Percentage Calculator
Calculate percentages, percentage increase or decrease, percentage change, original values and values after adding or subtracting a percentage.
Percentage Calculation
Choose the type of percentage calculation and enter your values.
Quick Percentage Values
For the second number entered above, these common percentages are calculated automatically after you click Calculate.
Percentage Reference Table
See common percentage values calculated from the second input.
| Percentage | Calculation | Result |
|---|
What is a Percentage?
A percentage represents a number as a fraction of 100. The symbol % means “per hundred.” For example, 25% means 25 out of every 100, or 0.25 in decimal form.
How to Calculate a Percentage of a Number
Percentage ÷ 100 × Number
What is 20% of 500?
20 ÷ 100 × 500
= 0.20 × 500
= 100
How to Find What Percentage One Number is of Another
Part ÷ Total × 100
40 ÷ 200 × 100
= 20%
Percentage Increase Formula
Original Value × Percentage ÷ 100
New Value
Original Value + Increase Amount
Increase = ₹1,000 × 20%
= ₹200
New Value = ₹1,000 + ₹200
= ₹1,200
Percentage Decrease Formula
Original Value × Percentage ÷ 100
New Value
Original Value − Decrease Amount
Percentage Change Formula
(New Value − Old Value) ÷ Old Value × 100
Change = 600 − 500
= 100
Percentage Change:
100 ÷ 500 × 100
= 20% increase
How to Find the Original Value
If you know a final value after a percentage increase, you can work backwards to calculate the original value.
Final Value ÷ (1 + Percentage ÷ 100)
Original Value
= 1,200 ÷ 1.20
= 1,000
Where Percentage Calculations are Used
Percentages are commonly used for discounts, marks, exam scores, business growth, profit margins, interest rates, salary increases, price changes, taxes, investment returns, statistics and everyday financial calculations.
Note: This Percentage Calculator is intended for general, educational and mathematical calculations. Results are based on the values entered and may be rounded for display.