Ecommerce Profit Margin Calculator: Are You Actually Making Money?

Most Sellers Don't Know Their Real Margins

I've spoken to hundreds of ecommerce sellers who can tell me their revenue but not their actual profit. Many are surprised — and not in a good way — when they add up every cost. If you don't know your true margin per product, per platform, you can't make informed decisions about pricing, advertising, or expansion.

The Full Cost Stack

For every unit sold, your costs include:

• Product cost — manufacturing, wholesale, or handmade materials + labour
• Shipping to you/warehouse — inbound freight, courier costs to store inventory
• Platform fees — referral fees, listing fees, subscription fees
• Payment processing — built into platform fees on most marketplaces, separate on Shopify
• Fulfilment — FBA fees, or your own pick/pack/ship costs (labour, packaging materials, postage)
• Returns — return shipping costs + restocking costs + products that can't be resold. Budget 3-8% of revenue for returns
• Advertising — PPC spend, promoted listings, social ads
• VAT — if you're VAT registered, 20% of your margin is effectively spoken for (or your pricing needs to account for it)
• Photography and content — amortised across expected unit sales
• Tools and software — inventory management, accounting, email marketing
• Your time — the most forgotten cost. If you spend 4 hours listing a product and it sells 10 units, that's 24 minutes of your time per sale

How to Calculate True Margin

The formula:

True Profit per Unit = Sale Price - Product Cost - Platform Fees - Fulfilment Cost - Advertising Cost per Unit - Returns Allowance - VAT (if applicable)

True Margin % = (True Profit per Unit / Sale Price) × 100

Run this calculation for every product on every platform. You'll likely find some products are barely breaking even (or losing money) while others are highly profitable.

Target Margins by Business Type

• Private label products: Aim for 25-40% net margin after all costs
• Wholesale/reselling: 10-20% net margin is realistic
• Handmade: 40-60% if you're not counting your time as a cost (you should)
• Dropshipping: 5-15% (thin margins, high volume required)

What to Do When Margins Are Too Thin

• Raise prices — test a 5-10% increase. You'll lose some sales but often make more profit overall
• Reduce ad spend on unprofitable products — analyse ACOS/ROAS per product, not overall
• Negotiate supplier costs — even 5% cost reduction flows straight to profit
• Bundle products — bundles often have higher margins than individual items
• Cut unprofitable products — focus your time and capital on your winners

I run this analysis for every client I work with. It's often the first exercise we do, and it frequently reveals that 20% of products generate 80% of the profit.