E-commerce break-even calculator
An online store's break-even math runs on orders, and the variable cost per order is easy to under-count — payment processing, fulfillment, and returns all eat into margin before a generic break-even formula ever asks about them.
Break-even orders
183
Break-even revenue
$9,488
Who reaches for this
Needs the minimum monthly order volume before the product earns its place in the catalog and the ad budget behind it.
Wants to see the trade-off between per-unit margin and fixed cost before committing to holding stock.
Is checking how many fewer orders are needed to break even after a price increase, or how many more after a discount.
Needs to know the steady-state subscriber floor separately from the acquisition-cost payback question.
Needs to see how break-even shifts once marketplace fees or a lower wholesale price replace direct-to-consumer margin.
What all five have in common is a variable cost per order that's more complicated than a textbook manufacturing example — payment processing, fulfillment, and often returns and ad spend all belong in the number before it means anything. The sections below build that number up piece by piece rather than asking for it as a single guess.
The formula, applied to orders
Inventory vs. dropshipping: two different cost structures
Two stores selling the same product at the same $52 price can have wildly different break-even points, because "e-commerce" actually covers two distinct cost structures. An inventory-model store buys stock in bulk, gets a better per-unit product cost, and pays for that with warehousing, 3PL fees, and cash tied up in stock that might not sell. A dropshipping store pays a higher price per unit with no volume discount, but carries close to zero fixed fulfillment cost and no inventory risk at all.
Running the same $52 product through both models makes the difference concrete. The inventory-model store pays $14 in COGS, $6.50 in shipping, $1.80 in payment processing, and $1.20 in packaging — a $23.50 variable cost per order and a $28.50 contribution margin. The dropshipping version of the same product costs $24 landed from the supplier (already including their shipping) plus the same $1.80 in payment processing — a $25.80 variable cost and a thinner $26.20 contribution margin.
The gap shows up almost entirely in fixed costs, not contribution margin. The inventory store is carrying a 3PL storage minimum, packaging supplies bought in bulk, and often a part-time hire — commonly $3,000-$8,000 a month once it's all added up. The dropshipping store's fixed costs are close to just the software stack, often under $800 a month, because there's no warehouse and no staff needed to pick and pack.
Neither model is objectively better — they trade risk for margin in opposite directions. The inventory store can improve its contribution margin further with volume discounts as it scales, something a dropshipper structurally can't do without abandoning the model, but it's also exposed to dead stock if a product doesn't sell. The dropshipping store gives up that margin ceiling in exchange for being able to test new products with close to zero downside if demand doesn't materialize — a trade worth making explicit before committing capital either way.
The dropshipping store needs less than a ninth of the order volume to break even, despite a slightly worse margin per order — because it isn't carrying the fixed cost of holding inventory. That trade-off is the real decision most first-time sellers are making when they choose between the two models, whether they frame it that way or not.
Building your real fixed costs for a DTC store
Fixed costs for an online store are easy to under-count because no single line item looks large — it's the accumulation that matters. Work through each of these before locking in a number:
Shopify, BigCommerce, or a similar platform plan — commonly $29-$399/month depending on tier, before add-on apps.
A monthly storage minimum or account fee, separate from the per-order pick-and-pack cost, which belongs in variable cost instead — commonly $150-$500/month for a small operation.
Email/SMS marketing, reviews, helpdesk, analytics — individually small, commonly $150-$400/month combined once four or five tools are running.
General liability and, for some categories, product liability coverage — typically $50-$200/month for an early-stage brand.
Any pay that isn’t tied to order volume — a founder’s draw booked as a cost, a virtual assistant, or salaried customer service.
Building your real variable cost per order
Variable cost per order is where most break-even estimates fall apart, because "cost of goods sold" is only one of four or five components that actually scale with each sale:
What the product actually costs to produce or buy, at the volume you’re currently ordering — not a supplier’s best-case bulk quote you haven’t hit yet.
