Salted, unsalted or spreadable butter for cooking?

Who is choosing butter?

The intended use matters: butter for pastry calls for different checks from a product kept for toast.

Home cooks making meals and bakes

For mash, sauces, pastry, cakes or roast vegetables, decide how much control you need over added salt. Tesco Groceries and Sainsbury's list unsalted and salted blocks with different salt declarations.

Households serving toast and crumpets

If spreading is the main use, compare block and spreadable formats rather than assuming similarly named products have the same ingredients. Tesco Groceries and Waitrose & Partners list these as distinct product types.

Shoppers checking ingredients and nutrition

Read the exact pack’s milk-allergen declaration and its saturates and salt figures per 100g. The Food Standards Agency identifies milk as a common ingredient in butter, while the NHS explains how to interpret per-100g nutrition labels.

What should you check?

Start with what the butter will do in the dish, then compare the label on the particular variant and pack size you plan to buy.

Unsalted block butter

Choose it when: you want to season pastry, sauces or mash separately.

Bear in mind: it will not provide the salt you might want when serving it on toast.

Salted block butter

Choose it when: you want butter that already contributes salt to toast or a finished dish.

Bear in mind: salt levels differ between products, so a recipe may need less added salt.

Spreadable product

Choose it when: spreading on toast or crumpets matters more than following a block-butter recipe.

Bear in mind: spreadable butter and butter-and-oil blends can have different ingredients from a block.

Priority	What to check	Your needs
Recipe seasoning	Read the ingredient list and salt figure per 100g. Tesco Groceries lists below 0.01g for Lurpak Unsalted 200g; Sainsbury's lists 1.2g for Lurpak Slightly Salted 200g and 1.7g for Anchor Salted 200g.	For pastry, sauces or mash, I want to know how much salt the butter contributes before seasoning the dish.
Product format	Identify whether the pack is block butter, spreadable butter or a butter-and-oil blend. Check its ingredients before using it instead of block butter in a recipe.	If it is mainly for toast, I care about spreading it; if it is for baking, I need the product type the recipe calls for.
Nutrition label	Compare saturates and salt on the same per-100g basis. The NHS describes more than 5g saturates or 1.5g salt per 100g as high; Sainsbury's lists 1.7g salt per 100g for Anchor Salted 200g.	I want to compare exact variants using the nutrition panel, not just a brand name or the front of the pack.
Milk ingredients	Read the current pack’s ingredients and allergen statement. The Food Standards Agency identifies milk as a common ingredient in butter.	When someone eating the food has a milk allergy, I need to establish what the particular product contains before serving it.
Pack and storage	Match the pack size to likely use and follow its refrigeration and freezing directions. Sainsbury's says its Anchor Salted 200g listing permits freezing for up to three months; do not apply that direction to a different pack.	For occasional cooking, I would rather choose a quantity I expect to use and check how that pack must be stored.

Common buying mistakes

Swapping salted and unsalted blocks without checking the recipe

The salt difference can change the seasoning of pastry, sauces or mash. Tesco Groceries lists below 0.01g salt per 100g for Lurpak Unsalted 200g, while Sainsbury's lists 1.7g for Anchor Salted 200g.

Use the salt figure on the exact pack and adjust separately added salt where the recipe allows.
Assuming a spreadable product is the same as block butter

Tesco Groceries and Waitrose & Partners distinguish blocks from spreadable products and butter-and-rapeseed-oil blends. A shared brand name does not establish identical ingredients.

For baking or sauces, check the product type and ingredient list against what the recipe specifies.
Skipping the allergen and nutrition panels

The Food Standards Agency identifies milk as a common butter ingredient. Salt also varies between variants, and the NHS advises comparing nutrition figures per 100g.

Read the current pack’s milk-allergen declaration, saturates and salt figures rather than relying on a previous purchase or a product image.
Choosing a large pack without considering storage

Retail listings include different block and spreadable pack sizes, which may suit different rates of use.

Choose a size that fits your planned meals and follow that pack’s refrigeration, date-label and freezing directions.

Brand and own-label references

These examples show why the precise product and variant matter more than the brand name alone.

Lurpak

Tesco Groceries and Sainsbury's list 200g unsalted and slightly salted blocks; Waitrose & Partners also lists Lurpak spreadable products.

The cited blocks declare their salt levels: Tesco Groceries lists below 0.01g per 100g for Unsalted, and Sainsbury's lists 1.2g for Slightly Salted.
Check the full variant name and format; “Lurpak” alone does not identify the salt level or whether the product is a block.

Anchor

Sainsbury's lists Anchor Salted Butter 200g as made with British milk; Waitrose & Partners also lists Anchor spreadable products.

The cited 200g block lists butter and salt, with freezing directions for that product.
Sainsbury's lists 1.7g salt and 52g saturates per 100g for this salted block; check the label when choosing it for a recipe.

Kerrygold

Tesco Groceries lists Kerrygold block-butter products in 200g and 500g sizes.

The listed sizes give shoppers more than one block-pack quantity to consider.
Check the ingredients, nutrition panel and storage directions on the exact Kerrygold variant rather than applying another product’s figures to it.

Tesco own-label butter

Tesco Groceries lists British Salted and British Unsalted block butter in 250g packs.

The separate salted and unsalted listings make it possible to choose a block format according to the recipe’s seasoning needs.
Read the individual pack label for its ingredients, nutrition and storage directions.

A Joybuy option for cooking

This ghee is an option for cooking with a butter-derived ingredient. It is distinct from the salted, unsalted and spreadable butter formats discussed above, so check the recipe before making a substitution.

Laila Pure Butter Ghee 500G

For cooking or baking with ghee rather than a conventional block of butter. This is a 500G pack; check whether ghee suits your recipe before substituting it for block butter, and read the pack’s milk-allergen information.

View on Joybuy

Questions about choosing and storing butter

Should I use salted or unsalted butter for baking and sauces?

Choose unsalted block butter when you want to add salt separately; use salted butter when its seasoning fits the recipe. Tesco Groceries lists below 0.01g salt per 100g for Lurpak Unsalted 200g, while Sainsbury's lists 1.2g for Lurpak Slightly Salted 200g and 1.7g for Anchor Salted 200g, so check the exact pack.

Can spreadable butter replace block butter in a recipe?

Not automatically. Tesco Groceries and Waitrose & Partners list block butter, spreadable butter and butter-and-oil blends as different product types; compare the ingredients and the recipe requirements before substituting one for another.

What should I check if someone has a milk allergy?

Check the ingredients and allergen declaration on the exact product before serving it. The Food Standards Agency identifies milk as a common ingredient in butter; a familiar product name is not a substitute for reading the current pack.

Can I freeze butter?

Follow the directions on the particular pack. Sainsbury's says its Anchor Salted Butter 200g may be frozen for up to three months, defrosted thoroughly in the fridge and not refrozen; those directions should not be assumed for another product.

What is the difference between a use-by and a best-before date?

GOV.UK explains that a use-by date concerns food safety, while a best-before date concerns quality. Follow the date and storage instructions printed on the butter pack you buy.