{ "title": "Protein bar price study: October 2026 observations", "published_date": "2026-11-02", "label_snapshot_date": "2026-10-25", "observation_date_range": [ "2026-10-22", "2026-10-26" ], "qualification_checkpoint_date": "2026-11-02", "scope": "68 eligible protein-bar records from the 79-record dated value guide; not all market offers. No fresh price/stock audit.", "formula": "pack_price_gbp / bars_in_pack * 20 / protein_g", "precision": "Decimal calculations use 28 significant digits; displayed prices rounded to two decimal places.", "delivery_limit": "Source quote delivery treatment varies; no delivery fee, FX conversion or conditional discount added.", "statistics": { "records": 68, "brands": 26, "median_cost_per_20g": "2.464957264957264957264957264", "minimum_cost_per_20g": "1.253333333333333333333333333", "maximum_cost_per_20g": "8.050909090909090909090909091", "bands": [ [ "Under £1.50", 1 ], [ "£1.50 to under £2", 14 ], [ "£2 to under £3", 39 ], [ "£3 or more", 14 ] ], "lowest_price_per_bar_id": 276, "lowest_cost_per_20g_id": 290 }, "records": [ { "id": 290, "brand": "Powerbar", "range_name": "30% Protein Plus", "flavour": "Lemon Cheesecake", "weight_g": 55, "protein_g": 17, "kcal": 193, "pack_price_gbp": 15.98, "bars_in_pack": 15, "currency": "GBP", "offer_checked_at": "2026-10-25T02:17:00.000Z", "cost_per_bar_gbp": "1.065333333333333333333333333", "cost_per_20g_protein_gbp": "1.253333333333333333333333333", "product_url": "https://whichbar.co.uk/bars/powerbar-30-protein-plus-lemon-cheesecake", "nutrition_source": "https://www.mueller.de/p/powerbar-protein-plus-30-lemon-cheesecake-2027941/", "retailer_url": "https://www.amazon.co.uk/dp/B01700AEK8", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 282, "brand": "Powerbar", "range_name": "30% Protein Plus", "flavour": "Vanilla Coconut", "weight_g": 55, "protein_g": 17, "kcal": 195, "pack_price_gbp": 19.71, "bars_in_pack": 15, "currency": "GBP", "offer_checked_at": "2026-10-25T01:17:00.000Z", "cost_per_bar_gbp": "1.314", "cost_per_20g_protein_gbp": "1.545882352941176470588235294", "product_url": "https://whichbar.co.uk/bars/powerbar-30-protein-plus-vanilla-coconut", "nutrition_source": "https://www.powerbar.com/cdn/shop/files/8aaffa1a955a4d85928b38197f7c1d7d_0f067f82-8cff-45b6-9a4e-5db62eb44d9b.jpg?width=2000", "retailer_url": "https://www.amazon.co.uk/dp/B000H30WS0", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 429, "brand": "Grenade", "range_name": "Protein Bar", "flavour": "White Chocolate Cookie", "weight_g": 60, "protein_g": 23, "kcal": 215, "pack_price_gbp": 22, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-26T08:52:05.625113+00:00", "cost_per_bar_gbp": "1.833333333333333333333333333", "cost_per_20g_protein_gbp": "1.59420289855072463768115942", "product_url": "https://whichbar.co.uk/bars/grenade-protein-bar-white-chocolate-cookie", "nutrition_source": "https://www.grenade.com/products/protein-bar-white-chocolate-cookie", "retailer_url": "https://www.grenade.com/products/protein-bar-white-chocolate-cookie", "quote_source": "Grenade exact product page, standard one-time box price excluding delivery. Published product-widget rating and visible review count." }, { "id": 4, "brand": "Grenade", "range_name": "Protein Bar", "flavour": "OREO", "weight_g": 60, "protein_g": 21, "kcal": 233, "pack_price_gbp": 20.09, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-26T08:54:00.347Z", "cost_per_bar_gbp": "1.674166666666666666666666667", "cost_per_20g_protein_gbp": "1.594444444444444444444444445", "product_url": "https://whichbar.co.uk/bars/grenade-oreo", "nutrition_source": "https://www.grenade.com/products/oreo-protein-bar", "retailer_url": "https://www.amazon.co.uk/dp/B0BS49D1G5?th=1&psc=1", "quote_source": "Exact