What it costs to get the product to the customer, whether charged to them or absorbed. Varies by weight, zone, and carrier contract.
Commonly 2.9% + $0.30 per transaction for card payments through Shopify Payments or Stripe — on a $52 order, that’s roughly $1.81, easy to forget entirely.
If using a 3PL, a per-order handling fee on top of the storage minimum already counted in fixed costs — commonly $2-$5 per order for a small parcel.
Boxes, mailers, inserts, tape — commonly $0.75-$2 per order depending on product size and unboxing design.
If ad spend is being allocated per order rather than tracked separately, it belongs here too — see the ad spend section below for why most operators track it separately instead.
Add all of these up per order, not per month — variable cost is defined as the cost that scales with each individual sale, which is exactly why it belongs in the denominator of the break-even formula rather than the numerator. A number built from only COGS and nothing else will consistently understate variable cost per order by 20-40%, which pushes the resulting break-even estimate well below what the business actually needs to sell.
A full worked example
A small DTC brand selling a $52 product adds up its fixed costs: $79/month for Shopify, $300/month for a 3PL storage minimum, $250/month across its app stack, $120/month for insurance, and a $4,200/month founder draw booked as a fixed labor cost. That totals $4,949/month, rounded to $5,200 to leave a buffer for small subscriptions that get missed on the first pass.
Variable cost per order comes to $23.50: $14 in COGS, $6.50 in outbound shipping, $1.80 in payment processing, and $1.20 in packaging. That leaves a $28.50 contribution margin per order — a healthy 54.8% contribution margin ratio.
Break-even orders = $5,200 ÷ $28.50 = 182.5 → 183 orders a month, or roughly 6 orders a day. At a 2% site conversion rate, that's about 300 sessions a day needed just to clear fixed costs — a useful sanity check against actual traffic, since an order-count target alone can look deceptively small.
Selling above 183 orders doesn't just mean profit — it means each additional order past that point drops the full $28.50 contribution margin straight to the bottom line, since fixed costs are already covered. That's the operating leverage built into any break-even model with meaningful fixed costs: growth past break-even compounds faster than growth below it, which is exactly why getting the break-even number right matters more than it might seem for a single planning exercise.
Adjusting for returns and refunds
Most break-even calculations skip returns entirely, or mention them once in a caveat. For any category with a meaningful return rate — apparel and footwear routinely see 20-40% — that omission overstates the real contribution margin by a wide margin, not a rounding error.
Running the earlier example through a 25% return rate, typical for an apparel category, with a $10 return handling cost: adjusted revenue per order becomes $52 × 0.75 = $39. Subtract the same $23.50 variable cost and the return-rate share of handling cost (0.25 × $10 = $2.50), and adjusted contribution margin drops to $39 − $23.50 − $2.50 = $13 — less than half the original $28.50.
At that adjusted margin, break-even orders jump from 183 to $5,200 ÷ $13 = 400 — more than double. A category with a high return rate needs this calculation run explicitly; a category that rarely sees returns (consumables, low-cost accessories, most food and beverage products) can usually skip it without the result changing meaningfully.
The return rate itself doesn't need to be estimated blindly — most platforms report it directly. Shopify surfaces a return rate in its Returns dashboard once enough order history exists, and a store using a third-party returns app typically gets a more precise figure broken down by product or category. Pull the actual number rather than guessing; a category assumption that's off by even 10 percentage points meaningfully changes the adjusted break-even result above.
One-time purchase vs. subscription: different break-even question
A one-time product needs enough contribution margin on a single sale to be worth making at all. A subscription box asks a different question, because the first box often loses money once acquisition cost is included — profitability only shows up after a customer has stuck around for several billing cycles.
Take a $45/month subscription box with $18 in COGS and fulfillment per box — a $27 contribution margin per box, 60%. If it costs $35 in paid acquisition to land each new subscriber, the first box alone runs at a $27 − $35 = −$8 loss. That loss isn't a red flag on its own; it's recovered once the subscriber sticks around for a second box, since $35 ÷ $27 = 1.3 months of retention pays back the acquisition cost.
