Group Wash Factor Calculator
Estimate how many rooms a group will actually use each night, how many to release to general inventory, and how much group revenue is at risk.
| Night | Rooms blocked |
|---|---|
| Night 1 | |
| Night 2 | |
| Night 3 | |
| Night 4 | |
| Night 5 |
How to use the free Group Wash Factor Calculator
- Enter your figures in the fields above – use real numbers from your PMS, channel manager or accounts.
- Tap the button to see the result instantly. Change any value to compare scenarios.
- Copy, print or save the result and use it in your daily or monthly review.
This Group Wash Factor Calculator runs fully in your browser on mobile or desktop – no sign-up and nothing is uploaded. Free group wash factor calculator for hotels. Enter block per night and past wash % to see expected pickup, rooms to release and group revenue at risk.
What wash means for a group block
Wash is the share of a group block that is never used. Organisers often ask for more rooms than they finally need: delegates cancel, two people share a room, or attendees book elsewhere. If you hold the full block until arrival, you may end up with empty rooms that you could have sold to other guests.
Expected pickup = Block × (1 − Wash %)
Example: a past conference blocked 120 room nights and used 102, a wash of 15%. If you use a 12% wash on a new block of 40 rooms, expect about 35 rooms to be picked up and plan to release about 5.
How to use the wash factor
- Collect blocked and picked-up room nights for similar past groups: same organiser, same segment or same season.
- Use an average wash, or a cautious one if past results vary widely.
- Enter the block per night. Peak nights of a multi-night event usually wash less than shoulder nights, so check them separately if your data allows.
- Release the expected unused rooms at the cut-off date, or in stages if pickup is clearly slow.
Wash, attrition and forecasting
Wash is your internal forecast. Attrition is the contract term that decides what the organiser pays if pickup falls short. A hotel can expect a 12% wash and still have a 10% attrition clause; the gap is a risk you carry knowingly. Include only expected pickup, not the full block, in your occupancy forecast so your rate decisions for other segments are based on realistic numbers.
- Check the contract terms with the group displacement calculator before accepting a large block.
- Add expected pickup to your hotel occupancy forecast.
- Watch group pickup week by week with the booking pace calculator.
Wash patterns differ by market and segment, so build your own history rather than relying on a general figure.
Frequently asked questions
What is a good wash factor for hotel groups?
There is no single figure. It depends on the segment, organiser and season. Use your own history of blocked versus picked-up room nights for similar groups and update it after every group.
Is wash the same as attrition?
No. Wash is the hotel's forecast of unused rooms. Attrition is the contract allowance after which the group pays for unused rooms. Both use similar numbers but serve different purposes.
When should washed rooms be released?
Usually at the cut-off date, when unclaimed rooms go back to general inventory. If pickup is clearly behind, some hotels release part of the block earlier with the organiser's agreement.
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