Food & drink

Mars Duo 78.8 g two-bar wrapper

Name: Mars Duo 78.8 g
Brand: Mars

The British and Irish two-bar Mars Duo, 2 x 39.4 g of caramel and nougat in milk chocolate, made in the United Kingdom by Mars Wrigley Confectionery UK.

Size & format

+15 more · All 18 versions in 26 countries

Compare sizes Explore the evidence

Where to buy

Other stores

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Manufacturer specification on Erudus (GB IE)^[4]

United Kingdom, Ireland · English · supported

Evidence reviewed
2026-09-25

Context, dates & evidence notes · Other observations

Evidence observed: 2024-11-15
Net content: 78.8 g
Pack: two-bar wrapper
Pieces: 2

Erudus record 11011, version 2.0, changed and reviewed 2024-11-15, supplied by the manufacturer; manufacturer product code 453945; inner component weight 0.08 kg, 32 units per outer case, shelf life 364 days from production; the statement matches the wrapper word for word.

Nutrition

Nutrition panel

Per 100 g

as sold^[4]

442 kcalEnergy

61 gSugars

Per 100 g · per 100 g · as sold
Nutrient	Amount per 100 g
Energy	1858 kJ (22% DV) / 442 kcal (22% DV)
Fat	16 g (23% DV)
of which saturates	7.5 g (38% DV)
Carbohydrate	70 g (27% DV)
of which sugars	61 g (68% DV)
Protein	4.5 g (9% DV)
Salt	0.68 g (11% DV)

Notes on this panel

The sheet's traffic-light panel rounds salt to 0.7 g; its table prints 0.68 g.

Ingredients

As printed, EnglishSugar, Glucose Syrup, Skimmed MILK Powder, Cocoa Butter, Cocoa Mass, Sunflower Oil, Whey Permeate (MILK), Palm Fat, MILK Fat, Fat-Reduced Cocoa Powder, BARLEY Malt Extract, Salt, Emulsifier (SOYA Lecithin), EGG White Powder, Milk Chocolate contains Milk Solids 14% minimum, Milk Chocolate contains Vegetable Fats in addition to Cocoa Butter

Allergen declarations

may contain: nuts^[4] · May contain almonds, Brazil nuts, cashews, hazelnuts, macadamia, pecans, pistachios and walnuts, each listed separately.
may contain: peanuts^[4]

Other observations & source differences (3)

Different sources or national labels can coexist. Differences alone do not establish a change to the product.

GB and IE wrapper, photos 2025 supported · Compare evidence
Read from the Open Food Facts ingredients (imgid 9), nutrition (imgid 7) and front (imgid 8) photos uploaded 2025-10-30; the back photographed on 2025-09-13 (imgid 4) prints the same statement above the GB and IE consumer blocks, and the nutrition table photographed on 2025-03-27 (imgid 3) prints the same figures.
Manufacturer specification on Erudus (GB IE) supported · selected
Erudus record 11011, version 2.0, changed and reviewed 2024-11-15, supplied by the manufacturer; manufacturer product code 453945; inner component weight 0.08 kg, 32 units per outer case, shelf life 364 days from production; the statement matches the wrapper word for word.
Evidence awaiting context review unconfirmed · Compare evidence

Product facts

Explore the family ↗

Barcode: 5000159551724 check digit OK
Brand: Mars
Ultimately owned by: Mars, Incorporated (🇺🇸 United States)
Family: Mars bar
Category: Food/Beverage, Confectionery/Sugar Sweetening Products, Confectionery Products, Chocolate and Chocolate/Sugar Candy Combinations - Confectionery
Net content: 78.8 g
Pack: two-bar wrapper
Sold in: 🇬🇧 United Kingdom^[1], 🇮🇪 Ireland^[1]
Pieces: 2
Last observed on sale: 2026-09-25
Last sale evidence: In stock at GBP 2.15 at The Grocery Store, Wembley, London, on Devo.
Made in: 🇬🇧 United Kingdom
GS1 prefix: 500 · United Kingdom

