Marginal ROAS: evaluate additional advertising spend
Calculate revenue change per added spend and distinguish a before-and-after comparison from a causal incremental return.
10 focused guides
Budgets, offers & experiments
Use a specific hypothesis and a bounded comparison. These guides help you assess a proposed change without assuming that a larger basket, higher ratio or bigger budget guarantees more contribution.
A useful reading order
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Ad budget from a revenue target: a planning model
Translate a revenue objective into a spend scenario, then check margin, conversion assumptions, and the limits of linear scaling.
ROAS sensitivity analysis: test your assumptions
Vary conversion rate, order value, click cost, and contribution margin to understand a campaign model without inventing forecasts.
Low ROAS: diagnose the cause before changing ads
Check measurement, traffic cost, conversion rate, order value, and margins in a logical sequence before selecting an intervention.
ROAS experiments: plan a test you can interpret
Plan a bounded advertising experiment with consistent measurement, cost-aware outcomes, and honest treatment of uncertainty.
Target vs actual ROAS: goals, bidding and results
Understand the difference between an economic requirement, a platform bidding target, and the ROAS actually reported.
Free-shipping thresholds: compare contribution
Evaluate whether a higher basket value covers the shipping subsidy, extra product costs, and possible conversion changes.
Creative-level ROAS: compare more than a ranking
Compare advertising creatives with attention to delivery mix, sample size, conversion delay, and contribution rather than a raw ROAS leaderboard.
Stockouts and ROAS: account for availability
Investigate how unavailable products, substitutions, and changing product mix affect observed advertising returns.
Seasonal ROAS: compare holidays and promotions
Separate calendar changes, discount economics, and conversion timing when interpreting seasonal advertising performance.
ROAS on TikTok Shop: What Changes in the Math
ROAS is still revenue over ad spend on TikTok Shop — but a 6% referral fee and creator commissions come off each order first. Worked math included.
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ROAS fundamentals · Margins & acquisition costs · Traffic & conversion metrics · Attribution & data quality