ROI vs ROAS: Which Metric Should You Track?

A marketing manager reports a 5x ROAS on their latest campaign. The CFO runs the full numbers and finds the company lost money. Both are right — they are just measuring different things. ROI (Return on Investment) measures net profitability after all costs, expressed as a percentage. ROAS (Return on Ad Spend) measures revenue generated per dollar of advertising spend only. You can have a strong ROAS but negative ROI if your other costs are too high. Use ROAS for campaign level optimization and ROI for business level profitability decisions.

According to WordStream research, the average Google Ads ROAS across industries is roughly 2:1, but this varies dramatically by vertical. Understanding when to use ROAS vs ROI prevents the common mistake of scaling campaigns that look profitable on a platform dashboard but lose money in reality.

Formulas and Use Cases Side by Side

Worked Example: Same Campaign, Two Stories

A Google Ads campaign produces these numbers:

In this case both metrics look healthy. But change the COGS to $20,000 and other costs to $12,000, and the ROAS stays at 4.0x while ROI drops to negative 5% — you are losing money despite a strong ROAS.

Minimum Viable ROAS by Margin

Decision Framework: When to Use Which

Multi-Channel Comparison: When Metrics Diverge

Here is how ROI and ROAS can tell completely different stories across three channels for the same business:

Facebook has the highest ROAS (5.0x) but the lowest ROI (14%) because the products sold through Facebook have lower margins and higher fulfilment costs. If you optimized purely for ROAS, you would scale the least profitable channel. This is why both metrics are necessary.

The Danger of Tracking Only ROAS

ROAS hides costs. A 5x ROAS sounds phenomenal until you realize your gross margin is 20% — meaning you only keep $1 of profit per $5 in revenue. After subtracting the $1 in ad spend, you are left with $0 profit on a "5x ROAS" campaign. Always pair ROAS with margin analysis to understand true profitability.

When to Use ROI and ROAS Together

The most effective marketing teams track both metrics at different levels. Use ROAS at the campaign and ad group level for day-to-day optimization decisions. Aggregate up to ROI at the channel and overall marketing level for strategic decisions about budget allocation.

A practical workflow: if ROAS drops below your minimum viable threshold (1 ÷ Gross Margin), pause the campaign immediately — it cannot be profitable. If ROAS is above threshold but ROI is negative, investigate non-ad costs (fulfilment, team time, tools) rather than the campaign itself.

The ideal reporting cadence: check ROAS daily or weekly for active campaigns, calculate ROI monthly or quarterly for channel-level decisions, and present ROI (not ROAS) to leadership and investors.

Common Mistakes

Using ROAS to justify scaling a campaign that is ROI negative. A 4x ROAS on a campaign with 15% gross margins means you are losing money on every sale. ROAS only looks at revenue vs ad spend. It does not account for product costs, fulfilment, overhead, or team time. Always validate ROAS with a full ROI calculation before scaling.

Comparing ROAS across products with different margins. A 3x ROAS on a high margin SaaS product (80% margins) is far more profitable than a 5x ROAS on a low margin physical product (20% margins). ROAS without margin context is meaningless for cross product comparisons.

Reporting ROI on a single campaign without full cost allocation. True ROI requires allocating all costs, including the team time spent managing the campaign, creative production, and tools. Many teams calculate a partial ROI that overstates the actual return.

Ignoring attribution windows. ROAS calculated on a 7-day attribution window will look very different from a 30-day window, especially for high-consideration purchases. Make sure you are comparing ROAS on the same attribution basis.

ROAS Benchmarks by Platform

Note: these benchmarks vary significantly by industry, average order value, and margin. Use them as directional guidance, not absolute targets.

For Businesses

Businesses embed both ROI and ROAS calculators on their website so visitors can compare scenarios and understand the difference between ad-level returns and true business profitability. These interactive tools capture real spend and margin data, providing your sales team with qualified leads who understand their own numbers.