Who owns it

Mars ↗

Made in the United Kingdom · owned from the United States

Ultimately owned by: Mars, Incorporated · United States
Chain: Mars → Mars, Incorporated
Made in: United Kingdom

Sources for each tie

Mars → Mars, IncorporatedWikipedia ↗

The ownership drawing

No company above it
🇺🇸 Mars, Incorporated
ownssince 1932

Mars

What the sources say about these ties

Mars, Incorporated owns: Wikipedia names Mars Inc. as the producer of the Mars bar since 1932.

Built from the ownership rows on the brand and company pages, each cited where it is recorded. Made in is the country of production on this product's record; the GS1 prefix of a barcode names the issuing organisation, not where the product was made.

About this product

Mars Duo 78.8 g is the two-bar pack of the Mars bar for Britain and Ireland: two 39.4 g bars of milk chocolate (40%) with soft nougat (32%) and a caramel centre (27%) in one wrapper, the recipe Forrest Mars Sr. first made in Slough in 1932.^[2]^[3] The manufacturer's specification, titled for the GB and IE markets, gives Mars in Slough as the maker and the United Kingdom as the country of origin, packed 32 to a case.^[4] The wrapper prints a British consumer block for Mars Wrigley Confectionery UK and an Irish one for Mars Foods Ireland, and each bar carries 174 kcal.^[1]^[2] It is labelled suitable for vegetarians.^[2]

The Duo replaced the single king-size Mars bar; when Wikipedia described the range as of 2008 it weighed 85 g.^[3] A London convenience store sold it at GBP 2.15 in September 2026, and the Irish discount chain MrPRICE listed it online at EUR 1.49.^[5]^[6]

Where it's sold

Mars Duo at The Grocery Store, Wembley, London ^[5] United Kingdom GBP 2.15 · new 2026-09-25 · sourced The Grocery Store, Wembley, London HA9: Mars Duo, 78.8 g, in stock; the listing URL carries this barcode.
Mars Duo Chocolate Bar 2 x 39.4g, MrPRICE.online ^[6] Ireland EUR 1.49 · new 2026-09-25 · sourced MrPRICE, the Irish discount chain's online shop, lists "Mars Duo Chocolate Bar 2 x 39.4g" with this barcode as its product barcode and SKU, at EUR 1.49, shown as sold out online.
Amazon.co.uk ^[8] United Kingdom new 2026-09-25 · derived Amazon.co.uk ASIN B01ET7KD1K "Mars Duo 78.8g", 78.8 g pack of 1, under Grocery > Food Cupboard > Snacks & Sweets > Chocolate Candy > Blocks & Bars, manufacturer Mars Wrigley Confectionery UK; name, brand and net content match but the page prints no barcode, and the earlier Duo code 5000159470490 is an equal match. Shown as currently unavailable, with no price.
Erudus specification 11011 information^[4] United Kingdom 2024-11-15 · sourced Manufacturer specification titled "MARS Duo 32x2x39.4g GB IE", inner component GTIN 5000159551724 in an outer case of 32 (case GTIN 5000159551717), country of origin United Kingdom. · made in United Kingdom
From the packaging
GB-marked consumer block with the UK freephone 0800 952 0077 and Freepost Mars Wrigley Confectionery UK Ltd.^[1] United Kingdom 2025-09-13 · printed
IE-marked consumer block for Mars Foods Ireland Ltd, PO Box 3856, Dublin 4, with the Irish number 1890 812 315.^[1] Ireland 2025-09-13 · printed

A listing is evidence that this barcode is sold there, on that date; a price is what that listing showed, not a recommended price. Store links may be affiliate links (how this works).

