How to calculate your dropshipping profit margin

Where a $100 sale goes: product cost, ads, fees, and net profit, with a 25% net margin

Most sellers watch their revenue. The number that actually decides if your store survives is your margin, the slice of each sale you get to keep. Let us walk through the math in plain terms, with a simple example.

Gross margin vs net margin

There are two numbers, and people mix them up all the time.

Gross margin looks at one thing: your selling price minus what the product cost you. The formula is (selling price - product cost) / selling price. Dropshipping stores often sit around 60% to 70% gross margin, meaning you keep roughly $60 to $70 of every $100 before other costs (TrueProfit's benchmarks).
Net margin is what is left after everything: product cost, ads, payment fees, shipping, refunds. This is your real profit. For most stores it lands between 10% and 20% (TrueProfit).

Gross margin looks great. Net margin is the one that pays your bills.

The simple formula

Net profit margin is just:

(Revenue - all your costs) / Revenue x 100

Let us run a real $100 sale:

Where the money goes	Amount
Selling price	$100
Product cost (your supplier)	$40
Ads to get the sale	$22
Payment fees and shipping	$13
Net profit	$25

So 25 / 100 x 100 = 25% net margin. That is a healthy store. Shopify has a good primer if you want the full formula.

Why the supplier price is the scariest number

Here is the part most people miss. Your costs are not fixed. Say your supplier quietly raises the product from $40 to $45. Nothing else changes. Your net profit drops from $25 to $20, a 20% cut in your profit from a single $5 change you never agreed to.

That is the silent margin killer in dropshipping. Supplier prices move all the time, and if you do not notice, you keep selling at the old price and pocket less every single day. The fix is to track supplier prices automatically instead of checking by hand.

A margin to aim for

A net margin of 15% to 25% is a healthy target for a store you can grow (TrueProfit). Below 10%, you are one supplier price bump or one ad-cost spike away from selling at a loss without realising it.

Keep your margin from leaking

Doing the math once is easy. Keeping it true is the hard part, because the numbers change under you. The single best habit is to watch your supplier costs and reprice when they move.

That is exactly why we built MarginGuard. You paste the links to your supplier products, we check the price 24/7, and we email you the moment one changes, so your margin math never goes stale. It is free for your first 3 products, no card required. Start protecting your margin.