Percentage Calculator
Calculate percentages, percentage change, percentage increase, and percentage decrease easily.
1
What is P% of X?
Result:
30
Formula: (15 ÷ 100) × 200 = 30
2
X is what % of Y?
Result:
30%
Formula: (45 ÷ 150) × 100 = 30%
3
Percentage Increase / Decrease
Increase (+):
+25.00%
Difference: +20
4
Add or Subtract P% to X
+20% Added:
300.00
-20% Subtracted:
200.00
Adjustment amount: ±50.00
How to Use Percentage Calculator
- Select the calculation card that matches your question (e.g. What is P% of X, or Percentage Increase/Decrease).
- Enter your numbers into the input fields.
- The calculated answer and step-by-step formula update automatically in real-time.
- Click the copy icon to copy your result to the clipboard.
About this Tool
A versatile everyday math tool designed for financial calculations, discounts, tips, tax rates, test scores, school math, and percentage growth tracking.
Frequently Asked Questions
Common questions about Percentage Calculator, accuracy, and browser-side security.
Multiply the number by the percentage, then divide by 100. For example, 20% of 150 is (20 × 150) ÷ 100 = 30.
Subtract the initial value from the new value, divide by the initial value, and multiply by 100: ((New - Old) ÷ Old) × 100.
Yes, decimal inputs and negative percentages or differences are fully supported.
Yes, completely free with no usage limits or sign-up needed.