⚖️ 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 have ~10-11% 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 | 10-11% | 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
?
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.
Reviewed for 2026. All conversion factors and historical references verified against official sources (ISO standards, government weights & measures legislation, IEC technical specifications). 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.