📊 Percentage Calculator

Percentage Calculator: The Ultimate 4-in-1 Percentage Tool

Welcome to the Percentage Calculator — the most comprehensive percentage tool on the internet. Whether you're calculating tips at a restaurant, figuring out sale discounts, analyzing business growth, or solving homework problems, this calculator handles it all. With four different calculation modes, you'll never need another percentage tool again.

How to Use This Percentage Calculator

1. Percentage of a Number

Use this mode to find what X% of Y equals. For example, "What is 20% of 80?" Enter 20 as the percentage and 80 as the number. The calculator instantly returns 16.

Formula: Result = (Percentage × Number) ÷ 100

2. What Percentage is X of Y?

Use this mode to find what percentage one number represents of another. For example, "What percentage is 16 of 80?" Enter 16 as the part and 80 as the total. The calculator returns 20%.

Formula: Percentage = (Part ÷ Total) × 100

3. Percentage Increase/Decrease

Use this mode to calculate percentage change between two values. For example, "From 50 to 75 is what percentage increase?" Enter 50 as original and 75 as new. The calculator returns 50% increase.

Formula: Percentage Change = ((New - Original) ÷ Original) × 100

Real-World Applications

• 💰 Discounts & Sales: "30% off a $150 jacket" → Save $45, pay $105
• 🍽️ Tips & Gratuity: "15% tip on a $40 meal" → $6 tip, total $46
• 📈 Business Growth: "Revenue grew from $50K to $75K" → 50% growth
• 📊 Test Scores: "45 out of 60 on an exam" → 75% score
• 🏦 Interest Rates: "5% interest on $10,000" → $500 in interest
• 📉 Stock Performance: "Stock fell from $100 to $80" → 20% loss
• 🏋️ Fitness: "Lost 10 lbs from 200 lbs" → 5% weight loss
• 📊 Survey Results: "250 out of 1000 respondents" → 25%

Common Percentage Questions & Answers

What is 10% of 50?

10% of 50 = 5. (10 × 50) ÷ 100 = 5

What is 15% of 200?

15% of 200 = 30. (15 × 200) ÷ 100 = 30

What is 25% of 80?

25% of 80 = 20. (25 × 80) ÷ 100 = 20

What percentage is 30 out of 150?

30 is 20% of 150. (30 ÷ 150) × 100 = 20%

What is the percentage increase from 40 to 60?

40 to 60 = 50% increase. ((60-40) ÷ 40) × 100 = 50%

What is the percentage decrease from 80 to 60?

80 to 60 = 25% decrease. ((80-60) ÷ 80) × 100 = 25%

Common Percentage Conversions Table

Fraction	Decimal	Percentage
1/100	0.01	1%
1/20	0.05	5%
1/10	0.10	10%
1/5	0.20	20%
1/4	0.25	25%
1/3	0.333...	33.33%
1/2	0.50	50%
2/3	0.666...	66.67%
3/4	0.75	75%
1/1	1.00	100%

Frequently Asked Questions