How to use the calculator
Drag the sliders to match one of your products. Start with your selling price and product cost, then add shipping, the platform fee percentage, any affiliate or influencer commission, your typical return rate, and what you spend on ads per order. The result updates instantly as you move each slider, and the cost breakdown shows exactly where every dollar of the sale price goes. Nothing you enter is saved or sent anywhere, so you can test freely.
A worked example you can follow
Let's walk through the calculator's default numbers so you can see how the pieces fit together. Picture a $35 product that costs you $8 to source, with $4.50 shipping, a 6% platform fee, a 10% affiliate commission, a 5% return rate, and $3 of ad spend per order.
Where the $35 actually goes
That works out to a 37.9% net margin, a healthy result. Notice that of the $35 sale, more than half is consumed by costs before you keep anything. The tool makes that visible instead of leaving it to guesswork.
Why the fees add up faster than you think
The trap with marketplace selling is that no single fee looks alarming on its own. Six percent here, ten percent there, a few dollars of shipping, each one feels small. Stacked together on the same order, though, they routinely eat 60% or more of the sale price. The danger is that sellers tend to check one or two costs, feel reassured, and scale up a product that only looked profitable because the other costs were never counted.
Commission is the one that moves the most. During a promotion or a push with a bigger creator, a 10% affiliate rate can climb to 20%, and because it is charged on the full selling price, that jump comes straight out of your margin. Watch what happens to the same $35 product when the promo rate applies, returns tick up, and you spend more to acquire each sale.
Same product, tougher conditions
Nothing here is extreme, yet the margin fell from 37.9% to 16.9%, less than half of before. This is exactly the kind of quiet erosion the calculator is built to catch before you commit ad budget to it.
What counts as a healthy margin?
There is no single right answer, because margins vary a lot by product category, but a few widely used rules of thumb give you a starting point.
A common target is to keep your product cost (COGS) at roughly 20% to 30% of your selling price. Put another way, many sellers aim to price a product at three to five times what it costs them. Pricing that way leaves the other 70% to 80% of the sale to cover the platform fee, affiliate commission, shipping, and advertising, with profit still left over.
For net margin, which is what you keep after everything, a rough guide is this: under about 10% is thin and leaves little room for error, 15% to 25% is generally considered solid for marketplace selling, and above 25% gives you comfortable room to spend on growth. Treat these as general benchmarks, not targets that fit every business.
The reason the COGS ratio matters so much is that your growth costs, affiliate commission and ad spend especially, come out of what is left after COGS and shipping. If your product costs half the selling price, there is very little room left to pay a creator 10% and still run profitable ads. If it costs a quarter, you have real room to work with.
An allocation with room for growth
This is one illustrative split, not a rule. The point is the shape: keep COGS to roughly a quarter of the price and you leave healthy room for creators, ads, and profit at the same time. Push COGS much higher and those growth levers start to disappear.
Use the calculator above to test your own product against these ranges. If the net margin comes out thin, the usual levers are lowering COGS through better sourcing, raising the price, or trimming commission and ad spend until the numbers work. This is general educational guidance rather than financial advice, and the right figures depend on your category, so always verify your own costs and current platform fees.
Break-even ROAS, in plain terms
ROAS, which stands for return on ad spend, is simply the revenue you earn for every dollar you put into ads. Your break-even ROAS is the point where the sales an ad generates exactly cover its cost and everything else. Above that point you profit. Below it you lose money on every order the ad brings in.
This number matters because it turns a vague worry about whether your ads are worth it into a hard target you can check against your TikTok dashboard. If the calculator tells you that you need at least a 2.5x return to break even and your campaign is running at 1.8x, you know right away that scaling it will only lose money faster, no spreadsheet required. It is the difference between deciding with a number and deciding on a hunch.
And when the numbers do not work, the tool shows it plainly. Push the ad spend high enough on a thin margin product and the result turns negative, a loss on every single order.
A $25 product with heavy ad spend
Every sale loses $4.13. On a busy day that is hundreds of dollars gone, the kind of result that stays invisible until the tool lays it out. Better to find it on this page than in next month's payout.
Using this to make better decisions
The goal of this calculator is not to hand you a single number and send you off. It exists to help you make informed decisions before you spend real money. A few ways sellers put it to work: test a product's margin before sourcing inventory, so you never commit to something that cannot be profitable; find the highest affiliate commission you can afford before negotiating with a creator; and pressure test a price by nudging returns and ad spend upward to see how much cushion you really have.
Used that way, the tool becomes a quick gut check you run on every product idea, a few seconds of dragging sliders that can save weeks of selling at a loss. That is the whole point of the site: to be a practical resource that helps small businesses price with confidence instead of hope.