selected Amazon flavour and pack; ordinary one-time item price observed in browser. Delivery charges/eligibility may vary. Review summary for this selected listing." }, { "id": 288, "brand": "Powerbar", "range_name": "33% Protein Plus", "flavour": "Chocolate Peanut", "weight_g": 90, "protein_g": 30, "kcal": 351, "pack_price_gbp": 24.58, "bars_in_pack": 10, "currency": "GBP", "offer_checked_at": "2026-10-25T02:17:00.000Z", "cost_per_bar_gbp": "2.458", "cost_per_20g_protein_gbp": "1.638666666666666666666666667", "product_url": "https://whichbar.co.uk/bars/powerbar-33-protein-plus-chocolate-peanut", "nutrition_source": "https://www.powerbar.com/cdn/shop/files/ad7f2cda17da43fca431b475a4db881c_7d66bc08-aa59-44b1-b540-ea27cf93822c.jpg?width=2000", "retailer_url": "https://www.amazon.co.uk/dp/B00JBD666Y", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 275, "brand": "Powerbar", "range_name": "Protein+ Low in Sugars", "flavour": "Chocolate Espresso", "weight_g": 35, "protein_g": 11, "kcal": 108, "pack_price_gbp": 15.32, "bars_in_pack": 16, "currency": "GBP", "offer_checked_at": "2026-10-25T00:27:00.000Z", "cost_per_bar_gbp": "0.9575", "cost_per_20g_protein_gbp": "1.740909090909090909090909091", "product_url": "https://whichbar.co.uk/bars/powerbar-protein-low-in-sugars-chocolate-espresso", "nutrition_source": "https://www.powerbar.com/cdn/shop/files/c54a828ba48d48fe94a2d0dea921d324_5d89437e-18cc-48f7-aa25-0111e713ece6.jpg?width=2000", "retailer_url": "https://www.amazon.co.uk/dp/B09X77H93J", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 1, "brand": "Grenade", "range_name": "Protein Bar", "flavour": "Chocolate Chip Salted Caramel", "weight_g": 60, "protein_g": 21, "kcal": 222, "pack_price_gbp": 21.98, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-26T08:54:02.779Z", "cost_per_bar_gbp": "1.831666666666666666666666667", "cost_per_20g_protein_gbp": "1.744444444444444444444444445", "product_url": "https://whichbar.co.uk/bars/grenade-chocolate-chip-salted-caramel", "nutrition_source": "https://www.grenade.com/products/protein-bar-chocolate-salted-caramel", "retailer_url": "https://www.amazon.co.uk/dp/B084ZGV3Y7?th=1&psc=1", "quote_source": "Exact selected Amazon flavour and pack; ordinary one-time item price observed in browser. Delivery charges/eligibility may vary. Review summary for this selected listing." }, { "id": 455, "brand": "Born Winner", "range_name": "Mega Pro", "flavour": "Choco Chip Cookie", "weight_g": 85, "protein_g": 30.6, "kcal": 299.2, "pack_price_gbp": 32.64, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-24", "cost_per_bar_gbp": "2.72", "cost_per_20g_protein_gbp": "1.777777777777777777777777778", "product_url": "https://whichbar.co.uk/bars/born-winner-mega-pro-choco-chip-cookie", "nutrition_source": "https://www.bornwinner.bg/pokupka/12-x-born-winner-mega-pro-%D0%BF%D1%80%D0%BE%D1%82%D0%B5%D0%B8%D0%BD%D0%BE%D0%B2-%D0%B1%D0%B0%D1%80-%E2%80%93-%D0%B1%D0%B8%D1%81%D0%BA%D0%B2%D0%B8%D1%82%D0%BAa-%D1%81-%D1%88%D0%BE%D0%BA%D0%BE%D0%BB%D0%B0%D0%B4%D0%BE%D0%B2%D0%B8-461", "retailer_url": "https://www.amazon.co.uk/dp/B0BZMKYXHG", "quote_source": "Amazon exact product page observed 24 October 2026" }, { "id": 327, "brand": "BioTechUSA", "range_name": "Zero Bar", "flavour": "Chocolate Marzipan", "weight_g": 50, "protein_g": 20, "kcal": 190, "pack_price_gbp": 35.61, "bars_in_pack": 20, "currency": "GBP", "offer_checked_at": "2026-10-25T06:17:00.000Z", "cost_per_bar_gbp": "1.7805", "cost_per_20g_protein_gbp": "1.7805", "product_url": "https://whichbar.co.uk/bars/biotechusa-zero-bar-chocolate-marzipan", "nutrition_source": "https://shop.biotechusa.com/products/zero-bar-protein?variant=29472155172934", "retailer_url": "https://www.amazon.co.uk/dp/B0757VQM7J", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 