MarketinGO

    Free tool

    Ecommerce Break-Even ROAS & MER Calculator

    Find the ROAS you actually need to make money, check if your current ads are profitable, and measure your true blended MER. Contribution margin math, not platform vanity numbers.

    Your break-even ROAS and CPA, built from real per-order unit economics.

    %
    Break-even ROAS
    Aim for break-even x 1.3-1.5
    2.25

    Below 2.25 you lose money on every order. In practice, aim for 1.3 to 1.5x this number so each order leaves real profit.

    Break-even CPA (max per order)$35.60
    Landed cost per order$44.40
    Contribution profit per order$35.60
    Gross margin44.5%

    Want us to run these numbers on your real account?

    We will audit your ad accounts for free and show you exactly where the ROAS and MER math breaks in practice.

    Why break-even ROAS beats platform ROAS

    This break-even ROAS calculator answers the question every store owner should ask before scaling spend: what ROAS do I actually need to make money? Ad platforms happily report a 4.0 ROAS while the business loses money, because platform numbers ignore your margins and over-attribute revenue. The number that decides profit is your contribution margin: what is left of each order after product costs, shipping, and payment fees.

    Break-even ROAS is simply 1 divided by that margin. A 40% margin store breaks even at 2.5, so a "great" 2.2 ROAS is quietly losing money on every order. And for scaling decisions, blended MER (total revenue over total marketing spend) beats platform ROAS every time, because it cannot be inflated by attribution double-counting. This tool gives you all three views in seconds.

    How to use it

    1. What ROAS do I need? Enter your AOV, product cost per order, shipping and fulfillment cost, and payment fee percentage. You get your break-even ROAS and CPA from real unit economics. Add a monthly revenue goal to see the ad budget ceiling it needs.
    2. Am I profitable right now? Add your ad spend and your current ROAS (or revenue), plus any management fee. Your AOV and gross margin carry over from the first tab, so you only enter them once. You get your real net profit, ROI, and profit per order.
    3. MER: my true efficiency. Enter total revenue and total marketing spend across every channel, plus margin and optional fixed costs. You get your blended MER, your break-even MER, and your net marketing profit.

    How to read your results

    • Break-even ROAS is your floor. Any campaign running below it loses money on every order it drives, whatever the dashboard says.
    • Never run at break-even. Break-even ROAS is a floor, not a target. Aim for 1.3 to 1.5x it so every order leaves real profit; running right at break-even means one slow day becomes a loss.
    • Net profit and profit per order show whether today's performance works. Green means you have room to scale. Red means fix margin, AOV, or creative before adding budget.
    • MER vs break-even MER is the honest scaling signal. If MER is comfortably above break-even, push spend. If it is below, more budget just buys bigger losses. Improve margin or cut wasted channels first.

    The formulas, shown plainly

    Landed cost per orderCOGS + Shipping + (AOV x Payment fee %)
    Contribution profit per orderAOV - Landed cost per order
    Gross margin %Contribution profit per order / AOV
    Break-even ROAS1 / Gross margin %
    Break-even CPAContribution profit per order
    MER (blended)Total revenue / Total marketing spend
    Break-even MER1 / Gross margin %
    Net marketing profit(Total revenue x Gross margin %) - Marketing spend - Fixed costs

    Break-even ROAS by gross margin

    Gross marginBreak-even ROAS
    50%2.0x
    40%2.5x
    33%3.0x
    25%4.0x
    20%5.0x
    10%10.0x

    Break-even ROAS is purely a function of margin: 1 divided by gross margin. The thinner your margin, the higher the ROAS you must demand from every campaign.

    2025-2026 ecommerce benchmarks

    MetricBenchmark
    Blended MER3.0 to 5.0 for most ecom brands
    MER, lower-margin categories (beauty)Around 3.0
    MER, higher-margin categories (fashion)5.0 or more
    Target ROASBreak-even ROAS x 1.3 to 1.5
    LTV:CAC for DTC4:1 to 5:1 target, 3:1 healthy floor

    General industry ranges, not guarantees. Your own break-even numbers, from the calculator above, always come first.

    Frequently asked questions

    You need a ROAS above 1 divided by your gross margin. At a 40% margin that is 2.5, at 50% it is 2.0, and at 25% it is 4.0. Anything below that number means you lose money on every order, no matter how good the ROAS looks in the ad platform.

    Divide 1 by your gross margin expressed as a decimal. First find your contribution profit per order (AOV minus product cost, shipping, and payment fees), divide it by AOV to get your margin, then take 1 divided by that margin. Example: a $35.60 contribution on an $80.00 AOV is a 44.5% margin, so break-even ROAS is 2.25.

    MER (marketing efficiency ratio) is total revenue divided by total marketing spend across every channel. Platform ROAS only counts the revenue each ad platform claims for itself, and platforms over-attribute and double-count across channels. MER uses your real revenue and your real spend, so it is the number that actually maps to profit.

    For judging overall profitability, yes. MER cannot be inflated by attribution tricks because it is built from your bank-account numbers. Platform ROAS is still useful for comparing campaigns inside one channel, but scaling decisions should be made on MER and contribution margin.

    Most ecommerce brands target a blended MER between 3.0 and 5.0. Lower-margin categories such as beauty often sit around 3.0, while higher-margin categories such as fashion push past 5.0. Your own floor is your break-even MER, which is 1 divided by your gross margin.

    Profitable DTC brands target a lifetime value to acquisition cost ratio of 4:1 to 5:1, and 3:1 is the healthy floor. Below 3:1, repeat purchase rate or acquisition cost needs work before you scale spend. Strong retention lets you outbid competitors profitably.

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