See what your event is leaving on the table. Run the numbers →

Bookend
How it worksWho it's forThe mathFree toolsFAQGet started
See what you earn
← Free tools · Wedding room block calculator

Wedding room block calculator

Turn your guest list into travelling guests, rooms, and a block split across two hotels — plus what an 80% attrition clause would cost you at the pickup you actually expect.

Rooms to block10 + 6 rooms10 at the main hotel and 6 at the second property — 16 in total, sized 10% under the 18 rooms your guests are likely to actually take.
Guests needing a bed
77
Rooms your wedding creates
39
Rooms booked outside your blocks
21
Nights outside your blocks
42
Blended rate across both hotels
$199
Cost if you signed 80% and pickup lands here
nothing

At this pickup an 80% clause would be covered, so a contracted block is safe to sign here — the guarantee is the price of the rate, and you are clearing it. Either way 42 guest nights land outside your blocks, worth roughly $8,358, and today all of it goes to booking sites.

See how venues earn on that

Want this as a full breakdown for your market?

Every line item behind the number above, plus what we'd map for your area. No card, no call.

Start from the people who need a bed

The guest list is the wrong starting number and it is the one everybody starts from. A hundred and forty invitations might mean forty rooms or it might mean none, depending entirely on how many of those people are driving home afterwards. The only input that matters is the share of your list travelling in, and the only reliable source for it is your own list rather than an average.

From there the arithmetic is short. Travelling guests divided by guests per room gives the rooms your wedding genuinely creates. Two per room is the usual working figure: couples share, friends often pair up, and a handful of single guests and families pull the average in opposite directions. What you do with that room count is the part worth thinking about.

Why the block gets split across two hotels

Weddings sort their guests by budget more sharply than any other kind of event. Grandparents and the wedding party want to be where the party is and will pay for it. College friends want the cheapest room they can drive from. If the only thing you negotiate is a block at the venue hotel, the second group does not book a worse room at your hotel — they book a room at a different hotel entirely, through a booking site, at a rate nobody negotiated.

Splitting the block deliberately, with a nicer property and a value property a short drive apart, gets more of your guests inside blocks you control. It also keeps each individual block small, which matters if either hotel wants a guarantee: two blocks of twelve are a far safer position than one block of twenty-four.

Courtesy block first, contract only if you must

For most weddings the honest answer is that you should not be signing an attrition clause at all. A courtesy block holds the rooms and the rate and costs you nothing if they go unbooked. Hotels offer them routinely below roughly thirty rooms, and asking for one is not a difficult conversation.

A contracted block buys you a better rate and firmer availability, and charges you for the privilege if pickup disappoints. The calculator above prices exactly that trade: at the pickup you have entered, it shows what an 80% clause would leave you owing. When that figure is comfortably zero, a contract is safe. When it is four figures, the rate discount is very rarely worth it. The attrition calculator goes deeper into the clause itself, and the cut-off date calculator tells you when the deadline lands once you have signed.

The guests who book somewhere else

Whatever you block, a large share of your travelling guests will book outside it. They will use points, or a rental big enough for a family, or the hotel their cousin always stays at. Those nights are real, they happen because of your wedding, and they are worth more in total than the block usually is.

For a couple that is simply how it goes. For a venue, a planner, or anyone who hosts weddings for a living, it is a recurring, invisible revenue stream that leaves the building every weekend. That is the part Bookend exists to capture — see the guide to wedding guest lodging for how the whole picture fits together.

Inputs worth getting right

  • Travelling share. Count it off the actual list. It moves the answer more than anything else on the page and it is the input people guess at.
  • Guests per room. A wedding with lots of young single friends runs closer to two and a half; one with lots of couples sits at two.
  • Block share. Be pessimistic. If you have hosted a similar event, use what actually got picked up rather than what felt likely beforehand.
  • Nights. A Friday rehearsal dinner turns a one-night wedding into a two-night block, and blocks are guaranteed per night.

Common questions

How many hotel rooms should I block for a wedding?

Work from the travelling guests, not the guest list. Take the share of your list coming from out of town, divide by the guests who will share a room — two is the usual figure once couples and friends pair up — and then assume only a minority of them use your block at all. Contracting slightly under that number is safer than contracting over it, because a block that fills can nearly always be extended and a block that does not can turn into an invoice.

Should I block rooms at one hotel or two?

Two is the norm for a wedding, and it is why generic block maths comes out wrong. Guests self-sort by price: a portion want to be at the nice hotel where the party is, and a portion want the cheapest clean room within a short drive. Offering only the expensive option pushes half your guests onto booking sites, which is exactly where they stop being counted in your pickup.

What is the difference between a courtesy block and a contracted block?

A courtesy block holds rooms at an agreed rate with no financial commitment from you; unbooked rooms simply release at the cut-off date. A contracted block guarantees a percentage of the rooms and charges you damages on the shortfall if your guests do not book them. Courtesy blocks are common for weddings under about thirty rooms and are almost always the right choice when you are unsure of pickup.

What if nobody books the wedding block?

Under a courtesy block, nothing happens beyond losing the held rooms and the rate. Under a contracted block with an 80% clause, you owe damages on the gap between the rooms you guaranteed and the rooms actually booked, usually at or near the contracted rate for each night of the block. That gap is the number the calculator on this page prices for you before you sign anything.

How far in advance should a wedding room block be set up?

Six to nine months ahead is comfortable for most dates, and earlier matters more than it sounds in small towns, at destination venues, and on any weekend that also carries a race, a festival, or a graduation. The constraint is rarely the hotel's willingness; it is that the market around your venue sells out on exactly the dates your guests need.

Do wedding guests actually use the block?

Fewer than couples expect. Your block competes with every booking site, every loyalty programme, every rental listing, and every guest with family in town. Assuming that under half of your travelling guests will use it is realistic planning rather than pessimism, and it is the assumption that keeps you out of an attrition clause you did not need to sign.

If you host weddings, the overflow is yours to earn on

Bookend puts real places to stay in front of your guests at checkout, handles the booking, and splits the revenue with the venue. No inventory to hold, no clause to sign, no cost if nobody books.

See what you’d earn

More free tools

Room block attrition calculatorEnter your block, your clause and your pickup. See exactly what an unfilled room costs you.Room block size calculatorWork out how many rooms to contract for — and how many nights your attendees will book somewhere else.Room block cut-off date calculatorFind your cut-off date, the pace your pickup needs to hit before it, and what stopping here costs.