What should you compare?
Start with kcal per 100g for a common comparison, then work out what the amount you would actually eat represents. NHS food-label guidance notes that nutrition is given per 100g and sometimes per portion.
| Priority | What to check | Your needs |
| Calories |
Compare kcal per 100g, then kcal for the weight you plan to eat. Check whether the labelled serving is the whole bag or only part of it. |
I want to know the calories in my tea-break portion, not just the figure printed for a smaller serving. |
| Pack format |
Check the weight of each individual bag or the number of servings in a sharing bag. Measure a portion before eating from a larger pack. |
A single small bag gives me a defined amount; with a sharing bag, I would rather decide my portion before opening it. |
| Fat and salt |
Read the fat and salt figures per 100g for comparison, and per serving where shown. Check the serving weight before comparing front-of-pack traffic-light labels. |
Calories are not the only label figures I want to consider when choosing a snack. |
| Dietary suitability |
Read the ingredients, allergen statement and any free-from or vegan wording for the exact flavour. Check the current pack if suitability is essential. |
I need the product to meet my dietary requirements, but I will assess its calories separately. |
Brand and product-line references
These examples show why serving size and per-100g figures need to be read together; they do not describe every product made by each brand.
Doritos
Flavoured tortilla chips with product-specific serving sizes and nutrition figures.
- Doritos UK lists 144 kcal per 30g serving and 479 kcal per 100g for Cool Original.
- Its Protein Chipotle product lists 195 kcal for a 48g bag; the protein figure does not make that bag a lower-calorie portion than Cool Original’s stated 30g serving.
Mister Free'd
Tortilla-chip options with dietary labels that should be checked product by product.
- Waitrose & Partners lists Chili at 95 kcal per labelled serving; its Blue Maize listing states gluten-free, wheat-free, dairy-free and soya-free.
- The same listings give 475 kcal per 100g for Chili and 521 kcal per 100g for Blue Maize. A free-from label is not a calorie comparison.
Old El Paso
Tortilla chips that can also be used for dipping or as part of a meal.
- Waitrose & Partners lists a defined 50g portion for Old El Paso Original.
- That portion is listed at 250 kcal, compared with 500 kcal per 100g; check whether 50g matches what you want for a tea break.
essential Waitrose
Salted tortilla chips with nutrition shown for a 25g serving and per 100g.
- Waitrose & Partners lists 122 kcal per 25g serving, a useful reference when measuring that amount.
- The product lists 489 kcal per 100g, so the serving figure should not be mistaken for lower energy density.
Joybuy snack options
These options include individual bags of tortilla chips, larger tortilla-chip bags to portion yourself, and one small-bag potato snack if you are open to something other than tortilla chips. Compare the nutrition label for the exact pack before choosing.
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Doritos Tangy Cheese 5 x 30g
The 5 x 30g format gives you a defined bag for a tea break. Check the pack’s kcal figure and allergen statement for this flavour.
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Doritos Chilli Heatwave 5 x 30g
Each bag in this 5 x 30g pack provides a defined portion. Use the Chilli Heatwave label, rather than another Doritos flavour’s figures, to check calories and allergens.
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PopChips Barbecue 5 x 17g
The 5 x 17g format offers a small individual bag if you are open to a potato snack instead of tortilla chips. Check its own nutrition label rather than comparing bag sizes alone.
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Eat Real Sea Salt Multiseed Tortillas 160g
This 160g bag lets you choose a smaller amount for a tea break, but you will need to portion it yourself. Check the exact pack for its serving weight, nutrition and dietary information.
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Eat Real Multiseed Tortillas Smoky Tomato Salsa Flavour with A Hint of Chilli 160g
Choose your serving from this 160g bag before eating. Check this flavour’s nutrition and ingredient label rather than assuming it matches the Sea Salt variant.
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Common questions
Are tortilla chips low in calories per 100g?
The products cited here are energy-dense per 100g: Doritos UK lists 479 kcal for Cool Original, while Waitrose & Partners lists 475 kcal for Mister Free'd Chili and 489 kcal for essential Waitrose salted chips. A smaller portion contains fewer calories than 100g of the same product, but does not change its per-100g figure.
Should I compare calories per serving or per 100g?
Use both: per 100g compares products on the same weight basis, while the figure for your intended portion helps you assess the snack you will eat. NHS food-label guidance says nutrition is given per 100g and sometimes per portion, so check the weight behind any serving figure.
How can I plan a tortilla-chip portion for a tea break?
Choose the amount before you start eating, then use an individual bag or put a measured portion from a larger bag into a bowl. Check the label against that amount: Waitrose & Partners lists 122 kcal for a 25g serving of essential Waitrose salted chips, whereas its Old El Paso Original listing gives 250 kcal for a 50g portion.
Does gluten-free, vegan or high-fibre mean fewer calories?
No: those labels address dietary suitability or fibre, not the calorie figure. Waitrose & Partners lists Mister Free'd Blue Maize as gluten-free and high in fibre, alongside 521 kcal per 100g. Check energy and serving weight separately.
What should I check if I have a food allergy?
Read the current ingredient list and allergen statement for the exact product and flavour, including any may-contain wording. Do not rely on the appearance of the chips or on the label of a different flavour.