Margin vs markup: the difference that costs sellers money
Margin is profit as a share of the selling price. Markup is profit as a share of the cost. If an item costs 60 and sells for 100 before VAT, the profit is 40, the margin is 40% and the markup is 66.7%. Many sellers add a 30% markup and think they earn a 30% margin, but a 30% markup is only a 23% margin. Fees and discounts are taken from the price, so margin is the number to watch when you set prices and compare products.
Why VAT is not your profit
If you are VAT-registered, the VAT your customer pays belongs to the tax authority, not to you. In the UAE a price of AED 105 including 5% VAT is AED 100 of revenue and AED 5 of VAT you pay over. In Saudi Arabia, at 15%, the gap is wider. This calculator takes the VAT out first and works out the margin on your real revenue. On the cost side, a registered seller can usually recover the VAT on purchases, so costs are entered without VAT. If you are not registered, choose "No VAT" and enter your costs as you pay them.
Count every cost of a sale
Online sellers often look at product cost alone and miss the costs that come with each order: delivery and cash-on-delivery charges, packaging, marketplace commission, payment gateway fees, returns and the advertising it took to win the order. Add these per sale in "Other costs" for a true picture. A product that looks like a 50% margin on paper can be close to break-even after fees and ads, and it is better to know that before you scale it.