An argument made against metric-only labelling in the US is that manufacturers would need to change packaging to rational metric sizes. Ronnie Cohen looks at the UK’s experience over the past 50 years.
On EU product labels, metric units are mandatory whereas non-metric units are optional. On US product labels, both metric and US customary (USC) units are mandatory for most products. So a company that wants to sell a product in the EU and the US must use metric and USC on the label unless it produces separate labels for the two markets.