Calorie counting has a reputation for being tedious, obsessive, or unsustainable. Done badly, it is. Done well, it's the clearest feedback mechanism you have about your food intake — and for most people, 4–8 weeks of accurate tracking is enough to build lasting nutritional intuition that doesn't require a spreadsheet. Here's how to do it properly from the start.
Step 1: Find Your Calorie Target
Before tracking a single meal, you need to know how many calories to aim for. This number is different for every person — it depends on your height, weight, age, sex, and activity level.
The starting point is your TDEE: your Total Daily Energy Expenditure, which is the estimated number of calories you burn in a day. To lose weight, eat below it. To gain muscle, eat above it. To maintain, eat at it.
Use our TDEE calculator to get your number in 30 seconds. It uses the Mifflin-St Jeor equation — the most validated formula for estimating daily calorie needs in adults. The result is your baseline: your maintenance calories. From there:
- Fat loss: Subtract 300–500 kcal from your TDEE
- Muscle gain: Add 200–300 kcal to your TDEE
- Maintenance: Eat at your TDEE
For a more detailed look at deficit sizing and projected weight loss timelines, our calorie deficit calculator walks through the options.
Step 2: Get a Kitchen Scale
The single biggest mistake beginners make is estimating portion sizes by eye. Research consistently shows people underestimate calorie intake by 20–40% when estimating visually. A portion of peanut butter "about a tablespoon" is often 2–3 tablespoons when measured. A bowl of pasta "for one" can easily be 250–300g cooked weight — not the 100g dry that recipes typically specify.
A kitchen scale costs £8–12 at Tesco or Amazon. It is the most important tool in calorie counting. Use it for the first 4–6 weeks until you've developed accurate visual intuition for your most common foods. After that, spot-check occasionally — most people's estimates drift over time.
Step 3: Choose a Tracking Method
The most popular options in the UK:
- Cronometer (free): Most accurate food database, strong micronutrient tracking, reliable for UK foods
- MyFitnessPal (free tier): Largest food database, widely used, but database has user-submitted errors — verify entries for common foods
- Nutracheck (UK-specific): Built around UK food products and portion sizes, paid subscription (around £8/month)
- Manual log: A notebook or spreadsheet. Slower but entirely valid — requires looking up nutritional info from packaging or the NHS food database
Most beginners do best with an app. The barcode scanner (on Cronometer and MyFitnessPal) makes logging packaged UK foods nearly instant — scan the barcode, enter the weight, done.
Step 4: Log Everything, Including Cooking Fats
The most common calorie tracking gaps for beginners:
- Cooking oil: A tablespoon of olive oil is 120 kcal. Two tablespoons for a stir fry is 240 kcal — almost 15% of a 1,600 kcal day, invisible if you don't log it.
- Drinks: Lattes, fruit juices, sugary drinks, and alcohol all carry significant calories. A 330ml glass of orange juice is 150 kcal.
- Sauces and condiments: Mayonnaise (90–100 kcal per tablespoon), ketchup (15 kcal per tablespoon), salad dressings (60–150 kcal per tablespoon).
- Bites and tastes: A bite of bread while cooking, a handful of nuts, the end of a child's meal. These add up to 100–300 kcal per day for most people who don't log them.
You don't need to be perfect. But you do need to be honest. Logging everything — including the things that seem too small to matter — is how you get accurate data.
Step 5: Understand Raw vs Cooked Weights
Food databases typically list nutritional info for raw (uncooked) weight, but cooked food weighs differently. Pasta and rice absorb water when cooked — 100g dry pasta becomes 220–250g cooked. Meat loses water — 200g raw chicken breast becomes roughly 140–160g cooked. If you log raw weights, weigh before cooking. If you log cooked weights, use a cooked food database entry.
Inconsistency here is where most calorie tracking errors occur. Pick one method and stick to it for your regular foods.
Step 6: Review Weekly, Not Daily
Day-to-day calorie intake fluctuates naturally. A day you eat 300 calories over your target isn't a failure — it's Tuesday. What matters is the weekly average. If your daily target is 1,800 kcal, your weekly budget is 12,600 kcal. Being over by 300 kcal one day and under by 200 kcal another day still leaves you close to target for the week.
This also handles social situations without stress. A meal out, a birthday dinner, or a weekend with higher calories doesn't derail progress — it's one data point in a weekly average. Compensating with lower-calorie days the rest of the week is effective and sustainable.
When to Stop Counting
Calorie counting is a tool, not a permanent state. Most people find that 6–12 weeks of accurate tracking builds enough nutritional literacy to eat intuitively within a reasonable range. The goal isn't to count forever — it's to develop an accurate internal model of what you're eating. Once you know instinctively that your standard lunch is 550 kcal and your usual dinner is 650 kcal, you don't need to log them every day.
Use counting as a periodic recalibration when things drift, not as a permanent overhead. And if you want to skip the manual tracking entirely, our meal planner generates a full week of meals pre-calculated to your calorie target, so the numbers are already done before you start cooking.