How to Calculate Percentage of a Number - Complete Guide

Calculating percentages is one of the most useful math skills for business, shopping, taxes, and everyday finance. Whether you want to calculate a discount, know your profit margin, or figure out VAT — this guide teaches you everything with practical examples.

What Does Percentage Mean?

A percentage (%) is a way to express a number as a fraction of 100. So "50%" simply means "50 out of 100" or "half". Percentages help us compare quantities, track growth, and understand proportions.

Basic Formula for Calculating Percentage

The core formula is beautifully simple:

Percentage of number = (Number × Percentage) ÷ 100

Example 1: Basic Percentage

What is 20% of 500?

• 500 × 20 = 10,000
• 10,000 ÷ 100 = 100
• Answer: 20% of 500 = 100

Example 2: Discount Calculation

A product costs SAR 800 with a 25% discount. What is the discount amount?

• 800 × 25 ÷ 100 = 200
• Discount = SAR 200 | Final Price = SAR 600

How to Calculate Percentage Between Two Numbers

To find what percentage one number is of another:

Percentage = (Part ÷ Whole) × 100

Example: You scored 45 out of 60 on a test. What percentage did you get?

• (45 ÷ 60) × 100 = 75%

Calculating Percentage Increase or Decrease

Change Formula: ((New Value − Old Value) ÷ Old Value) × 100

Example: Salary went from SAR 5,000 to SAR 6,500. What is the percentage increase?

• (6,500 − 5,000) ÷ 5,000 × 100 = 30% increase

Practical Business Applications

1. Profit Margin

Profit % = ((Selling Price − Cost) ÷ Cost) × 100

2. VAT Calculation (Saudi Arabia 15%)

VAT amount = Price × 15 ÷ 100. For example, on a SAR 1,000 product: VAT = SAR 150.

Try our free VAT Calculator for instant results.

3. Employee Commission

If salesperson earns 5% commission on sales of SAR 50,000: Commission = 50,000 × 5 ÷ 100 = SAR 2,500.

Quick Percentage Tricks

• 10% of anything: Move the decimal one place left (10% of 350 = 35)
• 1% of anything: Move the decimal two places left (1% of 350 = 3.5)
• 50%: Divide by 2
• 25%: Divide by 4

Use Our Free Percentage Calculator

Instead of manual calculations, use our free Percentage Calculator that instantly calculates:

• Percentage of a number
• Discounts and price after discount
• Increase and decrease
• Difference between two numbers
• Profit and loss margins

Managing Business Percentages Automatically

If you run a business, calculating percentages manually for every invoice becomes tedious. Daqiq — cloud accounting and POS software — automatically handles all business percentages:

• Automatic VAT calculation on every invoice
• Automatic profit margin calculation
• Discount management with instant calculation
• Detailed financial reports with all percentages

Frequently Asked Questions

How do I calculate 15% of an amount?

Multiply the amount by 15, then divide by 100. Example: 15% of 200 = 200 × 15 ÷ 100 = 30.

What is the difference between percentage increase and percentage of?

"Percentage of" is a part of the number (20% of 100 = 20). "Percentage increase" is a growth rate from an old value to a new one.

How do I calculate discount percentage from prices?

Formula: ((Original Price − Sale Price) ÷ Original Price) × 100. Example: from 500 to 400 = 20% discount.

How do I calculate profit percentage?

((Selling Price − Cost) ÷ Cost) × 100. Bought at 80, sold at 100 → profit = 25%.

Conclusion

Percentage calculation is a fundamental skill you use daily — from shopping and taxes to salary and profits. Save your time and use our free Percentage Calculator for instant accurate results. If you own a business, discover Daqiq which automates all your financial calculations professionally.