Guides

Profit is the money left over once you have paid for what you sell. This guide explains the profit formula in plain English, walks through real examples, and shows how to use the profit calculator to check your numbers in seconds.

Margin and markup both describe profit as a percentage, but they use different bases — and mixing them up is one of the most common pricing mistakes a small business can make. This guide sets out the difference, the formulas, and a conversion table you can rely on.

Gross profit is the first real measure of whether what you sell is making money. This guide explains what gross profit is, how it differs from net profit, what counts as cost of goods sold, and how to turn the figures into a gross margin you can compare over time.

A percentage increase tells you how much something has grown relative to where it started. This guide walks through the percentage increase formula, works through everyday examples, and shows how to add a percentage to a number in one step.

A percentage decrease tells you how much something has fallen relative to where it started. This guide explains the percentage decrease formula, works through real examples, and shows how it relates to discounts and depreciation.

Percentage change is a single figure that covers both increases and decreases, which makes it ideal when you do not yet know which way a value has moved. This guide explains the formula, how to read a negative result, and how percentage change differs from percentage difference.

Cost price and selling price are the two numbers at the heart of every sale. This guide explains what each one means, how profit and markup sit between them, and how to work out one from the other when you are setting or checking prices.

Setting the right price is one of the most important decisions a business makes. This guide walks through a practical approach to pricing products for profit — covering cost, margin, markup, break-even and VAT — so you can set prices with confidence rather than guesswork.