What Attach Rate Measures
Attach rate is the percentage of primary-product deals that also include a specific add-on or service, calculated as attached deals divided by total deals in the same period. It tells you how often a core sale pulls a second line item with it. A 40% attach rate on premium support means 40 of every 100 new customers buy support at the point of sale.The metric applies to any secondary offer sold alongside the core product, from premium support and extra modules to implementation and onboarding services. Each offer has its own attach rate, and tracking them separately beats one blended number because the levers and the margins differ.
How to Calculate Attach Rate
Attach Rate = Deals Including the Add-On / Total Deals in PeriodReport it per add-on and per motion, because a module that attaches at 15% on new logos can attach at 45% inside the installed base.
| Add-On | Deals With Add-On | Total Deals | Attach Rate |
|---|---|---|---|
| Premium support | 62 | 140 | 44% |
| Analytics module | 28 | 140 | 20% |
| Implementation services | 119 | 140 | 85% |
Leverage on Deal Size
Attach rate is one of the cheapest ways to raise average deal size, because it adds revenue to a deal the rep already won. If your core product sells for $30,000 and a $10,000 module attaches at 40%, blended average deal size rises to $34,000 with no new pipeline and no added acquisition cost. Move that attach rate to 60% and average deal size reaches $36,000. Pipeline count and win rate stay flat, so the gain drops almost entirely to bookings.
This is why attach rate belongs inside deal-size decomposition. Average deal size moves for two reasons: the core price changes, or the attach mix changes. Separating the two tells you whether growth came from pricing power or from packaging.
Leverage on Margin
Attach economics depend on what gets attached. Software add-ons carry gross margin close to the core product, so every attached module drops high-margin revenue straight through. Services attach differently. Implementation and onboarding carry lower gross margin than software and sometimes run at cost. Their payoff is indirect. Services attach raises adoption and time-to-value, which protects renewals and future expansion.
That split changes how you read the number. A rising software attach rate improves margin now. A rising services attach rate can hold margin flat this period while strengthening retention later. Judge each attach stream against the outcome it drives, not against one revenue goal.
Frequently Asked Questions
What is a good attach rate?
It depends on the add-on and how it is packaged. Near-mandatory services like implementation attach at very high rates because customers cannot deploy without them. Optional modules start lower and climb as the catalog matures and reps learn to position them. Track the trend for each add-on rather than chasing a single target.
What is the difference between attach rate and cross-sell rate?
Attach rate measures add-ons sold at the point of the core sale, inside the same transaction. Cross-sell rate measures different products a customer buys later, across the life of the account. Attach rate is a packaging and quoting metric. Cross-sell rate is an account-growth metric.
Does a higher attach rate always improve margin?
No. Software add-ons usually improve margin directly because they carry gross margin close to the core product. Services attach can hold margin flat or lower it in the current period while raising adoption and retention. Read the number against what is being attached.
How do you increase attach rate?
Put the add-on in the default quote so reps sell against it instead of remembering to add it. Set incentives on attached bookings, not core bookings alone. Trigger in-product prompts when usage signals a fit, and keep the add-on catalog small enough for reps to position with confidence.
Put these metrics to work
ORM builds custom revenue forecast models that turn concepts like attach rate into prescriptive action for your team.
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