Chocolate Cost Per Piece: Batch Size and Yield (UK)
Why batch size and reject rate move the cost per piece more than couverture does.
The short answer
Cost per piece is the whole batch cost divided by the good pieces it yields. Because tempering, moulds and setup cost the same however many pieces come out, batch size and reject rate move the figure far more than the price of couverture does. Doubling a batch can cut the cost per piece by a quarter without changing a single ingredient.
Step by step
- Total the batch. Ingredients plus tempering, moulds, setup and finishing time.
- Count the good pieces, not the cavities. Rejected shells, air bubbles and trimmings all reduce the yield without reducing the cost.
- Divide to get cost per piece. That is the figure your margin should be applied to.
- Test a bigger batch before changing the price. If the same tempering serves twice the pieces, the cost per piece falls and the price may not need to.
One recipe, three batch sizes
Tempering and setup held at £22; ingredients, cases and finishing scale with the count. Rejects are excluded here so the batch-size effect is visible on its own.
| Line | Amount |
|---|---|
| 24 pieces | £1.51 per piece |
| 48 pieces | £1.05 per piece |
| 96 pieces | £0.82 per piece |
| Ingredients per piece, unchanged | £0.38 |
Between a 24 piece run and a 96 piece one the cost per piece falls by nearly half, purely because the tempering is spread further. That is the argument for batching a range on one tempering rather than making each flavour separately.
Why it matters
Chocolatiers often chase ingredient savings while running batches too small to pay for the tempering. Seeing the cost per piece at different batch sizes turns production planning into a pricing decision rather than a scheduling one.