Per 100g or Per Pack? Reading a Vending Snack Nutrition Label
A snack packet can show different nutrition figures for the same product: per 100g, per portion and sometimes per pack. None is automatically the amount you are about to eat. At a vending machine, first check what the number describes, then match it to the packet size.
Compare the same column
The FSAI explains nutrition labelling: the declaration gives amounts per 100g or 100ml, while additional portion information may also appear. For a like-for-like comparison between two similar snacks, use the same nutrient and the same basis on both labels.
For example, comparing the sugar per portion on one packet with the sugar per 100g on another can give a misleading impression. Write down the column heading along with the number. Check grams against grams, rather than comparing a weight with a percentage reference intake.
Work out the amount in your packet
For a ready-to-eat snack, multiply the per-100g figure by the pack weight in grams and divide by 100. An invented example: a 40g packet labelled 10g of sugar per 100g contains 4g of sugar in the full packet. These numbers illustrate the calculation; they do not describe a product sold on this website.
The equivalent calculation uses millilitres for a drink labelled per 100ml. Check whether the label describes the product as sold or after preparation before applying the calculation. Use the current packet rather than an old product photograph.
Check what a portion means
A labelled portion might be one biscuit, two pieces or part of a larger pack. Look for the stated portion size and number of portions. Buying one packet does not necessarily mean the manufacturer treats that packet as one portion.
A useful personal note therefore has three fields: the nutrient, the labelled basis and the amount you intend to consume. This prevents a later comparison losing the context of the original number. The calculation itself does not determine whether a food suits an individual’s dietary needs.
Ask for information before choosing
If the nutrition panel is hidden behind the machine’s glass, use current product information supplied by the operator or manufacturer. Avoid guessing from the front-of-pack design. Ingredient and allergen checks remain separate; our vegan and gluten-free label guide explains another common distinction.
For workplaces reviewing their snack range, include clear product information in the discussion with your vending service provider. Contact our team with the range and information needs at your site.