# Wedding cost split calculator for two families

Canonical URL: https://www.evenoutapp.com/tools/wedding-cost-split-calculator
Updated: 2026-10-06

Split the costs that grow with guests by how many guests each side invited, and the fixed costs by a percent you agree on. Say $15,000 of per-guest costs for 120 guests is $125 a guest, and $9,000 of fixed costs is split equally. If side A invites 70 guests and side B 50, A pays $13,250 and B pays $10,750 of the $24,000.

Key points:
- Per-guest costs follow the guests each side invited. Fixed costs follow a percent the payers agree on.
- The example: $15,000 over 120 guests is $125 a guest, and $9,000 of fixed costs is split 50 and 50.
- Side A, with 70 guests, pays $13,250. Side B, with 50 guests, pays $10,750. Together that is $24,000.
- The calculator takes up to four payers, and the fixed-cost percents have to add up to 100.

## How do families split wedding costs by guest count?

Split the costs that grow with each guest by how many guests each side invited, and split the fixed costs by a percent everyone agreed to. The calculator works out each payer's part of both and adds them.

To sort a cost into a box, ask whether the bill would change if 20 more people were invited. Food, drink, favors and invitations would, so they go in the per-guest box. A flat-fee venue, the photographer and the music would not, so they go in the fixed box.

## How does the calculator work?

It takes up to four payers: the couple, each set of parents, a grandparent, anyone who agreed to pay.

1. Add up the guests from every payer, counting each guest once under the payer who invited them.
2. Divide the per-guest total by the guest total to get the cost per guest, and multiply that by each payer's guests.
3. Take each payer's agreed percent of the fixed total.
4. Add the two parts for each payer.

The fixed-cost percents have to add up to 100. If they do not, the calculator says so instead of guessing. A payer with 0 guests and 0 percent is left out.

## Worked example: $24,000 for two families

Say the per-guest costs are $15,000 for 120 guests and the fixed costs are $9,000, split equally. Side A invites 70 guests and side B invites 50. These are the numbers the calculator opens with, where payer 1 is side A and payer 2 is side B.

- Cost per guest: $15,000 ÷ 120 = $125.
- Guests: side A is 70 × $125 = $8,750 and side B is 50 × $125 = $6,250.
- Fixed costs: $9,000 × 50% = $4,500 each.

| Payer | For guests | Fixed | Pays |
|---|---|---|---|
| Side A (70 guests) | $8,750 | $4,500 | $13,250 |
| Side B (50 guests) | $6,250 | $4,500 | $10,750 |
| Total | $15,000 | $9,000 | $24,000 |

Side A pays $1,250 more than half of the $24,000. It invited 20 more guests than side B, which is $2,500 of per-guest cost, and half of that is $1,250.

## How do the other rules compare on the same $24,000?

The same $24,000 puts side A anywhere from $7,200 to $13,250 depending on the rule. Each rule is an agreement, and the table shows what each one costs a side.

| Rule | Side A pays | Side B pays |
|---|---|---|
| Guest count, fixed costs split equally (the example) | $13,250 | $10,750 |
| Equal halves | $12,000 | $12,000 |
| By income, say $60,000 and $90,000 so 40 and 60 | $9,600 | $14,400 |
| By what each side can give, say A gives $7,200 so 30 and 70 | $7,200 | $16,800 |

To try a rule other than the guest count, put the whole $24,000 in the fixed-costs box, set the per-guest box to 0 and type each payer's percent. A split by income is a [proportional split](https://www.evenoutapp.com/glossary/proportional-split), and the [percentage split calculator](https://www.evenoutapp.com/tools/percentage-split-calculator) takes any percents you like.

## What to settle before the first deposit

- **Which box each cost goes in.** Some costs sit between the two, so decide each one once and write it down.
- **Whose guests are whose.** The couple can be a payer too, with their own friends counted under them.
- **Who pays each vendor.** Whoever pays a deposit is owed the others' shares, so keep a note of who paid what.
- **The fixed-cost percents.** Write them down and check that they total 100.

## Mistakes to avoid

- **Putting a per-head venue charge in the fixed box.** A venue that charges by the head belongs in the per-guest box.
- **Counting a cost twice.** Each cost goes in one box, not both.

## Keeping a record in EvenOut

Make an "Event" group, add each payer, and add a guest for anyone who is not on EvenOut yet, so their share is tracked now and they can claim it later. When someone pays a vendor, add it as an expense with "Paid by" set to that person. Split per-guest bills with "Shares" and type each side's guest count as the shares, 70 and 50 here. Split fixed bills with "Percent" and type the agreed percents. Each person then sees what they owe or are owed with the others, and "Settle up" records a payment when one side reimburses another. EvenOut does not move the money.

The [wedding budget template](https://www.evenoutapp.com/templates/wedding-budget-template) is a printable version of the cost list, and [how couples split wedding costs](https://www.evenoutapp.com/guides/how-couples-split-wedding-costs) covers the split between the two partners.

## Frequently asked questions

### Who counts as a payer?

Anyone who agreed to pay: the couple, one set of parents, both sets, or a grandparent. The calculator takes up to four payers and assumes nothing about who they should be. Leave a payer's guests and percent at 0 if they are not in the split.

### What if a guest is invited by both sides?

Count each guest once, under one payer, and write down which. If a guest sits under both sides, both are charged for them and the per-guest total is shared over 121 names instead of 120, which is $123.97 a head instead of $125.

### What if the guest count changes after the first payments?

The per-guest part follows the final headcount, so change the guest boxes and run it again. The fixed part does not move. What each payer has already paid stays on record, and the difference between that and the new total is what is left to settle.

### Which box do the cake and the flowers go in?

Ask whether the price would change with 20 more guests. A cake priced by the slice goes in the per-guest box. A cake with one flat price goes in the fixed box, and so do flowers quoted as one package. Flowers priced per table follow the guests, so they go in the per-guest box.