The product pricing calculator above solves a problem that trips up almost every first-time seller: fees are a percentage of the price you're trying to find, not a percentage of your cost. Add 35% to your cost and you'll feel great about your margin right up until the marketplace and the payment processor take their cut — and suddenly the "profitable" product is barely breaking even.
This tool exists because we build and price e-commerce storefronts every week at Arb Digital, and the single most common mistake we see in a new store's spreadsheet is pricing forward from cost instead of backward from fees. Get the order of operations right here and every other pricing decision downstream gets easier.
What This Product Pricing Calculator Does
It takes every real cost that touches a unit before it lands in a customer's hands — materials, labour, packaging and shipping, and your overhead allocation — and adds it to the two fee lines almost everyone forgets to model properly: payment processing (a percentage plus a flat fee, charged on every transaction) and marketplace or platform fees (a percentage of the sale price, charged by Amazon, Etsy, Shopify's payment partner, or wherever you sell). Then it works the algebra backward to find the one price at which your profit, after every fee is deducted, equals your target margin percentage of that price.
That's a meaningfully different calculation from "cost plus markup." A markup calculation tells you what to charge above cost. This calculator tells you what to charge above cost and above the fees that price itself will generate — which is the number that actually shows up in your bank account.
How to Use It
- Enter your materials cost. What you pay a supplier or manufacturer per unit, landed — include freight-in if you import.
- Add labour per unit. Assembly, fulfilment, quality checks — anyone's time that touches the product.
- Add packaging and shipping per unit. Boxes, mailers, inserts, and the outbound shipping cost you absorb.
- Add your overhead allocation. Take your monthly fixed costs (rent, software subscriptions, your own salary draw) and divide by expected monthly unit volume.
- Enter your payment processing rate. Stripe and most card processors default to roughly 2.9% + $0.30 per transaction in the US.
- Enter your marketplace fee. Etsy is around 6.5%, Amazon referral fees typically run 8–15% depending on category — check your specific channel.
- Set your target margin and click Calculate to see the price that actually delivers it.
The Formula Behind Cost-Plus-Fees Pricing
Start with your true landed cost per unit — materials plus labour plus packaging and shipping plus overhead allocation. Then recognise that both fee types are functions of the final price, not the cost. If P is the price you're solving for, marketplace fees equal a percentage of P, and payment fees equal a percentage of P plus a fixed amount. Your profit is P minus landed cost minus both fee amounts, and you want that profit to equal your target margin percentage times P. Rearranging the equation algebraically gives: Price = (Landed cost + fixed payment fee) ÷ (1 − target margin % − marketplace fee % − payment fee %). The Small Business Administration's guidance on pricing strategy notes that businesses which price only from cost, ignoring channel and transaction costs, consistently under-price and erode margin without realising it — see SBA.gov's guide to pricing products and services.
Why a 35% "Margin" Product Can Still Lose Money
Here's the trap in plain numbers. Say your landed cost is $27 and you mark it up to hit what looks like a 35% margin over cost — roughly $36.45. That feels like a healthy product. But sell it on a marketplace that takes 15% and process the payment through a gateway charging 2.9% + $0.30, and the fees alone eat $6.16 off that $36.45 sale. Your real margin has collapsed to about 18%, not 35%. Scale that error across a few thousand units a month and you've quietly given away tens of thousands of dollars in margin you thought you had. This is precisely why the tool solves the price including the fee percentages inside the equation, rather than layering fees on afterward — the fees have to be baked into the price itself before you ever list the product.
Overhead: The Line Everyone Forgets
Materials, labour, and shipping are visible costs — they show up on an invoice, so sellers remember them. Overhead is invisible in the same way, which is exactly why it gets left out of pricing spreadsheets so often. Your Shopify subscription, your accounting software, the portion of your own time spent on customer service and restocking, your storage space — all of it belongs on every unit you sell, allocated as a per-unit overhead figure. A product that looks profitable when you only count materials and labour can be quietly loss-making once a fair share of overhead is loaded in. Investopedia's overview of cost-plus pricing methodology makes the same point: sustainable pricing has to reflect total cost of doing business, not just the cost of the physical goods — see Investopedia's explainer on cost-plus pricing.
Stacking Multiple Fee Layers Without Losing Track
Most sellers eventually sell through more than one channel — their own Shopify store, a marketplace, maybe a wholesale account — and each one has a different fee stack. The discipline this calculator builds is treating fees as a first-class input every time you set a price, not a one-off adjustment you make when margins look thin. If you sell the same SKU on your own site (where you might only pay 2.9% + $0.30 in payment fees) and on Amazon (where you're paying that plus a 15% referral fee), you genuinely need two different prices, or the marketplace channel silently subsidises everyone else's cheaper checkout. Run this calculator once per channel and keep the outputs on file — it takes thirty seconds and it's the difference between a pricing strategy and a guess.
