Macro tracking has a reputation problem. For every person who finds it genuinely useful, there's someone who burned out weighing individual blueberries or felt guilty about an untracked meal for three days. Neither of those outcomes is necessary. Tracking macros is a tool, and like any tool it works best when you understand what it's actually for and how to use it without overdoing it.
This guide covers the basics — what macros are, how to set sensible targets, which tools make life easier, and how to track in a way that informs rather than controls you.
What macros actually are
Macronutrients are the three main categories of energy-providing nutrients in food: protein, carbohydrates, and fat. That's it. Every food you eat contains some combination of them (and water, fibre, and micronutrients, but those aren't "macros" in the tracking sense).
Each macro provides calories:
- Protein: 4 kcal per gram
- Carbohydrates: 4 kcal per gram
- Fat: 9 kcal per gram
This is why calories sit at the top of the hierarchy. Your total calorie intake — the sum of everything you eat — determines whether you're gaining weight, losing it, or staying roughly the same. Macros determine what that weight change is made of. Eat in a surplus with plenty of protein and training to support it, and a greater share of the gain tends to be muscle. Eat in a deficit with protein high, and more of what you lose is fat rather than muscle tissue.
So macros and calories aren't separate things — macros are the building blocks that add up to your calorie total. Tracking macros is just a more detailed version of tracking calories.
How to set your targets
The order matters here. Don't start with an arbitrary macro split — start from the top down.
Step 1: Set your calorie target
Your calorie target depends on your goal. A rough starting point is to estimate your total daily energy expenditure — the calories you burn across the day including activity — and adjust from there. For fat loss, a moderate deficit (eating less than you burn) is the lever. For muscle gain, a small surplus or roughly maintenance works well for most people. For general health and body composition without a specific goal, maintenance is a sensible place to start.
There are various calculators online that estimate this from height, weight, age and activity level. They're not perfectly accurate — no calculator is — but they give you a workable starting point. Treat the number as a hypothesis, not a fact, and adjust based on what your weight does over two to four weeks.
Step 2: Set protein
Once you have a calorie target, protein is the macro to nail first. It's the most important for body composition: it supports muscle building and retention, and it's the most satiating of the three, which helps with adherence when eating in a deficit.
A reasonable target for most people who are active and training is somewhere in the region of 1.6–2.2g of protein per kilogram of bodyweight per day. You don't have to hit the top of that range to see good results — being consistently in that window matters more than hitting an exact figure. If you're in a larger body and find that figure feels very high, using a target based on your goal body weight or a rough 25–35% of calories from protein can be a simpler approach.
Step 3: Split the remaining calories between carbs and fat
After protein is set, the rest of your calories can come from carbohydrates and fat in whatever proportion suits you best. There's no magic ratio. Both are important — carbs fuel training and general energy, fat supports hormones and overall health — but the split is flexible. Some people feel better with more carbs; others prefer more fat. Try roughly 50/50 of remaining calories and adjust from there based on what keeps you feeling good and adhering consistently.
Tools that actually help
You don't need anything expensive or complicated. Two things make tracking significantly easier.
A food tracking app
Apps like MyFitnessPal, Cronometer, and Nutracheck (the latter built around UK food databases) let you log meals and see your macro totals at a glance. Most have large food databases, barcode scanners, and the ability to save meals you eat regularly, which cuts logging time dramatically once you've used them for a few weeks. None of them are perfect — databases contain errors, serving sizes aren't always standardised — but they're accurate enough to be genuinely useful.
The main thing to avoid is treating the app's output as gospel. It's an estimate. A consistently logged estimate is still very valuable; obsessing over individual entries to the last gram is not.
A food scale
Weighing food in grams is more reliable than using volume measures like cups or tablespoons, particularly for calorie-dense foods. It doesn't have to be time-consuming — for most meals, a few seconds on a scale removes a lot of guesswork. You don't need to weigh everything forever; many people find that after a few months of weighing, they've developed a good enough eye for common foods that they can switch to estimating most of the time.
Practical tracking habits
The mechanics are simple; the habits take a little building. A few things that help:
- Log as you go, not at the end of the day. Trying to reconstruct everything you've eaten from memory in the evening is frustrating and inaccurate. A quick log after each meal takes seconds.
- Pre-log meals you eat often. Most people eat a fairly small rotation of meals. Once they're saved in your app, logging them takes a tap.
- Weigh food before cooking where possible. Cooking changes the weight of most foods — meat loses water, pasta absorbs it. Raw weights are easier to cross-reference with database entries.
- Don't aim for perfection on every entry. A reasonable estimate of a home-cooked meal is better than not logging it at all because you're not sure of every ingredient.
Eating out and untracked days
These are the moments that tend to derail people who are being overly precise. Restaurants don't post their exact macros. Meals at someone else's house don't come with nutritional labels. That's fine — it's a normal part of life, not a problem to be solved.
For eating out, the most useful approach is to make a sensible estimate based on what you ordered and move on. Knowing roughly that a chicken breast is around 25–30g of protein and a large portion of rice is roughly 60–80g of carbohydrate gives you enough to make an informed guess. Log it, accept that it's approximate, and don't let it derail the rest of your day or week.
Untracked days happen. A day at a wedding, a holiday, a particularly hectic week — sometimes you don't track, and that's fine. Consistency over weeks and months matters far more than what happens on any individual day. One or two untracked days in a week doesn't erase a month of good work.
Accuracy versus perfectionism
This is probably the most important thing to understand about macro tracking: consistent and roughly accurate is far more useful than intermittently perfect. The goal is to have a realistic picture of your intake across the week, not to account for every single calorie to three decimal places.
Food databases aren't perfectly accurate. Cooking alters weights. Restaurant portions vary. Even the calories listed on food packaging have a margin of error allowed by food labelling regulations. Given all of that, chasing precision to the gram is a lot of effort for very little additional benefit — and it's one of the quickest routes to burning out on tracking altogether.
Aim to log consistently, be honest with your estimates, and review your results over time. If your weight is trending in the right direction and you're feeling good, your tracking is accurate enough. If things aren't moving as expected, that's your signal to review your logging habits before changing your targets.
- Calories sit at the top — macros are the detail that determines body composition.
- Set calories first, then protein (1.6–2.2g per kg bodyweight), then split the rest between carbs and fat to suit you.
- Use a food tracking app and a kitchen scale; log as you go, not from memory at the end of the day.
- Estimate eating out and let untracked days pass without guilt — consistency across the week is what counts.
- Consistently reasonable beats intermittently perfect every time.
When tracking isn't necessary
Macro tracking is useful, but it's not the only path to good results. For many people — particularly those who aren't working towards a specific body composition goal, or those who find that logging food triggers an unhealthy relationship with eating — a habit-based approach works just as well, or better.
This means building meals around a reliable protein source, filling a good portion of the plate with vegetables, including some starchy carbohydrate for energy, and eating slowly enough to notice when you're full. No logging, no weighing — just consistent habits applied across most meals.
Tracking adds value when you want a clearer picture of your intake, when progress has stalled and you suspect your estimates are off, or when you're working towards a specific goal and want to make sure your nutrition is dialled in. It's a tool for a job, not a permanent requirement. Use it when it helps, set it aside when it doesn't.
If you'd rather have a coach set your targets, review your progress and tell you when to adjust, that's exactly what online nutrition coaching is for — without the guesswork or the spiral.