Unit prices

Supplementary unit prices

Imperial unit prices are commonly shown as well as metric.

Supplementary price labels

These are allowed provided they are not more prominent than the metric ones. However, UKMA thinks that they are potentially confusing, as you cannot compare the imperial price with the charge shown on a receipt.

Why different units are used

Where possible, unit prices are per kilogram if weighed

Price label per kg

or per litre if by volume.

Price per litre

However, in some cases it is more consumer-friendly to use smaller units. For example the unit price for breakfast cereals is per 100 g because of the wide range of carton sizes on offer.

Price per 100 g

Likewise cooking oil has a unit price per 100 ml.

Price per 100 ml

The unit price for herbs and spices is 10 g because of the small weights involved.

Price per 10 g

Full details are given in Schedule 1 of the Price Marking Order.