Ask any established cake maker how they price their cakes and you'll hear the same phrase over and over: "per portion". It's the model professional bakeries use because it scales, it explains itself, and it stops you undercharging on big cakes.
This guide explains what per-portion pricing is, how to work out yours, and what the realistic UK ranges look like in 2026.
What "per portion" actually means
You quote by the slice, not by the cake. A finger-width slice of a 6" round cake is roughly 1 portion. A 10" round gives about 40 portions. A wedding tier chart works the same way — everything reduces to a portion count.
Set a price per portion for your business, multiply by portion count, and you have a starting quote. Then adjust for complexity, delivery, and rush fees.
Wedding portions: 1" × 1" × cake height — a small "finger" of cake
Party portions: 2" × 1" × cake height — twice the size, closer to what people actually eat
Ask which the customer wants. It doubles your portion count either way.
Portion count by cake size
Round cakes, 4" tall, standard buttercream finish, party portions:
| Size | Party portions | Wedding portions |
|---|---|---|
| 6" round | 10–12 | 15–20 |
| 7" round | 14–16 | 22–28 |
| 8" round | 20–24 | 32–40 |
| 9" round | 25–30 | 40–48 |
| 10" round | 32–38 | 50–60 |
| 12" round | 45–55 | 70–85 |
Square cakes give about 25% more portions than the same-size round. Deeper cakes (6" tall for a "tall tier") give roughly 1.5× the portions.
How to work out YOUR price per portion
Here's the honest method. Take your last five completed cakes and work out, for each:
- Total cost (ingredients + labour + overheads)
- Portions
- Cost per portion (£total ÷ portions)
Then apply your target margin to get selling price per portion:
Worked example
An 8" two-tier vanilla & lemon: total cost £155, 30 party portions = £5.17 cost per portion.
At 40% margin: £5.17 ÷ 0.60 = £8.62 per portion. So an 8" giving 24 portions would sell for ~£207.
What UK bakers actually charge per portion in 2026
Real prices from around the UK cake circuit right now. These are for classic buttercream celebration cakes with moderate decoration:
| Baker type | Per-portion range |
|---|---|
| New home baker, testing pricing | £3.50 – £5.00 |
| Established home baker with a following | £5.50 – £8.00 |
| Serious semi-pro, wedding cakes, in-demand | £8.00 – £12.00 |
| Boutique/proper bakery in London | £12.00 – £22.00+ |
Add-ons that push your per-portion price up:
- Fondant covering instead of buttercream: +£1–£2/portion
- Sugar flowers, hand-painted work: +£2–£4/portion
- Tall tier (6" high): +£1/portion (more sponge, more filling)
- Gluten-free, vegan, dairy-free: +£1–£1.50/portion (ingredients cost more)
- Wedding season / peak dates: +10–25% loading
Set your per-portion price once. Quote in seconds.
QuoteBake tracks the cost per portion of every recipe, so your quotes scale automatically as sizes change.
Try QuoteBake free →Why per-portion beats per-cake pricing
Two big reasons:
It stops you undercharging on big cakes. A 12" cake takes way more than 2× the work of a 6" — more baking, more filling, more decorating surface. Per-portion pricing keeps the maths honest as size grows.
It's easier to explain. "£8 per portion, feeds 40 people, so £320" is a story a customer understands. "£320 for a cake" without context feels like a mystery number.
And it forces you to think in the units your customers care about. Nobody buys a cake because they want a cake. They buy it because they've got 40 people coming and they need each of them to have some.
When per-portion pricing goes wrong
Two failure modes to watch for:
- Small cakes get too cheap. A 6" cake at £5/portion works out at £50 — but the labour is easily 4 hours. Solution: set a minimum order value (many bakers use £80 or £100) and never quote below it, even if per-portion maths says less.
- Complex cakes need per-cake supplements. A carved unicorn cake is 20 portions of buttercream but 15 hours of work. Per-portion pricing alone will underprice it. Add a "complexity supplement" line — £50, £100, £200 — for cakes that break the mould.
Quick reference — the per-portion cheat sheet
| Type | Sensible 2026 range |
|---|---|
| Simple buttercream celebration cake | £5–£8/portion |
| Semi-naked with fresh flowers | £7–£10/portion |
| Fondant-covered themed cake | £8–£12/portion |
| Wedding cake, multi-tier, sugar flowers | £10–£15/portion |
| Bespoke sculpted/character | £12–£20/portion + supplement |
If you're consistently under those ranges, you're either subsidising your customers or you haven't done the maths properly. Usually both.
QuoteBake stores your per-portion price and tier sizes so every quote adds up automatically. Free for 5 quotes.