Breakeven ROAS: The Real Ecommerce Math Your Dashboard Hides

What is breakeven ROAS?

Breakeven ROAS is the return on ad spend at which one order produces exactly zero profit: the revenue covers VAT, product cost, shipping, fees, and the ad click that brought the customer, with nothing left. The formula is short: AOV divided by contribution margin per order. Everything difficult about it hides inside "contribution margin," because most stores compute that number from the revenue their ads dashboard shows, and the dashboard is lying to them politely.

TL;DR

• Breakeven ROAS = AOV / contribution margin per order. Breakeven CPA is the same fact in currency: it IS your contribution margin.
• VAT comes off the top before any margin exists. Your ads dashboard reports conversion value with VAT inside, so a breakeven computed from dashboard revenue is always too optimistic.
• Refused COD parcels produce zero revenue but bill you for shipping twice. At Bulgarian and EU rejection rates this alone can move breakeven by several tenths.
• Target ROAS should be derived from the net margin you want, not picked as a round number.
• The same math inverts into a launch plan: profit goal in, required spend, orders per day, and revenue out.
• We built all of this into a free breakeven ROAS calculator you can run in the browser, no signup.

The formula, without the optimism

Start with what the customer pays, because that is the only number that is unambiguous:

Net AOV        = AOV / (1 + VAT rate)
Margin         = Net AOV - COGS - fulfillment - payment fees - other variable
Real margin    = Margin x delivery rate - rejection rate x round-trip shipping
Breakeven ROAS = AOV / real margin
Breakeven CPA  = real margin

Two details in that block do most of the work.

VAT is not your revenue. At 20% VAT, one sixth of every "sale" your dashboard reports belongs to the state. A €40 order is €33.33 of actual revenue. Skipping this step is the single most common reason a store believes it is profitable at 2.0x while the bank account shrinks.

ROAS is still quoted on the gross number. Meta and Google report conversion value as the customer paid it, VAT included. So the breakeven ROAS you steer by in Ads Manager must divide the gross AOV by the net margin. You remove VAT from the margin side, not from the ROAS side. Most calculators get this half right and end up wrong in both directions.

A worked example with real-world drag

Take a plausible EU store, the same numbers our calculator boots with: €40 AOV at 20% VAT, €8 landed product cost, €5.50 pick-pack-ship, 1.5% payment and COD collection fees, €0.50 packaging.

Net AOV is €33.33. Subtract €8, €5.50, €0.60 of fees, and €0.50, and a delivered order carries €18.73 of margin.

A naive calculator stops there, or worse, skips VAT and announces a breakeven around 1.54x. Ship a month at 1.6x on that advice and the loss arrives with the courier invoice.

Now the part cash-on-delivery operators know in their bones: some parcels come back. At a 6% rejection rate with €7 round-trip courier cost per refusal, the expected margin per placed order drops to €17.19. That is the real number, and it prices the whole account:

• Breakeven ROAS: 2.33x as your dashboard reports it
• Breakeven CPA: €17.19 per order
• On net-of-VAT revenue the same breakeven reads 1.94x, which is why finance and media buying argue until someone writes the basis down

The distance between 1.54x and 2.33x is not a rounding error. It is the difference between scaling a winner and funding a leak.

From breakeven to target: margin first, ROAS second

Breakeven is a floor, not a strategy. The useful question is: what ROAS produces the net margin you actually want?

Decide the margin as a percent of revenue. Say 15% on that €40 AOV: €6 must survive per order. Subtract it from the €17.19 margin and €11.19 is what you may spend on ads per order. Divide: €40 / €11.19 = 3.57x target ROAS, with an allowable CPA of €11.19.

Run the same arithmetic at 10% and 20% and you get a ladder: the account is scale-aggressive below 3.2x, healthy around 3.6x, harvest-mode above 4.2x. Those thresholds come from your cost structure, not from a benchmark thread. When someone quotes a universal "good ROAS," they are guessing with confidence.

The launch-planning inversion

Everything above answers "am I profitable per order." The more valuable question for a new brand or product is the inverse: what would this launch require?

Fix three inputs: the net profit you want per month, the blended ROAS you honestly expect, and your fixed monthly costs. Each order nets its real margin minus its ad cost (AOV divided by expected ROAS). Divide the profit goal plus fixed costs by that per-order net, and the plan falls out: orders per month, orders per day, ad spend, revenue.

With the example store at 3.0x expected ROAS: each order nets €17.19 minus €13.33 of ads, €3.86. To bank €5,000 a month over €1,500 of fixed costs you need about 1,685 orders, 55 a day, roughly €22,500 in monthly spend producing €67,000 in revenue. Seeing "55 orders a day" on paper before spending a euro on creative is exactly the moment weak offers get fixed and strong ones get funded properly.

If the per-order net comes out at or below zero, no volume saves the plan. The answer is not "more budget," it is a better AOV, a cheaper box, a tighter rejection rate, or a different offer. Paper is the cheapest place to learn this.

Run your own numbers

The calculator embedded above runs this entire model live: VAT presets, payment and COD fees, rejection drag, a margin planner, and the launch inversion, with every scenario encoded in the URL so you can save and share it. It also lives at its own address if you want to bookmark or send it: the breakeven ROAS calculator. It is the same math we run before we touch an ad account, whether that is restructuring a Meta account or rebuilding the pages that set the AOV the whole equation stands on.

Free, no signup, built by people who pay Bulgarian courier invoices every month.