Break-even ROAS: the calculation before your next campaign

A campaign reporting 3× return on ad spend can be profitable for one product and unprofitable for another. The difference is the money left after fulfilling the order. Before choosing a target, calculate what your business can actually spend to acquire that order.

Start with an order, not a dashboard

Use net revenue after discounts and refunds, with a consistent treatment of taxes. Subtract the variable costs you incur when the order happens. These might include the product, packaging, payment fees, delivery subsidy, fulfilment and the expected cost of returns. Do not subtract advertising yet: you are finding the contribution available to pay for it.

Here is an illustrative order, not a Salfars customer result:

Order component	Amount
Net revenue	₹2,000
Product cost	₹800
Packaging and fulfilment	₹150
Shipping subsidy	₹150
Payment fees	₹60
Expected returns allowance	₹40
Contribution before advertising	₹800

The pre-ad contribution margin is ₹800 ÷ ₹2,000 = 40%. Spending ₹800 on advertising to acquire the order leaves nothing for fixed overhead or profit.

Calculate the advertising break-even point

Break-even ROAS = 1 ÷ pre-ad contribution margin, using the margin as a decimal. At 40%, the result is 1 ÷ 0.40 = 2.5×. The equivalent break-even acquisition cost is ₹800 for this order.

This is a contribution break-even calculation. It does not mean the business breaks even after salaries, subscriptions, rent or other fixed costs. If you need ₹200 per order for overhead and profit, your available ad spend becomes ₹600. Your corresponding revenue-to-ad-spend target is ₹2,000 ÷ ₹600 = 3.33×.

Avoid four common shortcuts

• Using the catalogue margin. A margin before shipping and returns overstates the amount available for ads.
• Using an average across incompatible products. A bulky product and a small accessory can have different delivery economics. Segment the calculation where it changes the decision.
• Counting future repeat orders as certain. Use observed customer cohorts and conservative assumptions before accepting a loss on the first order.
• Treating attributed revenue as incremental revenue. An ad platform's attribution window can include orders that would have happened without the ad. The margin calculation cannot resolve that causal question.

Turn the calculation into a campaign rule

Create a worksheet with net revenue, each variable cost, available contribution, desired retained contribution and maximum ad acquisition cost. Record the owner and review date. Revisit it when discounts, shipping costs or the product mix change.

During a promotion, run the numbers again. A 20% price discount can reduce the money available for acquisition by much more than 20% when fulfilment costs stay fixed. Explain the promotion economics before asking someone to increase the budget.

Use the calculator below for the simplest margin-based case. For a complete decision, compare it with your contribution after ads and weekly scorecard. Salfars can help frame a campaign analysis, but the costs and commercial assumptions remain yours to validate.

Further reading

Shopify's guide to marketing efficiency ratio explains why a broader revenue-to-spend view complements campaign-level ROAS. This article's worksheet and illustrative calculation are our own.