How to Calculate Break-Even ROAS

If you are learning how to calculate BEROAS, the process has two stages. First find how much revenue remains after every non-ad variable cost. Then divide revenue by that remaining contribution margin.

Step 1: choose a representative order value

Use selling price for a single-product order or average order value when customers buy different quantities and products. The number should match the cost averages used in the next step.

If customer-paid shipping is recognized as revenue, include it consistently. Do not mix a gross order value with costs calculated for a different product or period.

Step 2: total non-ad variable costs

Add the costs that occur because the order exists: COGS, seller-paid shipping, fulfillment, payment processing, platform fees, agent fees, and other reliable per-order costs.

A percentage fee should be calculated from revenue. A 3% payment fee on a $50 order is $1.50. Add any fixed transaction fee separately.

Step 3: calculate contribution margin

Subtract the combined variable costs from revenue. Suppose a $50 order has $15 product cost, $5 shipping, and $3 in payment and other variable costs.

The order can support up to $27 in advertising cost before profit reaches zero. That makes $27 the break-even CPA.

Step 4: divide revenue by contribution margin

Divide $50 by $27 to get 1.8519. Rounded for planning, break-even ROAS is 1.85x. The campaign must produce more than $1.85 in attributed revenue for each $1 spent before the modeled order becomes profitable.

Alternative formula using margin percentage

If contribution margin percentage is already known, convert it to a decimal and take its reciprocal. A 54% contribution margin is 0.54, so 1 divided by 0.54 equals about 1.85x.

Step 5: compare actual and target ROAS

Actual ROAS above 1.85x is profitable under the inputs; actual ROAS below it loses money. A campaign exactly at 1.85x only breaks even. Use a higher target ROAS to reserve profit.

What to do with zero or negative margin

When variable costs equal or exceed revenue, there is no valid positive BEROAS. Do not accept Infinity, a negative ratio, or zero as a usable answer. Increase price, reduce cost, or change the offer before adding paid acquisition.

The manual method is useful for checking a model. Once you know how to calculate BEROAS by hand, use the homepage BEROAS calculator to compare percentage fees, fixed fees, target ROAS, current ROAS, and profit per order.