ROAS Calculator: Return on Ad Spend

ROAS (Return on Ad Spend) is the revenue generated for each dollar spent on ads. It is the simplest way to compare channels and campaigns on payback.

How to calculate ROAS

ROAS = Revenue / Ad Spend

Worked example: Revenue $12,000 from $3,000 in ad spend.

ROAS = 12,000 / 3,000 = 4.0× (400%)

Your ROAS is 4.0×. With a 60% gross margin, break‑even ROAS is 1 / 0.60 = 1.67×. Anything below that loses gross profit.

What to do with the result

• Use break‑even ROAS to set floors in bid strategies.
• Pair ROAS with LTV to decide how aggressive you can be in acquisition.
• Investigate anomalies: rising ROAS with falling volume can hide tracking drift or modelled conversions changes.
• Explore more calculators on the Tools index.
• Related reads: LTV Calculator, CTR Calculator, CPM Calculator.

Common mistakes and when not to trust ROAS

• Revenue, not profit: High ROAS can still lose money at low margins or with high COGS/fees.
• Last‑click bias: Branded search looks fantastic but is often non‑incremental; test holdouts.
• Ignoring returns/cancellations: Subtract returns or your ROAS is fiction.
• Subscription lag: ROAS on first order ignores future churn or expansion; use LTV‑based guardrails.
• Attribution windows: Mismatched windows across platforms inflate or deflate ROAS.

Second example (margin realism): ROAS 2.0× on $1,000 spend → revenue $2,000. With 30% margin, gross profit = $600. Net of ad spend, −$400. ROAS looks fine; profit says stop.

Run your own numbers

Try the free ROAS Calculator to compute ROAS and break‑even ROAS from your margin.