428, "brand": "Grenade", "range_name": "Protein Bar", "flavour": "White Chocolate Salted Peanut", "weight_g": 60, "protein_g": 20, "kcal": 242, "pack_price_gbp": 22, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-26T08:52:05.625113+00:00", "cost_per_bar_gbp": "1.833333333333333333333333333", "cost_per_20g_protein_gbp": "1.833333333333333333333333333", "product_url": "https://whichbar.co.uk/bars/grenade-protein-bar-white-chocolate-salted-peanut", "nutrition_source": "https://www.grenade.com/products/protein-bar-white-chocolate-salted-peanut", "retailer_url": "https://www.grenade.com/products/protein-bar-white-chocolate-salted-peanut", "quote_source": "Grenade exact product page, standard one-time box price excluding delivery. Published product-widget rating and visible review count." }, { "id": 276, "brand": "Powerbar", "range_name": "Protein+ Low in Sugars", "flavour": "Vanilla", "weight_g": 35, "protein_g": 10, "kcal": 112, "pack_price_gbp": 15.02, "bars_in_pack": 16, "currency": "GBP", "offer_checked_at": "2026-10-25T01:17:00.000Z", "cost_per_bar_gbp": "0.93875", "cost_per_20g_protein_gbp": "1.87750", "product_url": "https://whichbar.co.uk/bars/powerbar-protein-low-in-sugars-vanilla", "nutrition_source": "https://www.powerbar.com/cdn/shop/files/11350b2e3cb04cc5b1a48d196a7ab8d5_24158174-bb24-4367-8586-3d5a3afb47be.jpg?width=2000", "retailer_url": "https://www.amazon.co.uk/dp/B09X75RYFP", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 432, "brand": "Optimum Nutrition", "range_name": "Protein Bar", "flavour": "Marshmallow Crunch", "weight_g": 65, "protein_g": 20, "kcal": 217, "pack_price_gbp": 19.03, "bars_in_pack": 10, "currency": "GBP", "offer_checked_at": "2026-10-25T12:14:00.000Z", "cost_per_bar_gbp": "1.903", "cost_per_20g_protein_gbp": "1.903", "product_url": "https://whichbar.co.uk/bars/optimum-nutrition-protein-bar-marshmallow-crunch", "nutrition_source": "https://www.optimumnutrition.com/products/marshmallow-crunch-protein-bar-20g", "retailer_url": "https://www.amazon.co.uk/dp/B0C541XRG8", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 308, "brand": "Misfits", "range_name": "Plant-Based Protein Bar", "flavour": "Caramel Popcorn", "weight_g": 50, "protein_g": 16, "kcal": 181, "pack_price_gbp": 23.79, "bars_in_pack": 15, "currency": "GBP", "offer_checked_at": "2026-10-25T04:17:00.000Z", "cost_per_bar_gbp": "1.586", "cost_per_20g_protein_gbp": "1.9825", "product_url": "https://whichbar.co.uk/bars/misfits-plant-based-protein-bar-caramel-popcorn", "nutrition_source": "https://uk.eatmisfits.com/cdn/shop/files/popcorn_table.png?v=1778703186&width=1200", "retailer_url": "https://www.amazon.co.uk/dp/B0F1FNBD7N", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 330, "brand": "Protein Works", "range_name": "The Big Little Bar", "flavour": "Chocolate Hazelnut Honcho", "weight_g": 33, "protein_g": 10, "kcal": 104, "pack_price_gbp": 19.99, "bars_in_pack": 20, "currency": "GBP", "offer_checked_at": "2026-10-25T06:17:00.000Z", "cost_per_bar_gbp": "0.9995", "cost_per_20g_protein_gbp": "1.9990", "product_url": "https://whichbar.co.uk/bars/protein-works-the-big-little-bar-chocolate-hazelnut-honcho", "nutrition_source": "https://www.theproteinworks.com/the-big-little-bar-20-pack", "retailer_url": "https://www.amazon.co.uk/dp/B0GR9JXG38", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 333, "brand": "Protein Works", "range_name": "The Big Little Bar", "flavour": "Chocolate Brownie Boogie", "weight_g": 33, "protein_g": 10, "kcal": 104, "pack_price_gbp": 19.99, "bars_in_pack": 