To split kids party costs between families, agree the method before you send any invitations. The simplest fair way is to share the fixed costs (venue, entertainer) equally and split the food and cake by how many children each family invites.
A short scene from the car park
It is two weeks before the party. Two mums are chatting at the school gate and one says, "Why don't we do one party for both of them?" Everyone nods, and nobody mentions money.
Three weeks later there is a receipt for the soft play, another for the cake, and an awkward silence about who owes what. A joint party is a great idea. The money part just needs ten minutes of honesty at the start.
Three ways to divide a joint kids' party
Most families end up with one of these. Each is fine, as long as everyone agrees before the invitations go out.
1. Split everything equally
Each family pays half (or a third, or a quarter). This is the easiest option and works well when both families invite a similar number of children.
2. Split everything by guest count
Each family pays in proportion to the children it invites. It is fair, but it treats the venue like a per-head cost, which it usually is not.
3. Mix the two
Fixed costs are shared equally and per-child costs follow the guest count. This is usually the fairest, and it is the one used in the tables below.
Cost by family: two families sharing a party
Here is a worked example with made-up numbers, in euros. The venue is 160, the entertainer is 180, food is 120 and the cake is 40, so the total is 500. Family A invites 12 children and Family B invites 8, so 20 in all.
Food works out at 6 per child and cake at 2 per child.
| Cost | How it is split | Family A (12 kids) | Family B (8 kids) |
|---|---|---|---|
| Venue (160) | Equal | 80 | 80 |
| Entertainer (180) | Equal | 90 | 90 |
| Food (120) | Per child | 72 | 48 |
| Cake (40) | Per child | 24 | 16 |
| Total (500) | 266 | 234 |
For comparison, a plain 50/50 split would be 250 each. Splitting purely by guest count would be 300 for Family A and 200 for Family B.
Three families sharing: who pays what
With three families the guest counts matter more, because the gap between the biggest and smallest list grows. This example is in pounds. The venue is 210, the entertainer 195, food 150 and cake 45, so the total is 600.
Family A invites 10 children, Family B invites 6 and Family C invites 8, so 24 in all. Food is 6.25 per child and cake is 1.875 per child.
| Cost | Family A (10 kids) | Family B (6 kids) | Family C (8 kids) |
|---|---|---|---|
| Venue (210, equal) | 70.00 | 70.00 | 70.00 |
| Entertainer (195, equal) | 65.00 | 65.00 | 65.00 |
| Food (150, per child) | 62.50 | 37.50 | 50.00 |
| Cake (45, per child) | 18.75 | 11.25 | 15.00 |
| Total (600) | 216.25 | 183.75 | 200.00 |
Rounding to the nearest pound (216, 184, 200) is perfectly fine. Just make sure the three amounts still add up to 600.
Try the group event calculator
What if one family invites extra children?
This is the most common snag. A good rule is to share the main guest list, then charge a per-child amount for any extra friends or cousins a family adds later.
In the two-family example, a per-child cost of 8 (food plus cake) is a sensible price for each extra guest. Say it up front so nobody feels singled out.
Decide the small things too
Money arguments rarely come from the big bills. They come from the loose ends nobody discussed.
- Gifts. Say on the invitation that guests bring a gift for each child being celebrated.
- Siblings and parents. Decide whether brothers, sisters and adults are counted as guests for food.
- Deposits. Agree who puts the deposit down and when the others pay them back.
- Goody bags and decorations. Either share them equally or let each family bring its own.
- Cancellations. If a booked child drops out, the cost is shared, not charged back to one family.
If gifts are collected from parents for a class or a friend group, our guide to collecting money for a group gift may help.
A message to send to the other parents
Put the plan in writing in your group chat before anything is booked. It keeps things friendly and gives everyone something to point to later. Copy and adjust this.
Hi both! So excited for the joint party. Suggestion for the money: we split the venue and the entertainer equally, and we split food and cake by how many kids each of us invites. I will pay the deposit and keep the receipts, and we can settle up within a week after the party. Extra guests are about 8 each on top. Does that work for you?
Keep a simple record as you go
One parent usually ends up paying most of the bills. Keep every receipt in one place and note who paid what, so settling up takes minutes rather than a series of awkward reminders.
A spreadsheet works. Evens, a shared-expense app that is coming soon, can also do the sums: it tracks who paid, splits costs by exact amounts or shares, and shows each family what is left to pay. The guide to splitting birthday and event costs covers the wider picture for adult parties too.
Settling up after the party
Do it within a week, while everyone remembers the day fondly. Send each family a single amount rather than a list of receipts. If one parent paid everything, the others only pay that parent, not each other.
Try the group event calculator
Frequently asked questions
Should we split a joint kids' party 50/50?
Only if both families invite a similar number of children. If the guest lists differ a lot, share the fixed costs equally and split food and cake by guest count.
When should we agree who pays what?
Before invitations go out. Changing the plan after people have been invited is much harder.
Do guests bring one gift or two?
Ideally one for each child being celebrated. Put it on the invitation so it does not feel like a hint.
What if one family pays the deposit?
Note the amount, share it as part of the total, and pay that parent back soon after. Keep the receipt so everyone can see it.
Is a joint party really cheaper?
Usually, because fixed costs like the venue and the entertainer are shared. The saving depends on your prices, so add up your own numbers first.