King Arthur, a reasonably popular brand (sold at Safeway, etc) here in the US does indeed show the % protein on the packaging: https://www.kingarthurflour.com/p

King Arthur, a reasonably popular brand (sold at Safeway, etc) here in the US does indeed show the % protein on the packaging: https://www.kingarthurflour.com/products/signature-flours/ https://www.kingarthurflour.com/products/signature-flours/ Most products also show this on the nutritional label.