A Worked Example: Watching the Fees Eat the Margin
Take a seller with a $27 landed cost per unit — $12 in materials, $8 in labour, $4 in packaging and shipping, and $3 of overhead allocation. They want a 35% margin, sell on a marketplace charging 15%, and process payments at 2.9% + $0.30. Plug those numbers into the calculator and the recommended price comes out to roughly $57.96, not the $41.54 a simple "add 35% to cost" calculation would produce. At $57.96, the marketplace fee alone is about $8.69, the payment fee is roughly $1.98, and total fees come to around $10.67 — nearly 40% of the naive cost-plus price the seller might otherwise have charged. Profit per unit lands at about $20.29, which is exactly 35% of $57.96. Compare that to what happens if the seller had priced at the naive $41.54 instead: fees would still apply, cutting real profit down to roughly $8.15 per unit — a 19.6% margin, not the 35% they thought they'd built in. That gap, multiplied across a full year of sales, is the difference between a business that's genuinely profitable and one that only looks profitable on a spreadsheet that never accounted for fees.
Recalculating When Fees or Costs Change
Marketplace referral fees change more often than sellers expect — Amazon and Etsy both revise category fee schedules periodically, and payment processors occasionally adjust their published rates too. Every time one of those numbers moves, the price that hits your target margin moves with it, even if your own costs haven't changed at all. The same is true in reverse: a supplier price increase on materials, a new packaging requirement, or added labour from a more complex fulfilment process all shift the landed cost side of the equation. Treat this calculator as something you run quarterly at minimum, or immediately after any fee schedule notice from a marketplace, rather than a one-time exercise you did when you first listed the product. Sellers who set a price once and never revisit it are the ones who discover, a year later, that their "profitable" bestseller has been quietly running at a loss since a fee increase they never noticed.
Arb Digital builds and optimizes e-commerce stores and runs the marketing that fills them — from pricing strategy to paid traffic. Let's talk about your store.
Our Services All Free ToolsCommon Mistakes to Avoid
- Marking up cost instead of solving for price. A flat markup ignores that fees scale with the final price, not the cost.
- Forgetting overhead entirely. "Profitable" products that only cover materials and labour are often losing money once rent and software are counted.
- Using one price across every channel. Different marketplaces charge different fees — one price can't be optimal everywhere.
- Ignoring the fixed payment fee on low-priced items. A flat $0.30 fee is negligible on a $200 sale and brutal on a $5 sale.
- Setting a target margin without checking it's achievable. If fees plus target margin exceed 100%, no price solves the equation — you need to cut costs or fees, not just raise price.
- Never revisiting price after a fee change. Marketplaces raise referral fees periodically; a price set two years ago may no longer clear your target margin.
Related Free Tools From Arb Digital
Pair this calculator with the wholesale price calculator if you also sell to retailers, the markup calculator for a simpler cost-plus view, the gross margin calculator to check your overall margin health, and the break-even units calculator to see how many units you need to sell to cover fixed costs. You'll find the full set at our free online tools hub.
Working on this from another angle? Our discount calculator covers it.
Frequently Asked Questions
Because marketplace and payment fees are charged on the final sale price, not on your cost. If you only mark up from cost, the fees eat into your margin after the fact and you fall short of your target. This calculator solves for the price that still hits your target margin after fees are deducted.
Any fixed cost of running the business divided across the units you expect to sell — software subscriptions, rent or storage, insurance, and a fair share of your own time. It's easy to skip because it doesn't arrive as a per-unit invoice like materials do.
Usually not. Amazon and similar marketplaces charge referral fees your own storefront doesn't, so a single price either overcharges direct customers or undercharges marketplace sales. Run the calculator separately for each channel's fee structure.
That usually means your target margin plus your combined fee percentages are too close to 100%. Lower your target margin, negotiate your marketplace fee tier, or reduce landed cost — the maths is telling you the current combination isn't achievable at a competitive price.
No — rates vary by processor, card type, and country. 2.9% + $0.30 is a common US baseline for online card payments, but check your actual processor statement and use that figure for accuracy.
No. This tells you the minimum price needed to hit your margin target given your real costs and fees. You still need to check that price against what the market will actually pay — if it's above what competitors charge, you need to lower cost or accept a thinner margin, not ignore the maths.