That payback question — how many billing cycles until CAC is recovered — is covered in full, with its own worked model, on the CAC payback period calculator. What still belongs here is the separate, ongoing question: once acquisition cost is paid back, how many active subscribers does the business need each month to clear its fixed costs? Using the $5,200 fixed-cost example from above against a $27 per-box contribution margin, that's $5,200 ÷ $27 ≈ 193 steady-state subscribers — a subscriber floor, not a one-time order count, and it doesn't reset every month the way a one-time-product break-even does.
Multi-channel selling: why a blended number misleads you
A brand selling the same product on its own Shopify site, on Amazon, and through a wholesale account is really running three different break-even calculations, because price and variable cost per order differ sharply across channels. A direct Shopify order loses roughly 3-4% to payment processing. The same product sold through Amazon FBA typically loses 25-35% of the sale price to referral and fulfillment fees combined before COGS is even subtracted. Wholesale flips the model entirely — a much lower price per unit, often 50% of retail, in exchange for volume and zero acquisition cost.
Put numbers on it: the same $52 product with a $23.50 variable cost needs 183 orders a month to break even direct on Shopify against $5,200 in fixed costs. Sold through Amazon FBA instead, a roughly 30% combined referral and fulfillment fee adds about $15.60 in variable cost, shrinking contribution margin to $12.90 — nearly 403 units to clear the same fixed costs, more than double, on the same underlying product.
Averaging all three into one blended price and cost produces a break-even number that doesn't actually describe any single channel, and can hide a channel that's quietly unprofitable on its own. The more reliable approach is running break-even separately per channel or per product line — which is exactly the multi-product break-even workflow available on a Calcority Pro plan, for brands that need to compare several channels or SKUs side by side and save the result.
Should ad spend count as variable cost?
If paid acquisition is a meaningful, per-order cost — a consistent blended CAC rather than an occasional brand-awareness spend — it belongs in variable cost per order, the same way payment processing does. Add it to variable cost per order and the break-even formula above already accounts for it correctly.
For the separate question of how ad efficiency itself relates to margin — what return on ad spend is required just to avoid losing money on a sale — that ratio is covered in full on the break-even ROAS calculator, including the exact formula and how it differs from a target ROAS goal. As a quick anchor: the same $52 product with a $28.50 contribution margin (before ad cost) has a break-even ROAS of 52 ÷ 28.50 ≈ 1.82x — meaning any campaign running below that return is losing money on every sale it generates, regardless of how the order-count break-even above is doing.
Common mistakes that quietly raise your break-even point
Hides which channel is actually profitable and which is being subsidized by the others — run break-even per channel instead, especially before deciding to scale ad spend on one of them.
Overstates contribution margin significantly in any category with a meaningful return rate; the adjustment above takes minutes to run and often changes the real break-even point by more than half.
A 2.9% + $0.30 fee looks small per order but compounds into a real margin gap at volume — on 1,000 orders a month it’s over $2,000 quietly missing from the calculation.
Gross margin often excludes shipping, packaging, and ad spend — all of which are real variable costs for break-even purposes, and leaving them out understates how many orders are actually needed.
A supplier price increase, a new software subscription, or a 3PL contract renewal all shift break-even, often unnoticed for months until margin has already quietly eroded.
Misses that acquisition cost is recovered over several billing cycles, not the first one — judging a subscription box on its first-order economics alone will make a profitable model look like a losing one.
What this calculator can't tell you
A break-even number is a planning estimate, not a guarantee, and it's worth being explicit about its blind spots. It doesn't tell you how long it will take to reach that order volume — that depends on traffic, conversion rate, and demand, none of which the formula knows about. It doesn't account for taxes; standard break-even is a pre-tax figure, and a business modeling after-tax cash needs a separate adjustment for its effective tax rate.
