People talk about “hitting their macros” on keto as though it were obvious, and for a beginner it usually is not. Macros are simply the three macronutrients that supply energy: protein, fat and carbohydrate. A ketogenic diet works by keeping carbohydrate very low so the body shifts to burning fat for fuel, which means the way you divide your calories between the three matters more here than on most diets.
The three numbers
Carbohydrate is the one you cap. Most people stay in ketosis on twenty to fifty grams of net carbs a day, and twenty is the usual starting point. Keep it low and consistent and the rest of the diet does its work.
Protein sits in the middle. You want enough to hold on to muscle, roughly one and a half grams per kilogram of body weight for most people, a little more if you train hard. Very high protein is unnecessary and can blunt ketosis slightly in some people, so moderate is the sensible default.
Fat is the lever. Once carbs are capped and protein is set, fat makes up the rest of your calories. On a maintenance day that means plenty of it; in a fat-loss phase you eat less of it and let your body draw on its own stores instead. Fat is not the enemy on keto, but it is also not something to force down beyond your calorie target.
Why the split is expressed as percentages
You will often see keto described as something like seventy per cent fat, twenty-five per cent protein, five per cent carbs. Those percentages are a rough description of where most people land, not a rule to chase. The grams matter more than the percentages, because a percentage of a small calorie target is very different from a percentage of a large one. Set your carbs and protein in grams first, and the percentages fall out of that.
Working out your own numbers
Rather than guess, put your details into the keto macro calculator. It estimates your daily calories from your weight, height, age and activity, adjusts for whether you want to lose, maintain or gain, then splits the calories into the three macros for you. Treat the result as a starting point and adjust after a couple of weeks based on how you are actually doing, since these formulas are averages and you are not average.
Do you have to track forever?
No. Tracking is most useful at the start, while you learn what your meals actually contain, because almost everyone misjudges this early on. After a month or two many people stop weighing and logging and simply keep to familiar meals that they know fit. The numbers are a teaching tool more than a permanent chore.
This is general information about the ketogenic diet, not medical advice. Keto does not suit everyone; if you are pregnant, on medication, or managing a condition such as diabetes, speak to a doctor or dietitian first.