⚖️ Comparison · Updated for 2026

Plain Flour (UK) vs All-Purpose Flour (US)

Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.

Quick answer: They are essentially the same product with different names. UK plain flour and US all-purpose flour both sit at roughly 9-12% protein content. Self-raising flour (UK) ≈ all-purpose + baking powder + salt — different product, don't substitute without adjustment.
Decision guide — when to use which
Use Plain Flour (UK) when…

Following UK recipes or buying flour at UK supermarkets like Tesco, Sainsbury's or Waitrose. Identical product, different name.

Use All-Purpose Flour (US) when…

Following US or Canadian recipes, or shopping on US websites. American baking books and food blogs all use "all-purpose flour".

📊 Side-by-side comparison
Aspect Plain Flour (UK) All-Purpose Flour (US)
Protein content 9-11% 10-12% (regional variation)
Bleached? Rarely (UK practice) Often (US practice)
Self-raising? No (plain) / Yes (self-raising) No (all-purpose)
Substitute Direct 1:1 Direct 1:1

Frequently asked

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Can I use US all-purpose in UK recipes?

Yes, 1:1 substitution. They're functionally the same. Note that some US all-purpose flour is slightly higher protein (10-12%) — for delicate cakes, UK plain (closer to 10%) gives a slightly tenderer result.

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What's the closest to UK self-raising flour in the US?

US 'self-rising flour' is the same concept. Or make your own: 1 cup plain flour + 1.5 tsp baking powder + ¼ tsp salt = 1 cup self-raising equivalent.

Reviewed for 2026. This comparison is general guidance based on publicly available information. Prices, rates, rules and specifications change, so check current details with the provider or an official source before making a decision. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project. We don't sell SEO links or accept paid placements in this content.

Frequently asked questions

Can I use US all-purpose in UK recipes?

Yes, 1:1 substitution. They're functionally the same. Note that some US all-purpose flour is slightly higher protein (10-12%) — for delicate cakes, UK plain (closer to 10%) gives a slightly tenderer result.

What's the closest to UK self-raising flour in the US?

US 'self-rising flour' is the same concept. Or make your own: 1 cup plain flour + 1.5 tsp baking powder + ¼ tsp salt = 1 cup self-raising equivalent.