Shoppers avoiding a specific allergen
Start with the ingredients and precautionary statement on the exact pack. Compare its calories only if those details meet your requirements.
Who is this for?
An allergen check and a calorie comparison answer different questions. Both matter when you are choosing a particular flavour and pack size.
People choosing a whole bag as one snack
An individual inner bag gives you a declared portion to compare. Check its full-bag calories rather than estimating a serving from a sharing pack.
Shoppers comparing salt as well as calories
Read the salt and calorie figures separately. A reduced-salt claim does not answer either the allergen question or the calorie question.
What should you check first?
Screen the exact flavour for your allergen, then compare the portion you would eat. Use the per-100g figure when different bag sizes make per-bag totals hard to interpret.
| Priority | What to check | Your needs |
|---|---|---|
| Allergen suitability | Read the current ingredients, emphasised allergens and any precautionary statement for this flavour. A free-from claim concerns only the allergen it names; GOV.UK explains that regulated allergens used as ingredients must be identified on prepacked-food labels. | I need to check my particular allergen before deciding whether this pack is an option. A gluten-free or vegan description alone cannot settle a different allergy question. |
| Calories per portion | Compare kcal for the complete inner bag and its weight. Check kcal per 100g separately to distinguish portion size from energy density. | For a whole-bag snack, I want to know what I will eat, not just the figure for an unspecified handful. Seabrook Crisps lists 126 kcal for its Lea & Perrins 25g bag; Walkers UK lists 128 kcal for Salt & Shake 24g and 132 kcal for Lightly Salted 25g. |
| Salt | Read the salt figure and the basis of any reduction claim, then check kcal independently. Walkers UK compares its Lightly Salted range with the average salt value of regular potato crisps. | If reducing salt matters to me too, I will not use that claim as a calorie shortcut. Walkers UK lists 132 kcal per 25g for Lightly Salted and 130 kcal per 25g for Ready Salted. |
Common buying mistakes
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Reading a dietary label as clearance for every allergen
A gluten-free claim addresses gluten, not every ingredient or potential cross-contact concern. GOV.UK guidance says a free-from claim applies to the allergen it specifies.
Check the complete label and any precautionary statement for the allergen relevant to you, including when another flavour from the same brand has been suitable.
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Calling a crisp low-calorie from its bag total alone
A smaller bag can have a lower total even when the crisp remains energy-dense. Seabrook Crisps lists 126 kcal for a 25g Lea & Perrins bag, while Walkers UK lists 128 kcal for a 24g Salt & Shake bag; those totals describe different portions.
Use kcal per bag to compare the snack you plan to eat, and kcal per 100g for a like-for-like comparison of the crisps.
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Assuming less salt means fewer calories
Walkers UK lists 132 kcal per 25g for Lightly Salted and 130 kcal per 25g for Ready Salted, despite the Lightly Salted range’s reduced-salt claim.
Compare salt and calories as separate label figures, after checking allergen suitability.
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Relying on an older online listing at the point of eating
An online description does not replace the details on the particular pack in your hand when you need to check an allergen.
Read the delivered pack’s ingredients and precautionary statement before eating it, especially if the flavour, pack size or recipe has changed.
Brand and product references
These examples concern named products or ranges, not every flavour a brand makes. Check the current label for the pack you choose.
Walkers
Small individual bags offer a direct per-pack comparison across the checked varieties.
- Walkers UK lists 128 kcal per 24g Salt & Shake bag and 132 kcal per 25g Lightly Salted bag.
- Joybuy’s listings for those products include precautionary allergen information; check the exact variety rather than treating the range as suitable for a particular allergy.
Seabrook
Lea & Perrins is a checked 25g potato-crisp bag with a declared calorie total.
- Seabrook Crisps lists 126 kcal per bag and describes this product as gluten-free.
- Gluten-free does not establish suitability for an unrelated allergen; read the exact pack’s ingredients.
Tyrrells
Its potato crisps and lentil crisps are different product types, so keep them separate when comparing labels.