A blended break-even across multiple SKUs with different margins can look healthy overall while masking a specific product that's losing money on every sale — the multi-channel section above applies just as much across a product catalog as it does across sales channels. And a break-even calculation says nothing about the cash conversion cycle: a store can be profitable on paper and still run out of cash if money is tied up in inventory and receivables longer than fixed costs can wait, which is a separate question worth checking against a cash conversion cycle calculation once volume is meaningful.
Frequently asked questions
The categories are the same — costs that don't move with order volume — but the line items differ. An online store swaps rent and in-store staff for platform subscription fees, warehouse or 3PL storage minimums, and the software stack (email marketing, reviews, helpdesk). A store with no physical location can still carry meaningful fixed costs once the app and tooling bill is added up; it's just easy to under-count because no single item feels large on its own.
The formula is identical — fixed costs divided by contribution margin per unit. What's different is what belongs in variable cost per order: payment processing fees, pick-and-pack or 3PL fulfillment, and often paid acquisition cost, none of which show up in a textbook manufacturing example. A generic break-even calculator that only asks for 'variable cost per unit' will understate the real number for most online stores unless those pieces are added in manually.
Substantially, because the price and variable cost per unit are both different on each channel. Amazon's referral and FBA fees typically eat 25-35% of the sale price before COGS is even subtracted, while a direct Shopify order might lose only 3-4% to payment processing. Wholesale sits at the other extreme — a much lower price per unit in exchange for volume and zero acquisition cost. Blending all three into one number hides which channel is actually carrying the business.
More than most break-even math accounts for. A 25% return rate on a product with an otherwise healthy 55% contribution margin can cut the real contribution margin by more than half once lost revenue and return-handling costs are factored in — see the worked example above. Categories with high return rates (apparel, footwear) need this adjustment; categories that rarely see returns (consumables, low-cost accessories) can often skip it without materially changing the result.
There's no universal number — it depends entirely on fixed costs, which vary by an order of magnitude between a solo founder running lean and a brand carrying a 3PL contract and salaried staff. What is consistent is the shape of the answer: a founder with under $1,000/month in fixed costs and a healthy margin can break even in the low tens of orders per month, while a brand carrying $5,000-$10,000 in fixed costs needs several hundred. Run the actual numbers above rather than anchoring to an industry rule of thumb.
Variable, in almost every case, because the quantity used scales directly with orders shipped. The exception is packaging bought in a large one-time bulk order — that upfront cash outlay is a working-capital event, not a monthly fixed cost, and should be amortized across the units it will actually package rather than dumped into either bucket wholesale.
A one-time product needs enough contribution margin on a single sale to be worth making. A subscription box often runs at a loss on the first box once acquisition cost is included, and only becomes profitable after a customer sticks around for several billing cycles — which is a customer acquisition cost payback question, not a single-order break-even question. See the worked comparison above for both calculations side by side.
A single break-even number calculated from an averaged price and cost across the whole catalog will be wrong for every individual product, and can mask a low-margin bestseller quietly dragging down overall profitability. The more reliable approach is running break-even per SKU or per product line, then looking at the blended picture — which is exactly what a multi-product break-even model is built for.
At minimum once a quarter, and immediately after any of three events: a supplier price change, a shift in ad costs or blended CAC, or a new fixed cost being added (a new software subscription, a headcount hire, a 3PL contract renewal). Fixed and variable costs both drift quietly over a few months, and a break-even number calculated six months ago is often 10-20% out of date by the time it's checked again.
No — standard break-even, including the calculator above, is a pre-tax figure comparing revenue against operating costs only. A business that wants an after-tax break-even number needs to divide its fixed costs by (1 minus its effective tax rate) before running the formula, since tax owed on any eventual profit isn't itself a fixed or variable operating cost in the usual sense. Most operators use pre-tax break-even for day-to-day pricing and volume decisions, and reserve after-tax modeling for annual planning.
Run your own numbers above, free, or see break-even worked for four other industries side by side in break-even analysis examples.
Glossary:Break-Even Point,Contribution Margin,Fixed Costs
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