What Is ROAS and What Is a Good ROAS for Online Sellers?

ROAS, or Return on Advertising Spend, is a key metric for online sellers to evaluate the effectiveness of their marketing campaigns. It shows how much revenue is generated for every pound spent on advertising. Understanding ROAS allows sellers to optimise campaigns, set budgets, and identify profitable channels.

This guide explains how to calculate ROAS, interpret results, identify what a good ROAS looks like for online sellers, and integrate product costs, fees, and margins to assess true profitability.

1. Understanding ROAS

ROAS measures the efficiency of advertising spend. Unlike general ROI, ROAS focuses purely on ad performance, not overall business profit. The formula is straightforward:

ROAS = Revenue from Ads ÷ Advertising Spend

For example, spending £200 on Facebook Ads that generate £1,000 in sales results in a ROAS of 5:1.

2. ROAS vs ROI

While ROAS measures revenue per ad spend, ROI considers net profit, factoring in costs like product manufacturing, shipping, and marketplace fees. Both metrics are useful, but ROAS is simpler for evaluating ad campaign performance.

Example Comparison

• Ad Spend: £100
• Revenue: £400
• Product + shipping costs: £200
• ROAS = 400 ÷ 100 = 4:1
• ROI = (400 - 100 - 200) ÷ 100 = 1:1

Here, ROAS suggests strong ad performance, but ROI shows actual profit is lower once costs are included.

3. What Is a Good ROAS for Online Sellers?

A good ROAS depends on product margins, business model, and advertising channels. Generally:

• Low-margin products may require ROAS 6:1 or higher.
• High-margin products can be profitable with ROAS 2-3:1.
• Marketplace fees, shipping, and discounts should always be included in calculations for realistic targets.

Benchmarking your ROAS against industry averages helps determine whether campaigns are performing efficiently.

4. How to Improve ROAS

• Target audiences more precisely to reduce wasted spend.
• Test ad creatives, messaging, and placements.
• Focus on high-margin products or bundles using the Bundle Pricing Calculator.
• Use promotional strategies carefully, and check impact with the Discount Calculator.

5. Including Product Costs and Fees

Standard ROAS ignores costs beyond ad spend. For online sellers, include:

• Product costs
• Shipping and fulfilment
• Marketplace fees: eBay Fee Calculator (UK), Etsy Profit Calculator (UK), Amazon FBA Fee Calculator

Adjusting ROAS for these expenses provides a more accurate measure of profitability and helps set realistic targets.

6. Practical Example

Suppose you sell a handmade candle:

• Ad spend: £100
• Revenue from ads: £500
• Product cost per unit: £5, 50 units sold
• Marketplace fees: £50

ROAS = 500 ÷ 100 = 5:1

Net profit = 500 - 100 - 250 (product cost) - 50 (fees) = £100

While ROAS looks strong, net profit is only £100, illustrating why including costs is critical.

7. Best Practices for ROAS Management

• Monitor ROAS per campaign, product, and channel.
• Combine ROAS with ROI to evaluate true profitability.
• Adjust ad spend or pricing if ROAS falls below target.
• Regularly update product costs and fees in calculations.
• Use the ROAS Calculator to simplify tracking.

8. Common Mistakes

• Evaluating ROAS without considering product costs or fees.
• Comparing ROAS across products with vastly different margins.
• Using ROAS alone to assess overall business health.
• Failing to benchmark ROAS against realistic industry standards.

9. FAQ

What is ROAS in online selling?

ROAS measures revenue earned for every pound spent on advertising to assess campaign effectiveness.

How do you calculate ROAS for online sellers?

Divide revenue generated from ads by the ad spend. Example: £500 revenue ÷ £100 spend = ROAS 5:1.

What is a good ROAS for online sellers?

It depends on margins, but generally 4:1-6:1 is considered healthy, with adjustments for costs and fees.

Does ROAS consider product costs and fees?

Standard ROAS does not; include costs to assess true profitability.

Are there tools to calculate ROAS for online sellers?

Yes. Use the ROAS Calculator to quickly compute ad efficiency and profitability.

Conclusion

ROAS is a vital metric for online sellers to evaluate advertising performance. A good ROAS depends on margins, fees, and business goals. Combine ROAS with ROI, include all costs, and use calculators and internal tools to optimise campaigns, improve profitability, and set realistic advertising targets.