How do I calculate a percentage of a number?

To find X% of Y, multiply Y by X and divide by 100. For example, 20% of 50 = (50 × 20) ÷ 100 = 10.

What's the difference between discount and markup?

A discount reduces the price from the original. A markup increases the cost. Markup is the profit added to cost price.

How do I calculate percentage change?

Percentage change = ((New Value - Old Value) / Old Value) × 100. This shows if something increased or decreased.

Can I use this for sales tax calculations?

Yes, use the percentage calculation to find the tax amount, or add it to the original price to find the total.

What is the formula for finding percentage?

Percentage = (Part / Whole) × 100. This shows what fraction of the total is represented as a percentage.

Can I calculate tips using this?

Yes, it's perfect for calculating tips. Common tip percentages are 15%, 18%, and 20% of the bill amount.

Percentage Calculator

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Multiple Calculations

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Real-world Uses

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Calculate: What is X% of Y?

Number (Y):

Percentage (X %):

Save money: Calculate discount and final price

Original Price ($):

Discount (%):

Add profit: Calculate markup and selling price

Cost Price ($):

Markup (%):

Percentage Formulas

Basic Percentage

X% of Y = (Y × X) ÷ 100

Example: 20% of $50 = $10

Discount

Final = Price - (Price × Discount%)

Example: $100 - 20% = $80

Markup

Final = Cost + (Cost × Markup%)

Example: $50 + 20% = $60

Real-World Uses

Shopping

Calculate sale prices and discounts while shopping

Tips & Tax

Calculate tips on restaurant bills and sales tax

Business

Calculate profit margins and retail markups

Finance

Track percentage changes in investments

Tips for Accuracy

Double-check: Verify calculations manually if critical
Rounding: Results shown to 2 decimal places for currency
Units: Ensure values are in same currency/unit
Tip Percentages: Common: 15%, 18%, 20% of bill

Tax Calculation: Add tax to original price, not discounted
Percentage Change: Market changes often use percentage increases
Wholesale to Retail: Markup is cost-based profit
Order of Operations: Apply discount before tax