How to Count Calories for Beginners (UK Guide)

To count calories as a beginner, work out a daily calorie target, log everything you eat and drink in an app for a week, then compare your average with the target. You don’t need to be perfect: an honest estimate every day beats a perfect log twice a week.

Last updated: 8 November 2026 · By Alan Spicer

What does counting calories mean?

Counting calories means recording the energy in everything you eat and drink and adding it up each day. You compare that total with a daily target to see whether you’re likely to lose, maintain or gain weight.

A calorie deficit is when you take in fewer calories than your body uses. The NHS explains it simply: you’re likely to lose weight if you eat and drink fewer calories than you use, because your body uses its stored fat for energy.

I started counting after 18 months on GLP-1 medication. My video explains why I started and what I wanted to learn from it.

How many calories should you eat as a beginner?

The NHS guide is about 2,000kcal a day for an average woman and 2,500kcal for an average man to stay the same weight. Your own number depends on your age, height, weight and how active you are.

Source: NHS, Understanding calories.

A calorie app can work out a personal target in a minute. CaveCals asks for your age, height, weight, activity and goal, then suggests daily calories and an estimated date to reach your goal. My guide to how many calories to eat to lose weight explains the maths if you want to check it, and calorie deficits explained covers how big a gap is sensible.

How to count calories step by step

You can be counting properly by tomorrow. Here’s the order I’d follow:

1. Set your daily calorie target in an app, or use the NHS averages as a rough guide.
2. Log everything you eat and drink for seven days without changing what you eat.
3. Weigh the foods that are easy to get wrong: oil, butter, cereal, pasta, rice and cheese.
4. Scan barcodes for packaged food and use photos or search for meals.
5. Check your daily average at the end of the week, not each single day.
6. Make one change, such as a smaller portion of one food or more protein at breakfast, and keep logging.

The first week is about learning, not dieting. Most people are surprised by a few foods, and that’s the point.

How do you read calories on UK food labels?

UK labels show energy per 100g and usually per portion, in both kJ and kcal, and kcal is the number you want. Check the portion size on the pack, because a “serving” of cereal or crisps is often smaller than what people pour.

• Per 100g: use this to compare products or when you weigh your portion.
• Per portion: quick, but only if your portion matches theirs.
• Front-of-pack labels: the traffic light panel shows calories per portion at a glance.

The Food Standards Agency sets the rules for what goes on UK labels. Scanning the barcode saves reading it at all, because the app pulls the figures straight in.

What are the easiest ways to log food?

The easiest way to log is whichever takes you the fewest taps for that meal. Mixing methods is normal:

My favourite is Voice Log: I tell CaveCals what I had, like I’d tell a friend, and it turns it into entries with calories and macros. Meal Scan has been a life changer for me on home-cooked food. Quick Add makes repeat meals quick and painless.

What mistakes do beginners make?

The most common beginner mistake is forgetting the small things: cooking oil, milk in tea, sauces and the bits you eat while cooking. Those can add hundreds of calories a day without you noticing.

• Guessing portions: in a 1992 study, people who said they couldn’t lose weight under-reported what they ate by 47% on average.
• Skipping weekends: a 2008 study found people gained weight on weekend days but not weekdays, mostly from eating more on Saturdays.
• Forgetting drinks: a pint of 5% beer can be up to 222 calories, according to the NHS.
• Chasing perfect days: your weekly average matters more than any single day.

Sources: Lichtman et al. 1992; NHS Calories in alcohol; Harvey et al. 2019.

How long does calorie counting take each day?

Calorie counting takes longer in the first week and much less once your regular meals are saved. In the 2019 “Log Often, Lose More” trial, people spent about 23 minutes a day logging in the first month and under 15 minutes by month six.

Modern apps cut that further. Scanning a barcode or saying what you ate takes seconds, and apps that learn your usual foods put them one tap away. The same trial found people who lost the most logged in more often, so quick and frequent beats slow and occasional.

Do you need to count calories forever?

You don’t need to count calories forever. Most people count for a few weeks to learn what their portions look like, then go back to it when the scale stalls or life changes.

Think of it as a check-up for your eating: a week of honest logging tells you more than a month of guessing. If you’re losing weight with GLP-1 medication, my complete GLP-1 guide covers the medication side, and a protein target is worth tracking alongside calories.

People also ask

Frequently asked questions

What is a calorie?

A calorie (kcal on UK labels) is a unit of energy in food and drink. Your body uses energy to stay alive and move, and if you take in less energy than you use over time, your body uses stored fat to make up the difference.

How do I find calories on UK food labels?

UK labels show energy in kJ and kcal per 100g and usually per portion. Use the kcal figure, and check whether the portion on the pack matches what you eat. Front-of-pack traffic light labels also show calories per portion.

How long should I count calories for?

Many people count for a few weeks to learn their portions, then track on and off. A 2019 trial found the time spent logging fell from about 23 minutes a day in the first month to under 15 minutes by month six as people got quicker.

Should I count calories or macros?

Count calories first, because that decides weight change. Once that’s a habit, keep an eye on protein too. Most apps show calories and macros together, so you can do both without extra work.

Do drinks count when calorie counting?

Yes. Drinks with milk, sugar or alcohol all count. The NHS says a standard 175ml glass of 12% wine can contain up to 158 calories, and a pint of 5% beer up to 222.

What if I go over my calories one day?

Carry on as normal the next day. One day over doesn’t undo a week, and your weekly average matters more than any single day. Don’t cut back hard the next day to make up for it.

Are calorie counts on menus accurate?

Large food businesses in England have had to show calories on menus since April 2022, which helps. Treat any restaurant figure as a guide, because portions vary from kitchen to kitchen.

Can I count calories without an app?

Yes, a notebook and the labels on your food work. An app saves time because it does the adding up, keeps your regular meals and scans barcodes, and many are free.

Final thoughts

Counting calories as a beginner comes down to three things: know your rough daily number, log what you eat honestly for a week, and change one thing at a time. You don’t need perfect weighing or a perfect week to learn a lot.

The easiest way to start is a free app that does the adding up. I use CaveCals, because I can log a meal by taking a photo or just saying what I ate. If you want to compare options first, my best calorie tracker app UK guide covers ten apps.

Sources: [1] NHS: Understanding calories. [2] NHS: Calories in alcohol. [3] Harvey J et al. Log Often, Lose More, Obesity 2019. [4] Lichtman SW et al. NEJM 1992. [5] Racette SB et al. Weekend lifestyle patterns, Obesity 2008. [6] Food Standards Agency: Packaging and labelling.

Disclosure: some links on this page are affiliate links (including CaveCals). If you sign up or buy, I may earn a commission at no extra cost to you. I only recommend what I use or would use. Programme terms change, so check current terms on each site.