18 versions of Mars bar

Sold in 26 countries, 3 of 18 sold in one country only

United Kingdom 10 packs · 8 lines · includes this pack

Version	Size	Pack	Also sold in	Barcode
Mars 3 bars	118.2 g	price-marked multipack flow wrap	IE	`5000159564038`
Mars 4 bars	157.6 g	multipack flow wrap	IE, US	`5000159484527`
Mars 4 bars	157.6 g	multipack flow wrap	IE	`5000159551823`
Mars 4 x 51 g	204 g	flow-wrapped multipack	IE	`5000159481090`
Mars 51 g single bar	51 g	flow wrap	IE	`5000159470476`
Mars 51 g single bar, 75p price-mark	51 g	price-marked flow wrap (75p)		`5000159565004`
Mars 51 g single bar, later code	51 g	flow wrap	IE, ES	`5000159551694`
Mars Duo	78.8 g	two-bar wrapper	FR	`5000159470490`
Mars Duo	78.8 g this page	two-bar wrapper	IE	`5000159551724`
Mars snack size, 9 bars	304.2 g	multipack flow wrap	IE	`5000159521406`

Ireland 8 packs · 7 lines · includes this pack

Version	Size	Pack	Also sold in	Barcode
Mars 3 bars	118.2 g	price-marked multipack flow wrap	GB	`5000159564038`
Mars 4 bars	157.6 g	multipack flow wrap	GB, US	`5000159484527`
Mars 4 bars	157.6 g	multipack flow wrap	GB	`5000159551823`
Mars 4 x 51 g	204 g	flow-wrapped multipack	GB	`5000159481090`
Mars 51 g single bar	51 g	flow wrap	GB	`5000159470476`
Mars 51 g single bar, later code	51 g	flow wrap	GB, ES	`5000159551694`
Mars Duo this page	78.8 g	two-bar wrapper	GB	`5000159551724`
Mars snack size, 9 bars	304.2 g	multipack flow wrap	GB	`5000159521406`

France 4 packs · 3 lines

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, multilingual pack (Veghel)	51 g	flow wrap	BE, NL, PL, FI, IT, MT	`5000159407236`
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	DE, AT, CH, CZ, SK, PL, TR, NG, KE	`5900951311321`
Mars Duo	78.8 g	two-bar wrapper	GB	`5000159470490`
Mars Duo	78.8 g	two-bar wrapper		`5000159519328`

Switzerland 3 packs · 3 lines

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g	70 g	flow wrap	UA	`5000159408301`
Mars 2 x 35 g, Polish-prefix pack	70 g	flow wrap	DE, AT, SE, NO, DK, FI, MT	`5900951311215`
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, DE, AT, CZ, SK, PL, TR, NG, KE	`5900951311321`

Austria 2 packs · 2 lines

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g, Polish-prefix pack	70 g	flow wrap	DE, CH, SE, NO, DK, FI, MT	`5900951311215`
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, DE, CH, CZ, SK, PL, TR, NG, KE	`5900951311321`

Finland 2 packs · 2 lines

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g, Polish-prefix pack	70 g	flow wrap	DE, AT, CH, SE, NO, DK, MT	`5900951311215`
Mars 51 g single bar, multilingual pack (Veghel)	51 g	flow wrap	FR, BE, NL, PL, IT, MT	`5000159407236`

Germany 2 packs · 2 lines

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g, Polish-prefix pack	70 g	flow wrap	AT, CH, SE, NO, DK, FI, MT	`5900951311215`
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, AT, CH, CZ, SK, PL, TR, NG, KE	`5900951311321`

Malta 2 packs · 2 lines

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g, Polish-prefix pack	70 g	flow wrap	DE, AT, CH, SE, NO, DK, FI	`5900951311215`
Mars 51 g single bar, multilingual pack (Veghel)	51 g	flow wrap	FR, BE, NL, PL, FI, IT	`5000159407236`

