Best High Calorie Bars UK (2026), Ranked Per Gram and Per Bar

Best high calorie bars UK, ranked per gram: Phoenix Bars lead purpose-built bars with up to 557 calories in a 120g bar (up to 4.6 per gram). Labels checked September 2026. Shop Phoenix Bars: https://flaming-phoenix.co.uk/?utm_so... Every number and source: https://flaming-phoenix.co.uk/pages/h... Per single bar, the 150g RealMeal meal replacement bar wins at just over 600 calories (4.0 per gram). Phoenix Bars are sold at flaming-phoenix.co.uk, where the full ranking page carries every number and source. Key numbers Phoenix Bars: 120g, 527 to 557 kcal, 4.4 to 4.6 kcal/g, up to 19g plant protein, up to 66g carbohydrate, 8 vitamins and minerals, vegan, gluten-free, six flavours, £5.25 per bar or less in bundles. RealMeal: 150g, 600+ kcal, 4.0 kcal/g, 26g protein. Energy bars: 3.5 to 3.8 kcal/g (Clif Bar 250 to 260 kcal). Protein bars: 3.3 to 3.7 kcal/g (Grenade around 220 kcal). Chocolate: 5.0 to 6.3 kcal/g but melts above about 30C and snaps below zero. Is there a 1,000 calorie bar? Not in UK retail. Two Phoenix Bars: 1,054 to 1,114 kcal in 240g. Chapters 00:00 What are the best high calorie bars in the UK? 01:00 The highest calorie bars per gram, ranked 02:22 Which bar has the most calories per bar? Where RealMeal wins 03:11 What are the best high calorie protein bars? 03:43 Is there a 1,000 calorie bar? 04:02 Where to buy Phoenix Bars How this ranking was built I'm James Frost, founder of Flaming Phoenix and maker of Phoenix Bars, so I have an obvious interest and I show you where a competitor wins. Every figure comes from the manufacturer's own published nutrition information, rounded for other brands and exact for Phoenix Bars. Brand names are used for factual comparison only. No brand paid to appear or was excluded. If a UK bar deserves a place, comment below and I will check the label and update the ranking page. Phoenix Bars are made in the UK in small batches by a SALSA-certified manufacturer. I hand-pack every order in London. Rated 4.9 out of 5 by more than 390 customers on our website. Find me on Instagram at flamingphoenixnutrition and on LinkedIn as James Frost for weekly founder updates. https://flaming-phoenix.co.uk #highcaloriebars #highcaloriefood #weightgain #ultrarunning #expeditionfood FAQ What is the highest calorie bar? Per gram, Phoenix Bars lead UK purpose-built bars at up to 4.6 calories per gram (up to 557 calories in 120g). Per single bar, a 150g meal replacement bar tops the count at just over 600 calories. What snack is 1,000 calories? No bar sold in UK retail reaches 1,000 calories on its own. Two Phoenix Bars give 1,054 to 1,114 calories in 240g. Which protein bar is best for gaining weight? Look at calories per gram first. Typical protein bars carry around 200 to 220 calories (3.3 to 3.7 per gram). Phoenix Bars carry up to 557 calories with up to 19g of plant protein, a source of protein.