20, "currency": "GBP", "offer_checked_at": "2026-10-25T06:17:00.000Z", "cost_per_bar_gbp": "0.9995", "cost_per_20g_protein_gbp": "1.9990", "product_url": "https://whichbar.co.uk/bars/protein-works-the-big-little-bar-chocolate-brownie-boogie", "nutrition_source": "https://www.theproteinworks.com/the-big-little-bar-20-pack", "retailer_url": "https://www.amazon.co.uk/dp/B0GR9FS2NK", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 281, "brand": "Powerbar", "range_name": "30% Protein Plus", "flavour": "Chocolate", "weight_g": 55, "protein_g": 17, "kcal": 190, "pack_price_gbp": 26.06, "bars_in_pack": 15, "currency": "GBP", "offer_checked_at": "2026-10-25T01:17:00.000Z", "cost_per_bar_gbp": "1.737333333333333333333333333", "cost_per_20g_protein_gbp": "2.043921568627450980392156862", "product_url": "https://whichbar.co.uk/bars/powerbar-30-protein-plus-chocolate", "nutrition_source": "https://www.powerbar.com/cdn/shop/files/f10a0c3ee98f412a8b5e66cb68e57c16_a33d44b1-4ed5-4311-a040-59a1eef12775.jpg?width=2000", "retailer_url": "https://www.amazon.co.uk/dp/B000H2V7X0", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 45, "brand": "Pulsin", "range_name": "Protein Bar", "flavour": "Maple & Peanut", "weight_g": 50, "protein_g": 14, "kcal": 241, "pack_price_gbp": 25.89, "bars_in_pack": 18, "currency": "GBP", "offer_checked_at": "2026-10-25T15:17:00.000Z", "cost_per_bar_gbp": "1.438333333333333333333333333", "cost_per_20g_protein_gbp": "2.054761904761904761904761904", "product_url": "https://whichbar.co.uk/bars/pulsin-maple-peanut", "nutrition_source": "https://www.pulsin.co.uk/products/pulsin-maple-peanut-protein-bar-18x50g", "retailer_url": "https://www.amazon.co.uk/dp/B0081594A8", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 26, "brand": "YuBi", "range_name": "Protein Bar", "flavour": "Caramel", "weight_g": 35, "protein_g": 10, "kcal": 99, "pack_price_gbp": 12.99, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-25T13:38:00.000Z", "cost_per_bar_gbp": "1.0825", "cost_per_20g_protein_gbp": "2.1650", "product_url": "https://whichbar.co.uk/bars/yubi-caramel", "nutrition_source": "https://www.yubibar.com/products/caramel", "retailer_url": "https://www.amazon.co.uk/dp/B0BLHCS4Y8", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 28, "brand": "YuBi", "range_name": "Protein Bar", "flavour": "Speculoos", "weight_g": 35, "protein_g": 10, "kcal": 99, "pack_price_gbp": 12.99, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-25T13:38:00.000Z", "cost_per_bar_gbp": "1.0825", "cost_per_20g_protein_gbp": "2.1650", "product_url": "https://whichbar.co.uk/bars/yubi-speculoos", "nutrition_source": "https://www.yubibar.com/products/speculoos", "retailer_url": "https://www.amazon.co.uk/dp/B0BLHFJ7Y1", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 32, "brand": "YuBi", "range_name": "Protein Bar", "flavour": "S'mores", "weight_g": 35, "protein_g": 10, "kcal": 99, "pack_price_gbp": 12.99, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-25T13:48:00.000Z", "cost_per_bar_gbp": "1.0825", "cost_per_20g_protein_gbp": "2.1650", "product_url": "https://whichbar.co.uk/bars/yubi-s-mores", "nutrition_source": "https://www.yubibar.com/products/smores", "retailer_url": "https://www.amazon.co.uk/dp/B0C9JVLWG4", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 33, "brand": "YuBi", "range_name": "Protein Bar", "flavour": "Hazelnut", "weight_g": 35, "protein_g": 10, "kcal": 99, "pack_price_gbp": 12.99, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-25T14:17:00.000Z", "cost_per_bar_gbp": "1.0825", "cost_per_20g_protein_gbp": "2.1650", "product_url": "https://whichbar.co.uk/bars/yubi-hazelnut", "nutrition_source": "https://www.yubibar.com/products/hazelnut", "retailer_url": "https://www.amazon.co.uk/dp/B0CBN1CRLT", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 35, "brand": "YuBi", "range_name": "Protein Bar", "flavour": "Raspberry Ripple", "weight_g": 35, "protein_g": 