Calories tell you how much — macros tell you what
Two women can eat 1,800 calories a day and get completely different results. One eats enough protein to keep her muscle, enough fibre-rich carbs for energy, and enough healthy fat for hormones — she gets leaner and stronger. The other eats the same calories as mostly sugar and refined starch — she feels hungry, tired, and stuck. Same calories, different bodies. That is the macro story.
Macros are the three nutrients that supply your calories: protein, carbohydrates, and fat. How you split your calories between them shapes hunger, energy, muscle retention, and where lost weight actually comes from. And after 50, the split matters more than ever — because protein becomes your best defence against the muscle loss that quietly accelerates with age.
Enter your details below, and the calculator will estimate your daily calories and split them into personalised protein, carb, and fat targets in grams per day.
Macro splits by goal
The ranges the calculator works from. Protein is set first (it is the priority), then the remaining calories are shared between carbs and fat.
| Goal | Protein | Carbs | Fat |
|---|---|---|---|
| Lose weight | 30–35% of calories (1.6–2.2 g per kg of body weight) | 30–40% — favour whole grains, fruit, and vegetables | 25–35% — mostly unsaturated: olive oil, nuts, oily fish |
| Maintain weight | 25–30% of calories (1.2–1.6 g per kg) | 40–50% — the body’s preferred fuel for active days | 25–30% — enough for hormones and vitamin absorption |
| Gain muscle | 25–30% of calories (1.6–2.0 g per kg) | 45–55% — fuel for training and recovery | 20–30% — kept moderate to leave room for carbs |
Protein first: the over-50 rule
If you take one thing from this page, take this: after 50, protein is not optional extra — it is the main event. From around 40 onwards, women lose 3–8% of muscle per decade, and the decline accelerates after menopause. Muscle protects your bones, your balance, your metabolism, and your independence. And muscle is built from protein plus strength training — neither works well without the other.
Practically, that means aiming for a palm-sized portion of protein at every meal: eggs or Greek yoghurt at breakfast, chicken, fish, lentils, or tofu at lunch and dinner. Most women under-eat protein dramatically — if your day currently starts with toast and coffee, that single change (adding 20–30 grams of protein to breakfast) will do more for your body composition than any macro fine-tuning.
Carbs and fat are not the enemy
Somewhere along the way, carbs and fat both got demonised — wrongly. Carbohydrates are your brain and muscles’ preferred fuel; the issue was never carbs, it was refined carbs stripped of fibre. Whole grains, beans, fruit, and vegetables are among the healthiest foods on earth. Fat, meanwhile, is essential for hormones (increasingly precious through menopause), vitamin absorption, and feeling satisfied after meals.
The sane approach: hit your protein target, fill most of your carbs from whole foods, get your fats from olive oil, nuts, and fish rather than pastries — and stop fearing either one. Macro tracking works best as a two-to-four-week education in what food actually contains, not a lifelong accounting exercise.
This calculator is for general information only and is not medical advice. If you have diabetes, kidney disease, a history of disordered eating, or any medical condition, please speak to your doctor or a registered dietitian before changing your diet.