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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
Percentage Calculator — Complete Guide
Percentages are used everywhere in daily life — from calculating discounts and tips to understanding tax rates, interest charges and salary increases. Our percentage calculator handles all common percentage calculations in one place instantly. See our unit converter for a related calculation. See our ratio calculator for a related calculation. See our square root calculator for a related calculation.
Common Percentage Formulas
What is X% of Y?
Answer = Y × (X/100)
Example: What is 15% of $200? = $200 × 0.15 = $30
X is what % of Y?
Answer = (X/Y) × 100
Example: 30 is what % of 200? = (30/200) × 100 = 15%
Percentage increase from X to Y:
Answer = ((Y-X)/X) × 100
Example: From $100 to $125 = ((125-100)/100) × 100 = 25% increase
Percentage decrease from X to Y:
Answer = ((X-Y)/X) × 100
Example: From $200 to $150 = ((200-150)/200) × 100 = 25% decrease
Quick Percentage Reference
| Percentage | Of $1,000 | Quick Tip |
|---|---|---|
| 1% | $10 | Move decimal 2 places left |
| 10% | $100 | Move decimal 1 place left |
| 25% | $250 | Divide by 4 |
| 50% | $500 | Divide by 2 |
📊 Tip: Bookmark this page for quick daily percentage calculations — from splitting bills to calculating discounts and salary increases!
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.