Poland 2 packs · 2 lines

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, multilingual pack (Veghel)	51 g	flow wrap	FR, BE, NL, FI, IT, MT	`5000159407236`
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, DE, AT, CH, CZ, SK, TR, NG, KE	`5900951311321`

Australia 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 47 g single bar	47 g	paper-based wrapper	NZ	`9300682059015`

Belgium 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, multilingual pack (Veghel)	51 g	flow wrap	FR, NL, PL, FI, IT, MT	`5000159407236`

Canada 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 2 Pack 85 g	85 g	wrapper		`058496328757`

Czechia 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, DE, AT, CH, SK, PL, TR, NG, KE	`5900951311321`

Denmark 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g, Polish-prefix pack	70 g	flow wrap	DE, AT, CH, SE, NO, FI, MT	`5900951311215`

Italy 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, multilingual pack (Veghel)	51 g	flow wrap	FR, BE, NL, PL, FI, MT	`5000159407236`

Kenya 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, DE, AT, CH, CZ, SK, PL, TR, NG	`5900951311321`

Netherlands 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, multilingual pack (Veghel)	51 g	flow wrap	FR, BE, PL, FI, IT, MT	`5000159407236`

New Zealand 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 47 g single bar	47 g	paper-based wrapper	AU	`9300682059015`

Nigeria 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, DE, AT, CH, CZ, SK, PL, TR, KE	`5900951311321`

Norway 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g, Polish-prefix pack	70 g	flow wrap	DE, AT, CH, SE, DK, FI, MT	`5900951311215`

Slovakia 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, DE, AT, CH, CZ, PL, TR, NG, KE	`5900951311321`

Spain 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, later code	51 g	flow wrap	GB, IE	`5000159551694`

Sweden 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g, Polish-prefix pack	70 g	flow wrap	DE, AT, CH, NO, DK, FI, MT	`5900951311215`

Türkiye 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 51 g single bar, Polish-prefix pack	51 g	flow wrap	FR, DE, AT, CH, CZ, SK, PL, NG, KE	`5900951311321`

Ukraine 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 2 x 35 g	70 g	flow wrap	CH	`5000159408301`

United States 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 4 bars	157.6 g	multipack flow wrap	GB, IE	`5000159484527`

Country not recorded 1 pack · 1 line

Version	Size	Pack	Also sold in	Barcode
Mars 2 Pack King Size	–	wrapper		`5000159372251`

Reviews

No ratings yet.

Sources & research

Evidence reviewed 2026-09-25

Open Food Facts

Back of the Mars Duo wrapper with the GB and IE consumer blocks

pack · Accessed 2026-09-25

Source & attribution [1] ↗

Wikipedia

Mars bar

publication · Accessed 2026-09-25

Source & attribution [3] ↗

Erudus (via Templeman)

Erudus specification 11011: MARS Duo 32x2x39.4g GB IE Everest

registry · Accessed 2026-09-25

Source & attribution [4] ↗

Coverage & research gaps (8)

Coverage measures the evidence recorded here. It does not rate the product.

Identity: 3 / 3 · Name, brand and classification recorded
Context: 2 / 3 · Evidence groups assigned to a researched label, edition or analysis
Label photographs: 0 / 2 · Researched contexts with an assigned photograph
GB and IE wrapper, photos 2025: nutrient evidence: 20 / 20 · Recorded nutrient rows linked to a source; not the number of nutrients that ought to exist
Manufacturer specification on Erudus (GB IE): nutrient evidence: 8 / 8 · Recorded nutrient rows linked to a source; not the number of nutrients that ought to exist