10, "kcal": 99, "pack_price_gbp": 12.99, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-25T13:33:00.000Z", "cost_per_bar_gbp": "1.0825", "cost_per_20g_protein_gbp": "2.1650", "product_url": "https://whichbar.co.uk/bars/yubi-raspberry-ripple", "nutrition_source": "https://www.yubibar.com/products/raspberry-ripple", "retailer_url": "https://www.amazon.co.uk/dp/B0CBN49QY9", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 36, "brand": "YuBi", "range_name": "Protein Bar", "flavour": "Fudge Brownie", "weight_g": 35, "protein_g": 10, "kcal": 99, "pack_price_gbp": 12.99, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-25T13:38:00.000Z", "cost_per_bar_gbp": "1.0825", "cost_per_20g_protein_gbp": "2.1650", "product_url": "https://whichbar.co.uk/bars/yubi-fudge-brownie", "nutrition_source": "https://www.yubibar.com/products/fudge-brownie", "retailer_url": "https://www.amazon.co.uk/dp/B0CHVX76CR", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 37, "brand": "YuBi", "range_name": "Protein Bar", "flavour": "Honeycomb", "weight_g": 35, "protein_g": 10, "kcal": 99, "pack_price_gbp": 12.99, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-25T13:38:00.000Z", "cost_per_bar_gbp": "1.0825", "cost_per_20g_protein_gbp": "2.1650", "product_url": "https://whichbar.co.uk/bars/yubi-honeycomb", "nutrition_source": "https://www.yubibar.com/products/honeycomb", "retailer_url": "https://www.amazon.co.uk/dp/B0D8Q2QTDL", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 27, "brand": "YuBi", "range_name": "Protein Bar", "flavour": "Peanut", "weight_g": 35, "protein_g": 10, "kcal": 99, "pack_price_gbp": 13.05, "bars_in_pack": 12, "currency": "GBP", "offer_checked_at": "2026-10-25T13:38:00.000Z", "cost_per_bar_gbp": "1.0875", "cost_per_20g_protein_gbp": "2.1750", "product_url": "https://whichbar.co.uk/bars/yubi-peanut", "nutrition_source": "https://www.yubibar.com/products/peanut", "retailer_url": "https://www.amazon.co.uk/dp/B0BLHFKXLF", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 335, "brand": "Protein Works", "range_name": "Ridiculous Vegan Protein Bar", "flavour": "Triple Chocolate Brownie", "weight_g": 47.5, "protein_g": 17, "kcal": 181, "pack_price_gbp": 16.99, "bars_in_pack": 9, "currency": "GBP", "offer_checked_at": "2026-10-24T22:59:00.000Z", "cost_per_bar_gbp": "1.887777777777777777777777778", "cost_per_20g_protein_gbp": "2.220915032679738562091503268", "product_url": "https://whichbar.co.uk/bars/protein-works-ridiculous-vegan-protein-bar-triple-chocolate-brownie", "nutrition_source": "https://www.theproteinworks.com/ridiculous-vegan-protein-bar", "retailer_url": "https://www.amazon.co.uk/dp/B08TBGMQ4C", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 47, "brand": "Pulsin", "range_name": "Protein Bar", "flavour": "Caramel Choc & Peanut", "weight_g": 50, "protein_g": 13, "kcal": 230, "pack_price_gbp": 25.99, "bars_in_pack": 18, "currency": "GBP", "offer_checked_at": "2026-10-25T15:17:00.000Z", "cost_per_bar_gbp": "1.443888888888888888888888889", "cost_per_20g_protein_gbp": "2.221367521367521367521367522", "product_url": "https://whichbar.co.uk/bars/pulsin-caramel-choc-peanut", "nutrition_source": "https://www.pulsin.co.uk/products/pulsin-caramel-choc-peanut-protein-bar-18x50g", "retailer_url": "https://www.amazon.co.uk/dp/B086FS5JBP", "quote_source": "Keepa Amazon UK Buy Box including delivery" }, { "id": 336, "brand": "Protein Works", "range_name": "Ridiculous Vegan Protein Bar", "flavour": "Wild Chocolate Peanut", "weight_g": 47.5, "protein_g": 16, "kcal": 184, "pack_price_gbp": 16.27, "bars_in_pack": 9, "currency": "GBP", "offer_checked_at": "2026-10-25T07:05:00.000Z", "cost_per_bar_gbp": "1.807777777777777777777777778", 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