- Tyrrells provides product-level allergy information for its Lightly Sea Salted potato crisps.
- That potato-crisp flavour carries a may-contain-milk statement, according to Tyrrells.
Kettle Chips
KETTLE Lightly Salted is a gluten-free potato-crisp option with a stated per-100g energy figure.
- Kettle Chips lists 516 kcal per 100g for this product.
- For a snack-sized comparison, measure the portion you would eat and check its current allergen label.
Pipers
Pipers identifies Anglesey Sea Salt and Upton Cheyney Jalapeño & Dill as gluten-free flavours.
- The individual product information provides energy figures for comparing the named flavours.
- A gluten-free description does not answer questions about other allergens or the calories in your chosen portion.
REAL Hand Cooked Crisps
REAL describes its range as gluten-free and vegetarian and publishes flavour-level product information.
- REAL lists 497 kcal per 100g for Jalapeño Pepper.
- Check that flavour’s current ingredients for the allergen you need to avoid; a range-wide gluten-free claim has a narrower meaning.
Portioned crisps on Joybuy
These Walkers multipacks offer individual bags for shoppers comparing a whole snack portion. Screen each flavour’s current allergen label before using its pack size or calorie figure to choose.
No image availableWalkers 45% Less Salt Mild Cheese & Onion 6 x 25g
The six individual 25g bags make this a portioned option when you are also looking at a reduced-salt variety. Check the Mild Cheese & Onion pack’s calories, ingredients and precautionary allergen statement separately; its salt wording does not establish a calorie figure or allergy suitability.
No image availableWalkers Salt & Shake Crisps 6 x 24g
Walkers UK lists 128 kcal per 24g bag; the salt comes in a separate sachet. The Joybuy listing carries a precautionary statement naming milk, wheat, gluten, barley, soya, celery and mustard, so check the delivered pack against your particular allergen.
No image availableWalkers Ready Salted Crisps 6 x 25g
The single-flavour pack contains six 25g bags, and Walkers UK lists 130 kcal per 25g for Ready Salted. Check this pack’s ingredients and any precautionary allergen statement before choosing it for an allergy-sensitive snack.
No image availableWalkers Salt & Vinegar Crisps 6 x 25g
This single-flavour multipack has six individual 25g bags. Read the Salt & Vinegar pack’s calorie declaration and allergen information rather than carrying figures or warnings across from another Walkers flavour.
No image availableWalkers Ready Salted/Cheese & Onion 12 x 25g
This variety pack combines two flavours in individual 25g bags. Check the ingredients, allergen statements and calories for each flavour separately; suitability or a calorie figure for Ready Salted should not be assumed for Cheese & Onion.
Frequently asked questions
How do I check a packet of crisps for my food allergy?
Read the current pack’s ingredients and any precautionary allergen statement for the exact flavour. GOV.UK guidance says that any of the 14 regulated allergens used as ingredients in prepacked food must be clearly identified in the ingredients list. Do not assume an older listing or another flavour has the same details.
Does gluten-free mean suitable for every food allergy?
No. A gluten-free claim concerns gluten, not milk, mustard, soya or every other allergen. GOV.UK guidance explains that a free-from claim applies to the allergen specifically named; check the rest of the label for your particular concern.
What does a may-contain statement mean if the allergen is not an ingredient?
It signals that the allergen could be unintentionally present. The Food Standards Agency’s guidance on precautionary allergen labelling describes this as a cross-contact consideration, so assess the exact statement against the allergen you need to avoid rather than treating an absent ingredient as an all-clear.
Does reduced salt mean fewer calories?
No. Walkers UK lists 132 kcal per 25g for its Lightly Salted product, which carries a reduced-salt claim, and 130 kcal per 25g for its Ready Salted product. Compare the salt and calorie declarations independently for the exact packs you are considering.
Why compare calories per bag and per 100g?
Calories per bag describe a whole individual portion; calories per 100g put different bag sizes on the same weight basis. If you plan to eat one complete bag, start with its declared total, then use the per-100g figure to see whether a lower total chiefly reflects a smaller portion.