The Profit on Ad Spend formula, explained step by step

Profit on Ad Spend = ad-attributed gross profit ÷ ad spend. This guide breaks the formula into its inputs so you can compute it from your own store data with confidence.

By Catrinoiu Barna Alex Alin, Founder6 min read

Founder of Profit Bid. Builds Profit on Ad Spend tracking and profit-based bidding for ecommerce merchants and agencies.

Live profit view

See Profit on Ad Spend vs revenue-only reporting

Profit Bid connects store costs to ad spend so you bid on margin — not vanity Return on Ad Spend.

Profit vs ad spend → derived Profit on Ad Spend

  • Gross profit ($)
  • Ad spend ($)

Profit on Ad Spend is the ratio between these lines. As profit outpaces steady spend, Profit on Ad Spend climbs above 160%.

Track Profit on Ad Spend automatically from your store — upload profit conversions and scale winners with A/C/X labels.

The five inputs behind Profit on Ad Spend

Revenue is the ad-attributed order value. From it, subtract cost of goods sold, shipping cost or subsidy, payment and platform fees, and any refunds to reach ad-attributed gross profit.

Divide that profit by the ad spend that produced it. The result — usually shown as a percentage — is Profit on Ad Spend.

A worked example

Say ads drove $10,000 revenue on $2,500 spend. COGS was $4,200, shipping $900, fees $300, and refunds $500. Gross profit is $4,100.

Profit on Ad Spend = $4,100 ÷ $2,500 = 164%. The 400% Return on Ad Spend looked twice as good, but 164% Profit on Ad Spend is the number you can reinvest.

Step-by-step

Follow these in order — each step builds on the previous one.

  1. 1

    Pull ad-attributed revenue

    Export revenue attributed to ads for the period you want to measure.

  2. 2

    Subtract variable costs

    Deduct COGS, shipping, payment fees, and refunds to get gross profit.

  3. 3

    Divide by ad spend

    Gross profit ÷ ad spend = Profit on Ad Spend. Track it as a percentage over time.

Frequently asked questions

Common questions about this topic — tap to read answers.

Is Profit on Ad Spend a percentage or a ratio?

Both notations exist. 164% Profit on Ad Spend and 1.64x Profit on Ad Spend mean the same thing: $1.64 of gross profit per $1 of ad spend.

Where do I get COGS and fees?

From your ecommerce platform and payment processor. Profit Bid syncs them automatically so Profit on Ad Spend stays accurate.

Pricing

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Profit on Ad Spend Formula Explained — Step by Step | Profit Bid