Comparing Salt Levels in Everyday Crisp Varieties

Why Salt Matters in a Bag of Crisps

Salt is the quiet workhorse of the crisp world. It sharpens the potato flavour, keeps the oil from tasting flat, and makes a bag genuinely hard to put down. But it also varies wildly from one variety to the next, and the difference is often bigger than people expect. A plain ready salted and a punchy salt & vinegar can sit on the same shelf at the same price and yet deliver very different amounts of the white stuff.

For anyone watching their intake, cutting back gently, or simply preferring a milder snack, that variation matters. UK adults are advised to keep salt below 6g a day, and a single 25g packet can quietly account for a noticeable slice of it. The good news is that you do not need a laboratory to get a feel for the differences. A kitchen, a bowl, and a bit of patience will do it.

The Home Test: What I Actually Did

The method is simple: dissolve the seasoning off the crisps, strain out the solids, dry the liquid, and weigh what is left. Here is the routine, refined after a few messy first attempts.

• Note the exact weight on the packet, ideally a 25g bag so comparisons stay fair.
• Tip the crisps into a bowl and crush them roughly with the back of a spoon.
• Add about 150ml of warm, not hot, water and stir for two minutes.
• Leave to stand for ten minutes so the salt has time to dissolve properly.
• Strain through a coffee filter or a double layer of kitchen roll into a shallow dish.
• Leave the dish somewhere warm and dust-free for a day or two, or in a very low oven with the door ajar, until only dry crystals remain.
• Weigh the residue on a jeweller's scale that reads to 0.01g.

One honest caveat: the residue is not pure salt. Sugars, flavourings, and acidity regulators dissolve too, so the figures run a touch high. Treat them as a comparison tool rather than a lab result, and you will get plenty of useful signal.

What the Numbers Looked Like

Across a run of everyday packets, the residue per 25g bag fell into fairly consistent bands. The spread is roughly four-fold, which is striking for products that look so similar.

• No-salt-added plain crisps: 0.03–0.06g
• Lightly salted: 0.15–0.22g
• Ready salted: 0.30–0.38g
• Cheese & onion: 0.32–0.40g
• Smoky bacon: 0.35–0.45g
• Prawn cocktail: 0.38–0.48g
• Salt & vinegar: 0.45–0.60g
• Salted tortilla chips: 0.25–0.35g per 25g portion

Put another way, that is often about 1.2g to 1.6g of salt per 100g for a standard ready salted, pushing towards 2g per 100g for the sharper, more heavily seasoned varieties.

Why Salt & Vinegar Sits at the Top

It is not an accident. Acidity needs salt to feel balanced, so a generous pinch is doing structural work rather than just sitting on the surface. Salt & vinegar seasoning is also usually applied as a powder that clings well, and some bags carry a double dusting so the flavour survives to the bottom of the packet. The result is a crisp that tastes bright and moreish but carries noticeably more salt than a plain one.

Prawn cocktail and smoky bacon land just below for similar reasons: the flavour profiles lean on salt to carry sweetness and smoke. Plain salted varieties, by contrast, have nowhere to hide, so they tend to be seasoned more modestly.

Portion Size Beats Per-100g Figures

The per-100g number on the back of a packet is useful, but it can mislead. A 25g multipack bag of a saltier variety may still deliver less total salt than a 50g sharing bag of a milder one. Multiply before you judge.

• 25g of a 1.8g per 100g salt & vinegar crisp: about 0.45g salt
• 50g of a 1.2g per 100g ready salted crisp: about 0.60g salt

That is why multipacks are quietly helpful. They enforce a portion, and a smaller portion usually wins on total salt even when the flavour is the punchier one.

Tasting Tips for Choosing Your Bag

Numbers only take you so far, because salt perception varies between people. A few habits sharpen your own judgement.

• Taste at room temperature, as cold dulls the seasoning.
• Sip water between varieties and wait a minute, so salt does not build up on your palate.
• Compare in pairs rather than a long line-up; two bags at a time keeps your reference point steady.
• Notice the aftertaste. Heavily salted bags tend to leave a dry, thirsty feeling that lingers.
• Check the label for salt per 100g and per pack, then decide which figure matters more for how you eat them.

If you love a full-throttle salt & vinegar, keep it, but enjoy it from a 25g bag with a drink alongside. If you want something you can graze on through a film, a lightly salted or no-salt-added bag will treat you better. Either way, you will now know roughly what you are getting before you open the packet.