How Many Calories Should You Eat a Day? (UK 2026)

It is one of the most searched fitness questions in the UK, and the honest answer is a slightly annoying one: it depends. There is no single magic number that suits everyone, because the calories your body needs depend on who you are and how you live. The good news is that you can get a solid working estimate in a couple of minutes, use it to make a plan, and then let real life fine-tune it. Here is how to find a sensible daily calorie figure for your goal, and why the number matters a lot less than what you do with it.

So, how many calories should you eat a day?

The figures you have probably seen on food packaging are the reference intakes. In the UK, these put the average adult woman at around 2,000 kcal a day and the average adult man at around 2,500. They come from public health guidance and are meant as a general reference for a typical adult, not a prescription for you personally.

It is worth being clear about what those numbers are. They are population averages across a lot of different people, and they assume a broadly average size and activity level. Two people who both eat 2,000 kcal a day can end up in very different places, because one might need 1,700 to hold their weight and the other 2,300. So treat 2,000 and 2,500 as a starting frame of reference, then work out something closer to your own situation.

Why your number is different from the one on the packet

How many calories you burn in a day, and therefore how many you need to hold your weight, comes down to a handful of things:

• Bodyweight and height. A larger body simply costs more energy to run and to move around, so bigger and taller people tend to need more.
• Age. Energy needs usually drift down a little as we get older, partly because we tend to carry less muscle and move a bit less.
• Sex. On average men carry more muscle and less body fat than women, which nudges their needs higher, though there is a lot of overlap between individuals.
• Muscle mass. Muscle is more metabolically active than fat, so more of it lifts the calories you burn at rest. This is one reason strength training is so useful.
• Activity. Both your workouts and your everyday movement count, from steps and stairs to fidgeting and a physical job. Two people with the same body can differ by several hundred kcal a day on movement alone.

This is why a generic figure can only take you so far. The number that actually matters to you is your maintenance, the amount that keeps your weight steady, and that is personal.

How to estimate your own maintenance calories

There is a simple two-step way to get a working estimate. First you work out your BMR, your basal metabolic rate, which is roughly the energy your body uses just to keep ticking over at rest. Then you multiply it by an activity factor to account for how much you move. The result is your total daily energy expenditure, often shortened to TDEE, which is a reasonable guess at your maintenance calories.

You can estimate BMR with a standard equation such as Mifflin-St Jeor, which uses your weight, height, age and sex. You do not need to do the sums by hand. A reputable online TDEE or BMR calculator will do it for you in seconds, and the NHS BMI calculator is a good, trustworthy starting point for the weight and height side of things. Once you have a BMR, the usual activity multipliers look like this:

• Sedentary (desk job, little exercise): BMR times about 1.2.
• Lightly active (light exercise one to three days a week): times about 1.375.
• Moderately active (training three to five days a week): times about 1.55.
• Very active (hard training six to seven days a week, or a physical job): times about 1.725.

To save you the maths, the table below gives some rough daily maintenance ranges by activity level. They are ballpark estimates for a typical adult, so read them as a signpost rather than a personal readout.

Rough estimates only, for a broadly average adult. Your real number depends on your size, muscle and daily movement, so use these as a starting point and let your own results refine them. For figures tailored to you, a registered dietitian or your GP can help.

How to adjust the number for your goal

Once you have a maintenance estimate, adjusting it for what you want is straightforward. Weight change is mostly about the balance between the energy you take in and the energy you use.

• To lose fat: eat a little below maintenance. A modest deficit of roughly 300 to 500 kcal a day is a sensible, sustainable range for most people, and tends to produce about 0.5 kg of weight loss a week. Slower is often better, because it is easier to stick to and easier on your training.
• To stay the same: eat around maintenance, and let small day-to-day swings average out over the week.
• To build muscle or gain weight: eat a small surplus, often in the region of 200 to 400 kcal a day, alongside proper strength training so the extra goes towards muscle rather than mostly fat.

A quick word of caution on going too hard. Very low intakes, the kind of crash targets you sometimes see online, are tough to maintain, can leave you short on nutrients, and often cost you muscle and energy for training. The NHS view of a safe, realistic rate of weight loss is around 0.5 to 1 kg a week, and there is rarely a good reason to be more aggressive than that. If you want a lower target than a modest deficit, or you have a history of disordered eating, please speak to a GP or a registered dietitian first.

If you want the full picture on why a gentle shortfall works, and how to set one up without white-knuckling it, our guide to what a calorie deficit actually is walks through it step by step.

Why the number is only a starting point

Here is the part most calculators skip: the figure you land on is an educated guess, not a fact about your body. Every equation and every activity multiplier carries a margin of error, and things like sleep, stress and how much you fidget all move the real number around. So the smart approach is to treat your estimate as a first draft and let the scales and the mirror do the editing.

In practice that means picking a number, eating roughly to it for two to four weeks, and watching the trend rather than any single day. If fat loss has stalled and you want it to continue, trim a little, perhaps 100 to 200 kcal, or add some movement. If you are losing faster than feels comfortable or your training is suffering, eat a bit more. Weigh yourself at a consistent time and average across the week, because water, food in transit and hormones can swing the scales by a kilo or two day to day for reasons that have nothing to do with fat.

Why food quality and consistency beat hitting an exact figure

It is easy to get so fixated on a calorie number that you miss the things that make the biggest difference. For most people, three habits matter more than nailing an exact total:

• Enough protein. Protein keeps you fuller, helps protect muscle while you lose fat, and takes a little more energy to digest. Building meals around a protein source is one of the simplest wins there is.
• Mostly whole foods. Vegetables, fruit, wholegrains, beans and minimally processed foods give you more nutrition and more fullness per calorie, so a sensible intake feels far less like a diet.
• Consistency over perfection. A plan you follow most days beats a perfect plan you abandon by Wednesday. One big meal out will not undo a good week, and it is what you do repeatedly that counts.

This is also where training earns its place. Regular exercise, especially strength work and HIIT, helps you hold on to muscle in a deficit, lifts the calories you burn, and makes it far easier to look after your appetite and your mood. Edge does not count your calories, and it will not tell you what to eat, because your food is yours to manage, ideally with support from a GP or a dietitian if you want numbers tailored to you. What Edge does is the other half of the equation: a fully personalised plan across running, strength, HIIT and mobility, ready in 15 minutes, with a real coach to message anytime. Because it treats running, strength and HIIT as one plan rather than separate apps, it is easy to stay consistent long enough to actually see results. Edge has 18,000+ members using it to do exactly that.

This article is general guidance, not medical advice. If you are new to exercise, returning from injury, pregnant, or managing a health condition, speak to your GP before starting, and see a physio for any niggle that does not settle.