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Calculators•Math

Percentage Calculator

The Percentage Calculator provides three distinct calculation modes: finding what percentage one number is of another, finding the percentage value of a number, and calculating the percentage increase or decrease between two values. Ideal for sales discounts, grading, finance, and everyday math.

Calculations occur 100% locally in your browser memory. No figures are transmitted.
Math(5 tools)
Percentage CalculatorPercentage Increase CalculatorPercentage Decrease CalculatorRatio CalculatorFraction Calculator
Calculated Result
1000

(10 ÷ 100) × 10000 = 1000

About Percentage Calculator

The Percentage Calculator provides three distinct calculation modes: finding what percentage one number is of another, finding the percentage value of a number, and calculating the percentage increase or decrease between two values. Ideal for sales discounts, grading, finance, and everyday math.

Primary Purpose: Calculate percentages, proportions, and percentage changes quickly and accurately

How to Use the Percentage Calculator

  1. 1Choose the calculation mode (Percent of Number, What Percent Is X of Y, or Percentage Change).
  2. 2Input the values into the respective numerical input fields.
  3. 3The exact percentage and step-by-step mathematical breakdown appear instantaneously.

Formula & Methodology

Percentage = (Part / Whole) × 100

To find what percentage a part is of a whole, divide the part by the whole and multiply by 100.

Real-World Worked Examples

Calculating a 15% tip or discount on a $200 bill

Find 15% of $200

Inputs
percent:15
total:200
Result:30
Measuring sales growth over consecutive quarters

Percentage increase from 50 to 75

Inputs
initial:50
final:75
Result:+50%
Comprehensive Editorial Guide

How to Calculate Percentages in Your Head and on Paper

Master mental math percentage formulas for tips, shopping discounts, sales tax, and performance metrics.

Read Guide

Frequently Asked Questions

How do I calculate what percentage one number is of another?

Divide the number you want to evaluate (Part) by the total number (Whole), then multiply the resulting decimal by 100.

What is the formula for percentage increase or decrease?

Subtract the original value from the new value, divide by the absolute original value, and multiply by 100: ((New - Old) / Old) * 100.

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