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% What is X% of Y?
Find the percentage of any number instantly
What is 25% of 200?
percent (%)
% of
number
=
answer
Result
50
25% of 200 = 50
% What percent is X of Y?
Find what percentage one number is of another
50 is what percent of 200?
number (X)
is % of
total (Y)
=
percent (%)
Result
25%
50 is 25% of 200
📈 Percentage Increase / Decrease
Calculate the percentage change between two values
From 100 to 150 — what is the % change?
original value
→
new value
=
% change
Percentage Change
+50%
📈 50% Increase
From 100 to 150 is a 50% increase
↔️ Percentage Difference
Find the percentage difference between two values
What is the % difference between 80 and 100?
value A
vs
value B
=
% difference
Percentage Difference
22.2%
The difference between 80 and 100 is 22.2%
➕ Add or Remove a Percentage
Add tax, discount or tip to any amount
200 + 20% = ? | 200 - 20% = ?
base amount
±
percent (%)
=
after adding
After Adding 20%
240
+$40 added
After Removing 20%
160
-$40 removed
⚡ Quick Percentage Reference
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How to Calculate Percentages
A percentage is a number expressed as a fraction of 100. The word "percent" comes from the Latin "per centum" meaning "by the hundred." Percentages are used everywhere in daily life — from calculating discounts and taxes to understanding statistics, financial returns and exam scores.
Key Percentage Formulas
1. Percentage of a number:
Result = (Percentage ÷ 100) × Number
Example: 25% of 200 = (25 ÷ 100) × 200 = 50
2. What percent is X of Y:
Percentage = (X ÷ Y) × 100
Example: 50 is what % of 200? = (50 ÷ 200) × 100 = 25%
3. Percentage increase/decrease:
Change% = ((New - Old) ÷ Old) × 100
Example: 100 to 150 = ((150-100) ÷ 100) × 100 = 50% increase
4. Percentage difference:
Diff% = (|A - B| ÷ ((A + B) ÷ 2)) × 100
Real World Percentage Examples
- Sales tax — if an item costs $80 and sales tax is 8%, tax = $6.40, total = $86.40
- Discount — if a $120 shirt is 30% off, discount = $36, sale price = $84
- Tip — a 20% tip on a $75 restaurant bill = $15 tip, total = $90
- Salary increase — a 5% raise on a $50,000 salary = $2,500 increase
- Investment return — if $1,000 grows to $1,150, the return is 15%
Common Percentage Mistakes to Avoid
- Percentage increase vs percentage points — a rate going from 5% to 8% is a 3 percentage point increase but a 60% percentage increase
- Adding percentages incorrectly — a 50% increase followed by a 50% decrease does not return to the original value
- Base number confusion — always confirm which number is the base when calculating percentage change
Frequently Asked Questions
How do I calculate 20% of a number? +
To calculate 20% of any number, multiply the number by 0.20 (or divide by 5). For example, 20% of 350 = 350 × 0.20 = 70. Use our "% of a Number" calculator above for instant results.
How do I calculate percentage increase? +
Percentage increase = ((New Value - Original Value) ÷ Original Value) × 100. For example, if a price went from $80 to $100, the increase = ((100-80) ÷ 80) × 100 = 25%. Use our Percentage Increase/Decrease calculator above.
What is the difference between percentage change and percentage difference? +
Percentage change measures how much a value changed relative to its starting point — it has a direction (increase or decrease). Percentage difference compares two values without implying a starting point — it is always positive and uses the average of both values as the base.
How do I calculate percentage discount? +
Discount amount = (Discount % ÷ 100) × Original Price. Sale price = Original Price - Discount Amount. For example, 30% off $150 = discount of $45, sale price = $105. Use our "Add/Remove %" calculator above.
How do I add a percentage to a number? +
New value = Original × (1 + Percentage/100). For example, adding 15% to 200 = 200 × 1.15 = 230. To remove a percentage, use: New value = Original × (1 - Percentage/100). So removing 15% from 200 = 200 × 0.85 = 170.