🔢 Percentage Calculator 2026
Work out percentages of numbers — All percentage calculations in one place
📐 What is X% of Y?
Formula: (X ÷ 100) × Y = Result
What is
% of
=
50
📊 X is what % of Y?
Formula: (X ÷ Y) × 100 = Percentage
is what % of
=
25%
📈 Percentage Increase
Formula: ((New - Old) ÷ Old) × 100
From
to
=
+25%
📉 Percentage Decrease
Formula: ((Old - New) ÷ Old) × 100
From
to
=
-25%
➕ Add X% to a Number
Formula: Y + (Y × X ÷ 100) = Result
Add
% to
=
120
➖ Subtract X% from a Number
Formula: Y - (Y × X ÷ 100) = Result
Subtract
% from
=
80
⚡ Quick Percentage Calculator
Calculate percentage of
Click a percentage above
Percentage Formulas
| Calculation | Formula | Example |
|---|---|---|
| X% of Y | (X ÷ 100) × Y | 25% of 200 = 50 |
| X is what % of Y | (X ÷ Y) × 100 | 50 is 25% of 200 |
| Percentage increase | ((New - Old) ÷ Old) × 100 | 80 to 100 = +25% |
| Percentage decrease | ((Old - New) ÷ Old) × 100 | 100 to 75 = -25% |
| Add X% to Y | Y × (1 + X/100) | 100 + 20% = 120 |
| Subtract X% from Y | Y × (1 - X/100) | 100 - 20% = 80 |
Understanding Percentages
📚 What is a Percentage?
A percentage means "per hundred." 25% = 25/100 = 0.25. It's a way to express a number as a fraction of 100, making comparisons easier.
🔄 Converting Percentages
To decimal: divide by 100 (25% = 0.25). To fraction: put over 100 and simplify (25% = 25/100 = 1/4). From decimal: multiply by 100.
💡 Common Percentages
10% = 1/10, 25% = 1/4, 33.33% = 1/3, 50% = 1/2, 75% = 3/4, 100% = 1 whole. Memorizing these helps quick mental math.
🛒 Real-World Uses
Discounts (20% off), tax (8.25% sales tax), tips (15-20%), interest rates, test scores (90/100 = 90%), statistics, nutrition labels.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage, then divide by 100. Formula:
(Percentage ÷ 100) × Number. Example: 25% of 200 = (25 ÷ 100) × 200 = 0.25 × 200 = 50.
How do I find what percentage one number is of another?
Divide the first number by the second, then multiply by 100. Formula: (Part
÷ Whole) × 100. Example: 50 is what % of 200? (50 ÷ 200) × 100 = 25%.
How do I calculate percentage increase?
Formula: ((New - Old) ÷ Old) × 100. Example: Price increased from
$80 to $100. ((100 - 80) ÷ 80) × 100 = 25% increase.
How do I calculate percentage decrease?
Formula: ((Old - New) ÷ Old) × 100. Example: Price dropped from
$100 to $75. ((100 - 75) ÷ 100) × 100 = 25% decrease.
How do I add a percentage to a number?
Formula: Number × (1 + Percentage/100). Or: Number + (Number ×
Percentage ÷ 100). Example: Add 20% to 100 = 100 × 1.20 = 120.
How do I subtract a percentage from a number?
Formula: Number × (1 - Percentage/100). Example: Subtract 20% from
100 = 100 × 0.80 = 80. This is useful for discounts.
What is 20% of 50?
20% of 50 = 10. Calculation: (20 ÷ 100) × 50 = 0.20 × 50 = 10.
Quick tip: 20% = 1/5, so divide 50 by 5 = 10.
What is 15% of 200?
15% of 200 = 30. Calculation: (15 ÷ 100) × 200 = 0.15 × 200 = 30.
Quick tip: 10% = 20, 5% = 10, so 15% = 30.
How do I calculate a tip percentage?
For a 20% tip: multiply bill by 0.20. For 15%: multiply by 0.15.
Quick method: 10% is easy (move decimal), then add half for 15% or double for 20%.
How do I calculate discount price?
Discount Price = Original × (1 - Discount%/100). Example: $80 item
with 25% off = 80 × 0.75 = $60. Or: 80 - (80 × 0.25) = $60.
How do I convert a decimal to percentage?
Multiply by 100. Examples: 0.25 = 25%, 0.5 = 50%, 0.125 = 12.5%,
1.5 = 150%. Just move decimal point 2 places right.
How do I convert percentage to decimal?
Divide by 100. Examples: 25% = 0.25, 7.5% = 0.075, 150% = 1.5.
Move decimal point 2 places left.
How do I calculate percentage difference?
Formula: |Value1 - Value2| ÷ ((Value1 + Value2) ÷ 2) × 100. This
gives the difference as a percentage of the average. Used for comparing two values.
What is the percentage change formula?
Percentage Change = ((New - Old) ÷ Old) × 100. Positive =
increase, negative = decrease. Example: 50 to 75 = ((75-50)÷50)×100 = 50% increase.
How do I find the original price before a discount?
Original = Sale Price ÷ (1 - Discount%/100). Example: Paid $60
after 25% off. Original = 60 ÷ 0.75 = $80.
What is 100% of a number?
100% = the whole number itself. 100% of 50 = 50. 200% = double
(100), 50% = half (25). Percentages over 100% mean more than the whole.
How do I calculate percentage in Excel?
For X% of Y:
=Y*(X/100) or =Y*X%. For what % X is of Y:
=X/Y then format as %. For % change: =(New-Old)/Old.