MRE (Meal, Ready-to-Eat): what is inside, calories and buying in the UK

Written by James Frost, founder of Flaming Phoenix and the maker of Phoenix Bars. Updated 25 October 2026.

An MRE, short for Meal, Ready-to-Eat, is the US military's individual field ration: one sealed bag holding a complete meal of about 1,250 calories, with a main course, a side, crackers or bread with a spread, a snack or dessert, a drink powder, an accessory pack and a flameless ration heater. Everything except the drink can be eaten cold. The US Defense Logistics Agency gives MREs a shelf life of three years at 80°F (about 27°C), longer if kept cool, and in the UK a genuine single MRE sells for around £15 through surplus and prepper shops.

Why I wrote this guide. Phoenix Bars began as my university project to design a better emergency ration, so field rations from around the world are something I have studied for years. Flaming Phoenix has no connection to the US or UK military; this guide is an independent explainer for anyone thinking of buying MREs in the UK, for camping, hiking or an emergency supply.

What is an MRE?

The MRE is a self-contained ration designed to feed someone doing heavy physical work when no kitchen is available. Development began in the 1960s as a lighter replacement for canned rations, and the MRE replaced the canned Meal, Combat, Individual in 1981, becoming standard issue in 1986 with a menu of twelve main courses. Today there are 24 menus, packed in two cases of twelve.

A flameless ration heater was added to every meal bag in the early 1990s, so troops could heat the main course without a stove or a fire. Soldiers have nicknamed MREs many things over the years, including three lies for the price of one: it is not a meal, it is not ready and you cannot eat it. The menus have improved a great deal since then.

What is inside an MRE?

Menus vary, but a typical MRE bag contains:

• A main course, or entrée, in a sealed pouch, such as chilli, beef stew or a pasta dish.
• A side dish, such as rice, beans or fruit.
• Crackers or bread, with a spread such as peanut butter, cheese spread or jam.
• A snack or dessert, such as a cake, cookie, energy bar, nuts or sweets.
• A drink powder, such as a sports drink, cocoa or a fruit drink.
• An accessory pack: spoon, salt, pepper, sugar, coffee, creamer, chewing gum, matches, a wet napkin and tissues.
• A flameless ration heater.

With the exception of the drinks, which need clean water, every edible component is ready to eat cold, straight from the pack.

How many calories are in an MRE?

An MRE averages about 1,250 calories, according to the US Defense Logistics Agency, with roughly 13% of the calories from protein, 36% from fat and 51% from carbohydrate. Three a day gives about 3,750 calories, which is what the ration is designed for: soldiers training or working hard all day. MREs are intended to be eaten for no more than 21 days in a row, after which fresh rations are expected to take over.

For an adult sitting out a power cut, one or two a day is plenty alongside other food. Our 3-day emergency food supply list shows how to reach about 7,000 calories per adult from supermarket food.

How long do MREs last?

The Defense Logistics Agency gives MREs a shelf life of three years at 80°F (about 27°C) and notes that cold storage before distribution can extend it. Heat is the enemy: an MRE kept in a hot car boot or loft will lose quality much faster than one in a cool cupboard.

• Check the pack or inspection date on the bag or case before you buy.
• Avoid bags that are punctured, swollen or have lost their seal.
• Store them somewhere cool, dry and dark, and rotate them like any other emergency food.

How does the flameless ration heater work?

The heater is a thin pouch containing a powder that heats up when water is added. You add a little water to the fill line, slide the sealed main-course pouch in beside it, fold the top over and rest it at an angle while it heats, following the instructions printed on the heater. Use it outdoors or somewhere well ventilated, and keep it away from children and pets. MRE bags have carried a notice about restrictions on taking ration heaters on commercial flights, so check your airline's rules before flying with one.

MRE vs British Army 24-hour ration pack

• Format: an MRE is a single meal of about 1,250 calories; a British 24-hour ration pack is a whole day of food, around 4,000 calories, in one box.
• Heating: every MRE includes a flameless heater; the standard British pack assumes a mess tin of boiling water, which also makes the tea.
• Menus: 24 MRE menus, against 10 General Purpose British menus plus vegetarian, halal, kosher and Sikh/Hindu versions.
• Price in the UK: around £15 for a single imported MRE, against roughly £16 to £19 for a full British day, at the prices we saw in October 2026.

For a day outdoors in Britain, the British pack is usually the better value. MREs are popular for the experience, for trying different menus, and for the built-in heater. Our guide to British Army ration packs lists the British menus and what is in the box.

Can you buy MREs in the UK?

Yes. Genuine US MREs reach the UK through military surplus dealers, prepper shops and online marketplaces, usually as single meals or mixed cases of 12. Genuine issue bags are printed with a US notice that commercial resale is unlawful, so many UK sellers also stock civilian MREs, made with the same packaging technology and sold for the public, along with British-made ready-to-eat meal pouches.

Before you buy:

• Check the pack or inspection date, and ask the seller if it is not listed.
• Avoid opened, re-boxed or mixed bundles assembled from loose components unless you are happy with random contents.
• Check for allergens and dietary needs on each menu; some menus are vegetarian.
• Expect to pay more for genuine issue meals than for civilian versions.

Are MREs good for emergencies, camping and hiking?

For a home emergency supply, MREs work: no cooking, a built-in heater for a hot meal in a power cut, and a shelf life of around three years. The trade-offs are cost and bulk. A few make a good addition to a cupboard of supermarket food, which is cheaper for most of a home emergency kit.

For a grab bag, an MRE is bulky for one meal. Dense, no-cook food does the same job in less space; our emergency grab bag list shows a day of food in about 500g, and our guide to emergency rations compares long-life options.

For camping, an MRE is a fun, no-washing-up dinner, especially on a first night.

For multi-day hiking, MREs are heavy for what they give, because the main courses are wet food. Most long-distance walkers pair freeze-dried dinners with dense food they can eat on the move, such as high calorie bars.

Common questions about MREs

What does MRE stand for?

Meal, Ready-to-Eat. It is the US military's individual field ration, in use since 1981.

Can you eat an MRE cold?

Yes. Every edible part is ready to eat cold. The heater simply makes the main course more appetising, and the drink powders need water.

How many MREs should you eat a day?

Soldiers working hard eat up to three, about 3,750 calories. For an emergency at home, one or two alongside other food is usually enough.

Do MREs expire?

They have a shelf life of around three years at 27°C, longer when stored cool and shorter in heat. Quality fades over time, so check the date and rotate them.

Are MREs healthy?

They are designed to fuel hard physical work, so they are high in calories and salt. They are fine for a few days in an emergency or on a trip, and are not meant to be eaten for more than 21 days in a row.

What is the difference between an MRE and a ration pack?

An MRE is one meal in a bag; a British 24-hour ration pack is a whole day of food in a box. Both are field rations made to be eaten without a kitchen.

Where can I buy MREs in the UK?

Military surplus dealers, prepper shops and online marketplaces. Check the pack date, avoid opened bundles, and compare genuine issue with civilian versions.

Sources: US Defense Logistics Agency, MRE; Joint Forces News, US MRE field rations; US Air Force Reserve, things you did not know about MREs; UK retailer listings, checked October 2026.