ROAS Calculator: Return on Ad Spend & Break-Even

Advertising performance tool

ROAS Calculator

Calculate return on ad spend, ACOS, contribution after ads, break-even ROAS and a target ROAS based on unit economics.

Formatting only; no exchange-rate conversion.

Actual campaign

Use the same attribution window and scope as ad spend.
COGS, payment fees, fulfillment and other costs that vary with these sales.
Used only for cost per acquisition.

ROAS and break-even formulas

  • ROAS = attributed revenue ÷ ad spend
  • ROAS % = ROAS × 100
  • ACOS = ad spend ÷ attributed revenue × 100
  • Contribution after ads = revenue − variable costs − ad spend
  • Break-even ad spend = revenue − variable costs
  • Break-even ROAS = revenue ÷ break-even ad spend

ROAS measures attributed revenue, not profit. A campaign can have a ROAS above 1 and still lose money after product, payment, fulfillment, shipping, returns, agency or overhead costs.

Target ROAS from unit economics

Pre-ad contribution = order revenue − variable costs per order

Allowable ad spend at target = pre-ad contribution − order revenue × target margin

Target ROAS = order revenue ÷ allowable ad spend at target

Maximum CPC = allowable ad spend per order × purchase conversion rate

If costs leave no positive pre-ad contribution, there is no finite break-even ROAS. If the target margin consumes all pre-ad contribution, no positive advertising spend can meet that target.

Checked examples

InputsCalculationResult
$50,000 attributed revenue, $10,000 ad spend and $25,000 variable costsROAS = 50,000 ÷ 10,000; contribution = 50,000 − 25,000 − 10,0005.00× ROAS, 20% ACOS and $15,000 contribution after ads
$100 order revenue and $60 total variable costs before adsPre-ad contribution = $40; break-even ROAS = 100 ÷ 402.50× break-even ROAS and 40% break-even ACOS
Same $100 order, $40 contribution, 15% target margin and 2.5% conversion rateAllowable spend = 40 − 15 = $25; target ROAS = 100 ÷ 25; max CPC = 25 × 2.5%4.00× target ROAS, 25% target ACOS and $0.63 maximum CPC

What to include in revenue and costs

  • Use revenue and spend from the same channel, date range, currency and attribution window.
  • Use net sales when discounts, cancellations and returns materially change realized revenue.
  • Include product cost, transaction fees, fulfillment, shipping subsidies and other truly variable order costs in break-even planning.
  • Keep agency fees and creative costs separate unless they vary with the campaign and you deliberately include them in the analysis.
  • Compare platform-attributed ROAS with blended business results; attribution systems can credit the same sale differently.

ROAS, ACOS, ROI and profit

ROAS compares revenue with advertising spend. ACOS is the reciprocal percentage: a 4.00× ROAS equals 25% ACOS. ROI uses profit or net gain relative to an investment, so it requires a broader cost base. Contribution after ads subtracts the variable costs entered here, but it is still not net profit because fixed overhead, salaries, tax, financing and other costs may remain.

Limits and assumptions

  • Monetary inputs must be 0 through 1 trillion; ad spend and order revenue must be greater than zero where used.
  • Attributed orders are optional whole numbers from 1 through 1 billion.
  • Target margin and purchase conversion rate accept 0% through 100%.
  • Maximum CPC assumes each conversion produces one average order and the entered conversion rate remains constant.
  • The model does not estimate attribution quality, incrementality, customer lifetime value, repeat purchases, returns or fixed costs.
  • Currency selection changes formatting only. No exchange rates are applied.

Important: this is an educational advertising model, not a guarantee of campaign profitability. Reconcile platform attribution with order, refund and accounting records before changing budgets or bids.

Frequently asked questions

Is a 4.00× ROAS good?

It means $4 of attributed revenue per $1 of ad spend. Whether that is profitable depends on contribution margin, returns, overhead and attribution quality. Compare it with your calculated break-even and target ROAS rather than a universal benchmark.

Why is break-even ROAS higher when margin is lower?

A lower pre-ad contribution leaves less money available for advertising. Because allowable ad spend falls, the revenue earned per advertising dollar must rise to break even.

Can ROAS be below 1 and still be acceptable?

Direct-response revenue would be below ad spend, but a business may still accept it for a deliberate acquisition strategy if reliable lifetime contribution covers the loss. This calculator does not assume future customer value.

What is the difference between ROAS and blended ROAS?

Platform ROAS uses revenue attributed by one advertising platform. Blended ROAS usually divides broader business revenue by total advertising spend. Do not combine a narrow spend figure with broad revenue without labeling that scope.

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