CalcMulti

Percentage Calculator

Calculate percentages, percentage changes, discounts, grades, and more. Perfect for math, business, shopping, and academic needs.

What is X% of Y?

%

X is what % of Y?

Quick Examples

25% of 20050
15% tip on $80$12
30 out of 5060%
20% discount on $150$120
$100 to $120 change+20%
18/20 test score90% (A-)

Basic Percentage Results

25% of 100
0.00
25 is what % of 100
0.00%

How It Works

Basic Percentage

Formula: (Percentage ÷ 100) × Value

Example: 25% of 200 = (25 ÷ 100) × 200 = 50

Percentage of Total

Formula: (Part ÷ Total) × 100

Example: 25 of 100 = (25 ÷ 100) × 100 = 25%

Percentage Calculator Guide

Common Percentage Uses

  • Shopping: Calculate discounts, sales tax, tips
  • Finance: Interest rates, investment returns, loan terms
  • Business: Profit margins, growth rates, market share
  • Education: Test scores, grade calculations, statistics
  • Health: Body composition, nutrition labels, success rates
  • Data Analysis: Survey results, demographic breakdowns

Quick Mental Math Tips

  • 10%: Move decimal point one place left
  • 50%: Divide by 2
  • 25%: Divide by 4
  • 20%: Divide by 5
  • 1%: Move decimal point two places left

Percentage Formulas

Basic Percentage:
Percentage × Value ÷ 100 = Result
Percentage of Total:
(Part ÷ Total) × 100 = Percentage
Percentage Change:
((New - Original) ÷ Original) × 100 = Change%
Percentage Increase:
Value × (1 + Percentage/100) = New Value

Real-World Examples

  • Tip: 18% of $50 bill = $9 tip
  • Discount: 30% off $80 = $56 final price
  • Tax: 8% sales tax on $100 = $108 total
  • Grade: 85/100 questions = 85% score
  • Growth: $1000 to $1200 = +20% increase

How to Use This Calculator

Basic Tab:

  • Calculate X% of Y (e.g., 25% of 200)
  • Find what percentage X is of Y
  • Perfect for tips, taxes, discounts

Change Tab:

  • Calculate percentage change between values
  • Increase or decrease by percentage
  • Great for growth rates, price changes

Discount Tab:

  • Calculate final price after discount
  • See how much money you save
  • Perfect for shopping and sales

Grade Tab:

  • Convert test scores to percentages
  • See letter grade equivalents
  • View standard grading scale

Percentages are everywhere - master them with practice!