Instantly | X% of Y = X/100 × Y | % Change = (New-Old)/Old × 100 | % |
Step-by-Step Examples
Example 1
15% of 200
15% of 200 = 30.
- 15/100 × 200 = 30
✓ 30
Example 2
What % is 45 of 180?
45 is 25% of 180.
- 45/180 × 100 = 25%
✓ 25%
Example 3
% Change
From 80 to 100: (100-80)/80 × 100 = 25% increase.
- 25% increase
✓ 25% increase
Real-World Applications
Students
Calculate any percentage quickly.
Shoppers
Find sale prices and discounts.
Finance
Calculate tips, taxes, and interest.
Business
Work out margins and percentage changes.
Common Mistakes to Avoid
⚠️
Percentage vs percentage point
A rise from 10% to 15% is a 5 percentage point increase but a 50% relative increase.
⚠️
% of vs % off
15% of $200 = $30. 15% off $200 = $200 - $30 = $170.
Frequently Asked Questions
How to calculate percentage? ▾
Percentage = (Part/Whole) × 100. What is 15% of 200? 15/100 × 200 = 30.
How to calculate percentage change? ▾
% Change = (New - Old) / Old × 100. From 80 to 100: (100-80)/80 × 100 = +25%.
How to find what percent one number is of another? ▾
Divide the part by the whole and multiply by 100. 45 is what % of 180? 45/180 × 100 = 25%.
Related Calculators
Formula Explorer connections
Interpretation: This relationship converts, summarizes or checks numerical quantities using standard arithmetic and measurement rules. Assumption: Use consistent units, preserve enough significant digits, and round only the final result unless the method states otherwise.