BodyCalWhat 'macros' actually means
Macros — short for macronutrients — are the three nutrients your body needs in large amounts: protein, carbohydrate, and fat. Every calorie you eat comes from one of them (alcohol aside). Protein and carbs each provide 4 calories per gram, and fat provides 9. Counting macros simply means tracking how many grams of each you eat, instead of watching calories alone.
Why bother going beyond calories? Because the same calorie total can build very different bodies. A diet that hits your calories but skimps on protein tends to lose muscle alongside fat; one with enough protein holds onto muscle and keeps you fuller. Macros let you control the quality of your weight loss, not just the quantity.
Step 1: Set your calorie target
Macros live inside a calorie budget, so that comes first. Work out your maintenance calories (the amount that keeps your weight stable), then subtract a moderate deficit — around 20% — for steady fat loss. For most people that lands somewhere between 1,500 and 2,200 calories a day while dieting.
You don't need to do this by hand. Our macro calculator estimates your maintenance from your age, height, weight, and activity, applies your goal, and hands you the calorie number to build your macros on.
Step 2: Set protein first
Protein is the macro that matters most when you're losing weight, because it protects muscle and controls hunger. Aim for roughly 1.6 to 2.2 grams of protein per kilogram of body weight per day — for an 80 kg person, that's about 130 to 175 grams.
Build meals around a protein source — chicken, fish, eggs, Greek yoghurt, tofu, legumes — and you'll hit this target far more easily than trying to bolt protein on at the end of the day.
Step 3: Divide the rest between carbs and fat
Once protein is set, the remaining calories get split between carbohydrate and fat — and here personal preference rules. If you train hard or love bread, rice, and fruit, lean toward more carbs. If you feel better on richer, fattier meals, shift toward fat. Neither should go extremely low: carbs fuel hard workouts and brain function, and fat supports your hormones and vitamin absorption.
A balanced 30% protein, 40% carbs, 30% fat split is a reliable starting point. The macro calculator offers balanced, lower-carb, and higher-protein presets so you can see the grams change instantly and pick what suits you.
Step 4: Track without obsessing
Use any food-tracking app, weigh your portions for the first couple of weeks to calibrate your eye, and aim to land within about 5 to 10 grams of each target most days. You do not need to be perfect — consistency across the week beats precision on any single day.
If tracking all three macros feels like too much at first, just track calories and protein. That captures the large majority of the benefit and is far easier to sustain. You can always add carbs and fat later once the habit sticks.
Common mistakes to avoid
The big ones: setting protein too low, cutting carbs so hard your workouts collapse, forgetting that cooking oils and dressings are pure fat calories, and never recalculating. As you lose weight your calorie needs fall, so revisit your numbers every few weeks.
Most importantly, don't let macros become a source of stress. They're a tool to make eating intentional, not a set of rules to feel guilty about. Get your calories and protein roughly right, stay consistent, and the results follow.