nutrition · disputed: The typed Open Food Facts values for this barcode (722.7 kJ, 532 kcal, 6.3 g fat, 27 g carbohydrate, 24 g sugars, 1.8 g protein, 0.67 g salt per 100 g) mix the per-bar column with other figures and contradict the photographed table, so they are not used.
markets · unknown: Searched amazon.ie on 2026-09-25 for "Mars Duo 78.8g", "Mars" and 5000159551724 (with a Dublin delivery address): no single Duo pack was found; B01ET7KD1K answers 404 there, and the only Duo listing, B0074FP87E, is a box of 32 bars at EUR 62.99 from London Food Hall Ireland, printing no barcode.
markets · unknown: Searched amazon.co.uk on 2026-09-25 for "Mars Duo 78.8g", "Mars" and 5000159551724 (the barcode search returned no results). Besides the unavailable single B01ET7KD1K, the Duo listings are boxes of 32 (B0074FP87E at GBP 31.99 from Kidzkandy) and B00WUEQ69I "Mars Chocolate Duo Chocolate Bar, 79 g", unavailable and printing no barcode.
markets · unknown: The US import shop Brits R U.S. lists "Mars Bar Duo" with this barcode as its SKU, shown out of stock on 2026-09-25; no US storefront was searched, so US is not in country_of_sale.
evidence · stale: Evidence was observed over a year ago; check for newer labels. Historical evidence remains valid.
schema · schema_gap: Review and assign legacy facts to coherent observations.
ingredients · not_researched: Ingredient statement or sourced exemption not recorded.
nutrition · not_researched: Nutrition declaration or exemption not recorded.

All references & source details

References

↑ Back of the Mars Duo wrapper with the GB and IE consumer blocks Open Food Facts. pack. Published 2025-09-13. Accessed 2026-09-25. Record: 5000159551724. imgid 4, 720 x 1280 px. CC BY-SA 3.0. Open Food Facts contributors. Upstream: off.
↑ Ingredient statement, nutrition table and front of the Mars Duo wrapper Open Food Facts. pack. Published 2025-10-30. Accessed 2026-09-25. Record: 5000159551724. imgids 9 (ingredients), 7 (nutrition) and 8 (front), uploaded 2025-10-30. CC BY-SA 3.0. Open Food Facts contributors. Upstream: off.
↑ Mars bar Wikipedia. publication. Accessed 2026-09-25. CC BY-SA. Wikipedia contributors.
↑ Erudus specification 11011: MARS Duo 32x2x39.4g GB IE Everest Erudus (via Templeman). registry. Published 2024-11-15. Accessed 2026-09-25. Record: 1f7afca444004f739624229ba7b307c4. inner component GTIN 5000159551724, outer case GTIN 5000159551717.
↑ Mars Duo at The Grocery Store, Wembley, London Devo. retailer. Accessed 2026-09-25. Record: 5000159551724. GBP 2.15, in stock.
↑ Mars Duo Chocolate Bar 2 x 39.4g, MrPRICE.online MrPRICE. retailer. Accessed 2026-09-25. Record: 5000159551724. EUR 1.49, sold out online.
↑ GDSN trading partners: GS1 GDSN member companies and their GLNs GS1. registry. Accessed 2026-09-25. Record: 5000159000000.
↑ Mars Duo 78.8g : Amazon.co.uk: Grocery Amazon.co.uk. retailer. Accessed 2026-09-25. Record: B01ET7KD1K. model number 105896211, currently unavailable.

Further sources

Additional sources recorded for this entry, including other observations and related pages.

Open Food Facts: Mars Duo (5000159551724) Open Food Facts. catalogue. Accessed 2026-09-25. Record: 5000159551724. ODbL. Open Food Facts contributors.

Barcode & identifiers

GTIN-14: 05000159551724
EAN-13 / GTIN-13: 5000159551724

Read the complete structured record (JSON) ↗ · Barcode image ↗

Every detail has a history.

Explore the observations, changes and sources behind this record.

View product history ↗

Last edited 2026-09-25 View history Sign in to edit

Reuse freely with credit: text CC BY-SA 4.0, data ODbL. Cite this page as Source: Barcodepedia, https://barcodepedia.com/product/5000159551724/mars-duo-78-8-g (licence).