Few chocolate bars carry the weight of a legacy. The Mars bar does. Since Forrest Mars Sr. launched it from a small factory in Slough in 1932, this combination of soft nougat, smooth caramel, and milk chocolate has become one of the most recognised chocolate bars on the planet, the bar that built an entire confectionery empire. 

Mars Chocolate has stayed true to that original formula for over 90 years: the nougat centre whipped to a soft, light texture, the caramel layer sticky and rich, and the milk chocolate coating sealing it all into something that is both filling and completely moreish. Available in the classic 51g single bar, the generous Mars Duo 69g format, and the bulk Mars Chocolate 24 Pack suited to stocking up, there is a Mars bar format for every occasion and every appetite. 

Check out our full range of Confectionery alongside Mars Chocolate, or see which Confectionery products are leading Best Sellers right now.

Why You'll Love Mars

Three Layers, One Legendary Bar 

The Mars bar is not a single-ingredient chocolate. The nougat base is whipped to a light, airy texture, giving the bar its soft, yielding character. Above that sits a layer of smooth, caramel, sticky, rich, and slightly salty. The whole thing is sealed in milk chocolate. Three completely different textures and flavours, every single bite, in a bar that has not changed its formula since 1932 because it never needed to.

A Filling Like No Other

The combination of nougat and caramel makes a Mars bar genuinely satisfying in a way that a plain chocolate bar simply is not. The nougat provides substance, the caramel adds energy-dense sweetness, and the milk chocolate ties it together. It was marketed for decades as an energy bar for good reason; it keeps you going in a way that lighter alternatives cannot match.

The Caramel Layer Is the Standout 

Caramel is a common inclusion in chocolate bars, but the Mars caramel is distinctively gooey and generous; it is not a thin line but a proper thick layer that pulls and stretches when you bite in. That stretch is part of the Mars eating experience and is one of the defining reasons why someone who wants a Mars bar specifically will not accept a substitute.

24-Pack Format: Value Built-In 

Mars Chocolate Bars in the 24 × 51g pack are the practical format for anyone who eats Mars regularly or wants to stock up properly. Twenty-four bars in a case mean fewer trips and consistent availability. The Mars 24 x 51g format is one of the most purchased confectionery bulk formats in the UK for precisely this reason.

Mars Duo: When One Is Not Enough

The Mars Duo 69g takes the same nougat, caramel, and milk chocolate formula and delivers it in a larger two-section bar. Ideal for a longer break, a shared occasion, or simply when the standard 51g feels like it is going to leave you short. The Duo format is available in 24-bar cases and has become a consistent seller in its own right alongside the classic single bar.

A Bar for Every Time of Day 

The "A Mars a day helps you work, rest, and play" tagline was not invented for nothing. Mars Chocolate Bars cover the desk drawer mid-afternoon, the post-gym sugar hit, the long drive pick-up, and the film night treat with equal competence. It is one of the very few chocolate bars that crosses every occasion without feeling out of place in any of them.

Explore the Mars Chocolate Range

• Mars Bar 51g × 24  The original and most purchased Mars Chocolate format. Each 51g Mars 51g Chocolate Bar contains the full three-layer nougat, caramel, and milk chocolate combination. Available in cases of 24 bars, the Mars Chocolate 24 Pack is the standard stocking format for retail, office, and home supply. Price-marked pack versions are also available for retail display. At 51g, the bar is compact enough for a single-serve treat but substantial enough to be genuinely satisfying.
• Mars Duo 69g × 24  A larger, two-section Mars Chocolate bar at 69g, the same nougat, caramel, and milk chocolate recipe scaled up for a bigger portion. Available in 24-bar cases. The Duo format sits between the classic single bar and the multipack in terms of portion size, and suits those who find the standard bar a little short. An increasing number of buyers use the Duo as their default daily Mars format rather than the classic.
• Mars Caramel Multipack 3 × 40g  Three individual Mars bars in a single multipack pack at 118.2g total. Available in cases of 22 multipacks. A value format suited to households, office treat jars, and multiple-serving occasions. The multipack bars are lighter at 40g every three occasions rather than a single portion.
• Mars Wider Brand Range  The Mars Chocolate family extends beyond the signature bar to include several of the UK's most recognised confectionery lines. Snickers (peanut, caramel, and nougat, the Mars bar's closest relative with the addition of roasted peanuts) is available in both the 50g single and the Snickers Duo format. For anyone who enjoys the Snickers and wants to try the larger double-bar version, the Snickers Duo Bar is available. Browse the full Snickers collection for all Snickers formats. Twix (caramel and biscuit fingers), Milky Way (lighter nougat with no caramel), Bounty (coconut in milk or dark chocolate), and Maltesers (honeycomb malt balls) round out the broader Mars single-bar portfolio.

Mars Bar vs The Wider Range

Ingredients Information

The following ingredients apply to the Mars Bar 51g. Always check individual packaging for the full and current ingredients list, as formulations may change.

Sugar, Glucose Syrup, Skimmed Milk Powder, Cocoa Butter, Cocoa Mass, Sunflower Oil, Lactose, Whey Powder (from Milk), Milk Fat, Whey Permeate (from Milk), Emulsifier (Soya Lecithin), Salt, Egg White, Natural Vanilla Extract.

Milk Chocolate contains Milk Solids 20% minimum.

Always refer to the product packaging for the full and current ingredient declaration before consumption.

Allergy Advice and Nutritional Information

Allergy Information: Please Read Before Purchase

Contains: Milk, Egg, Soya

May contain: Peanuts, Tree Nuts, Wheat/Gluten

Always check individual product packaging for the full and current allergen declaration. Formulations and manufacturing environments may vary between batches.

Nutritional Information: Mars Bar 51g (per 100g and per bar):

Reference intake of an average adult: 8,400kJ / 2,000kcal

When To Enjoy

The Mid-Afternoon Energy Dip 

There is a reason the Mars bar was associated with energy and keeping going. The combination of nougat and caramel sustains blood sugar more effectively than a plain milk chocolate bar and makes the 3pm slump more manageable. One Mars bar at the desk is a well-established British tradition.

Post-Gym or Post-Workout 

Mars Chocolate Bars provide a fast source of carbohydrate energy post-exercise. The sugar content makes them a practical immediate recovery snack for those who prefer a treat over a protein bar after a training session.

Long Journeys and Late Nights 

The Mars bar is filling, portable, and does not require refrigeration. For long drives, overnight trips, or extended sessions where a full meal is not available, a Mars bar fills the gap in a way that lighter confectionery does not.

Stocking Up With the 24-Pack 

The Mars Chocolate 24 Pack format is the most practical buying option for anyone who eats Mars regularly. Twenty-four bars at 51g each cover several weeks of daily treats, eliminate the need for repeated individual purchases, and offer better value per bar than buying singles.

Frequently Asked Questions