ROAS (return on ad spend) is the metric every paid team reports, and it is also the metric that has been quietly lying to DTC founders for the last five years. A 3.0 ROAS sounds healthy — until you factor in a 55 percent gross margin, an 8 percent fulfillment cost, and a 3 percent payment fee, at which point the same 3.0 ROAS can be losing money per order. This calculator translates ROAS into actual profit. Enter your ad spend, revenue, gross margin percentage, and fulfillment cost percentage, and the tool returns your ROAS, gross profit, marketing efficiency ratio (MER), profit after ads, and break-even ROAS. It is designed for mid-market Shopify Plus brands who want to force their paid channels to report against profit, not vanity revenue multiples.
Fulfillment, freight, and payment fees as % of revenue.
ROAS
3.00×
Gross Profit
$82,500
Marketing Efficiency Ratio (MER)
3.00×
Profit After Ads
$17,500
Break-Even ROAS
2.22×
ROAS is revenue divided by ad spend. Gross profit is revenue multiplied by gross margin percentage. Profit after ads is gross profit minus revenue multiplied by fulfillment cost percentage minus ad spend — in other words, the dollars left over after COGS, variable fulfillment, and paid media. Marketing efficiency ratio (MER) is revenue divided by ad spend, same formula as ROAS but conceptually applied at the account level across all revenue, not just attributed revenue. Break-even ROAS is 1 divided by (gross margin percentage minus fulfillment cost percentage) — the minimum ROAS required just to avoid losing money on incremental ad spend after COGS and variable fulfillment. If break-even ROAS is 2.2 and your channel is reporting 2.0, you are losing money on every incremental dollar of ad spend regardless of what the paid team's dashboard says. This model uses gross margin and treats fulfillment as a percentage of revenue for simplicity. For a tighter unit-economics test, substitute contribution margin for gross margin and zero out the fulfillment line to avoid double-counting.
The hard truth is that most brands quoting 'a 2.5 ROAS is healthy' are operating below their break-even ROAS and do not realize it. At 55 percent gross margin and 10 percent fulfillment, break-even ROAS is 2.22 — so a 2.5 ROAS delivers a razor-thin 12 percent incremental margin on ad spend, and any deterioration in CAC or margin pushes the channel into negative territory. At 40 percent gross margin (more common in apparel and electronics), break-even ROAS jumps to 3.33, which means most paid channels are losing money outright. This is why MER has become the dominant metric at sophisticated brands: it captures the true relationship between paid spend and profit regardless of attribution. The test is simple: does your MER exceed break-even ROAS? If yes, incremental spend is accretive. If no, you are buying revenue at a loss and need to cut spend, raise margin, or both.
ROAS is calculated on revenue, which means any margin leak — a stacked discount, a freight zone miss, a high-return SKU — inflates revenue without delivering the profit the ROAS number implies. A paid team can hit a 3.0 ROAS target while the underlying orders ship at negative contribution margin, and the paid dashboard never notices. Agentis closes that gap. By enforcing a profit floor on every Shopify Plus checkout, it prevents the ad-driven orders that destroy unit economics, so the revenue that flows into your ROAS calculation is real profit-bearing revenue. The calculator translates ROAS into profit; Agentis makes sure the translation stays honest.
There is no universal answer because it depends on your margin structure. Compute your break-even ROAS first (1 divided by gross margin minus variable costs), and treat anything meaningfully above that as healthy. A 3.0 ROAS can be great for a 65 percent margin beauty brand and unprofitable for a 35 percent margin apparel brand.
ROAS is attributed to specific ad platforms; MER (marketing efficiency ratio) is total revenue divided by total ad spend across all channels. MER is more honest because it captures spillover between channels and avoids attribution double-counting. Most sophisticated brands now run on MER as the primary metric.
Break-even ROAS equals 1 divided by (gross margin percentage minus variable fulfillment and payment costs). At 50 percent gross margin and 10 percent variable cost, break-even ROAS is 1/0.40, or 2.5. Below that, incremental ad spend destroys profit.
Yes — routinely. If margin leaks from discount stacking, freight zone misses, or returns are not factored in, the ROAS number uses overstated margin and understates true loss. Agentis protects the margin number that feeds ROAS by enforcing a profit floor at checkout.
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Profit Governance
The minimum gross margin required before an order is confirmed at checkout. Orders falling below the profit floor are blocked, modified, or redirected.
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