Thumbstop rate: definition, formula, and why it is not enough

Compare it with

• Thumbstop rate tells you whether the ad stopped the scroll. CTR tells you whether the message earned a click. CVR tells you whether the traffic actually converted.
• A stronger thumbstop rate can still be a commercial downgrade if CTR, landing-page fit, conversion rate, or contribution margin gets worse.

Measured as

Measure Thumbstop rate: definition, formula, and why it is not enough with a fixed attribution window, conversion event, and spend basis before comparing campaigns or creative tests.

Misused when

• Optimizing to thumbstop while ignoring whether clicks or conversions improve.
• Comparing thumbstop across platforms or placements with different definitions and autoplay behavior.
• Assuming a high thumbstop rate means the message, offer, and landing page are all working.

Operator takeaway

• Compare thumbstop only within the same platform, placement, and viewing threshold.
• Use it as an upstream input to CTR and CPC, not as the business outcome.
• Watch trend direction to spot creative fatigue before CPA or MER deteriorates.
• Use Thumbstop rate: definition, formula, and why it is not enough only inside a stable attribution rule, conversion definition, and time window so campaign comparisons stay honest.
• If performance changes, check whether the metric moved for a real business reason or because the measurement setup changed underneath you.

Next decision

• Quantify the impact with Break-even CTR Calculator if you need to turn the definition into an operating assumption.
• Read Frequency and creative fatigue: diagnose performance decay and fix it if the decision depends on interpretation, policy, or trade-offs beyond the raw formula.