Attrition Formula in MICE & Hotel RFPs (Plain English Definition + Examples)
Definition
The attrition formula calculates the financial penalty owed when actual room pickup falls below the contracted block minus the attrition allowance — typically expressed as: penalty = (contracted block × (1 - attrition %)) - actual pickup, multiplied by the contracted room rate.
In day-to-day European event sourcing, attrition formula sits inside a broader workflow that includes the brief, the longlist, the shortlist, the contract negotiation, and the post-event reconciliation. Understanding it in isolation is not enough — what matters is how it interacts with the other levers a planner can pull. The definition above is the textbook version; the sections below explain how it actually behaves in real RFPs.
Why Attrition Formula matters
Most planners read attrition as a percentage and assume the math; few actually run the formula on their own RFP responses. The difference between an 80% and a 75% attrition allowance on a 200-room block at €189 over 2 nights is €7,560 of risk exposure. Knowing the formula transforms attrition from a vague clause into a quantified variable you negotiate explicitly.
Example
Contracted block: 220 rooms × 2 nights at €185/night. Attrition allowance: 80%. Actual pickup: 158 rooms × 2 nights. Penalty calculation: (220 × 0.80 = 176 protected rooms) - 158 picked up = 18 short × 2 nights × €185 = €6,660 attrition penalty. With 85% attrition, protected = 187, penalty = (187-158) × 2 × €185 = €10,730. A 5-point shift in attrition % = €4,070 difference.
Where Attrition Formula appears in contracts
The attrition formula is referenced in the room block and penalty sections of the contract — but rarely written explicitly. Always run the formula on best-case, expected, and worst-case pickup scenarios before signing; this often reveals that an 'industry-standard 80%' clause is materially risky for your event profile.
When reviewing a hotel proposal or contract draft, scan for attrition formula early — it is often easier to negotiate before the supplier has anchored on their preferred position. Easy RFP surfaces these terms in every comparison view so planners can spot deviations from market-standard ranges at a glance, rather than reading 14-page proposals line by line.