TDEE & Macro Calculator (South Africa)

If you've ever stared at a food label wondering "okay, but how much should I actually be eating?" — you're not alone. Every South African weight-loss plan, from Banting to the humble kilojoule-counted diet, ultimately comes back to one number: how much energy your body burns in a day. That number is called your TDEE (Total Daily Energy Expenditure), and once you know it, working out how much to eat to lose weight, maintain, or build a bit of muscle becomes a lot less guesswork and a lot more science. This free calculator works out your TDEE, your BMR (the calories you'd burn just lying in bed all day), and a practical protein, carb and fat breakdown for whatever goal you're chasing.

Think of this as the "missing maths" behind every diet plan on this site. Whether you're following Banting, 16:8 intermittent fasting, or just trying to eat a bit less than you burn, your TDEE is the number to build around. No medical degree required — just your height, weight, age and how active you honestly are.

How These Numbers Actually Work

There are two numbers doing the heavy lifting here, and it helps to know the difference:

• BMR (Basal Metabolic Rate) is the energy your body needs just to keep you alive — breathing, pumping blood, keeping your organs running — if you did nothing but rest in bed for 24 hours. We calculate this using the Mifflin-St Jeor formula, which asks for your sex, age, height and weight.
• TDEE (Total Daily Energy Expenditure) takes your BMR and multiplies it by an activity factor to account for movement — everything from walking to the taxi rank to a full gym session. This is the realistic number of calories your body burns in an average day, and it's the number you actually want to eat around.

From there, your goal simply adjusts your target up or down from TDEE. Eat roughly at TDEE and your weight holds steady. Eat consistently below it and you lose weight, because your body pulls the shortfall from stored fat. Eat above it and you gain. It's mechanically simple — the hard part is the "consistently" bit, which is exactly what a realistic macro plan and a diet you can actually stick to are for.

A quick honest note on accuracy: no formula can know your exact metabolism. Mifflin-St Jeor is considered the best general-purpose estimate available, but real-world numbers can vary by around 10% depending on genetics, muscle mass, hormones and sleep. Treat your result as a smart starting point, then adjust based on what happens to your weight over the following 2-3 weeks.

Understanding Your Deficit Options

We've kept the goal options simple on purpose, because bigger isn't always better when it comes to a calorie deficit:

• Mild deficit (~300 kcal/day below TDEE): The most sustainable option for most people. Slower results, but far easier to stick to for months, and less likely to leave you constantly hungry, tired, or losing muscle along with fat.
• Moderate deficit (~500 kcal/day below TDEE): The classic "textbook" recommendation, roughly in line with losing about half a kilogram a week. A solid middle ground for most South Africans starting a weight-loss journey.
• Aggressive deficit (~750 kcal/day below TDEE): Faster results, but harder to sustain, and best suited to people with more weight to lose, under short, defined time frames — think along the lines of the structured approach used in our 800 calorie diet guide. Not recommended as a long-term default.

Whichever option you choose, the calculator will never suggest fewer than roughly 1 200 kcal a day for women or 1 500 kcal a day for men — going lower without medical supervision risks nutrient deficiencies, muscle loss and a metabolism that fights back hard. If your target lands near that floor, treat it as a cue to speak to a doctor or dietitian first, not to push lower.

What Are Macros, and Why Should You Care?

"Macros" is just short for macronutrients — the three big categories of energy-providing nutrients: protein, carbohydrates and fat. Every food you eat is some combination of these three (plus fibre, water, vitamins and minerals along for the ride). Counting calories alone tells you how much you're eating; tracking macros tells you what that food is actually made of — and that matters a lot for how you look, feel and perform while losing weight.

Protein — Your Non-Negotiable

Protein is the one macro we don't flex much on, whatever your goal. It keeps you fuller for longer, helps preserve muscle while you're in a calorie deficit, and burns slightly more energy just to digest than carbs or fat. Our calculator targets roughly 1.8 g of protein per kilogram of body weight — a solid, evidence-based range for weight loss without obsessing over every gram. Good, affordable South African sources include eggs, tinned pilchards and tuna, chicken, biltong in moderation, Greek-style or plain low-fat yoghurt, cottage cheese, lentils and chickpeas.

Fat — Not the Enemy

Dietary fat got a reputation in the 80s and 90s it never really deserved. It's essential for hormone production, absorbing vitamins A, D, E and K, and making food satisfying. This calculator allocates around 25% of daily calories to fat, from sources like olive oil, avocado, nuts and seeds, full-fat yoghurt, and fatty fish like pilchards or salmon.

Carbohydrates — Your Flexible Fuel

Whatever is left after protein and fat is allocated goes to carbohydrates — your preferred fuel for exercise and brain function. This is deliberately the most flexible macro, since how many carbs suit you best depends on personal preference and activity level, and whether you do better on a lower-carb approach (like Banting) or a more moderate one. Prioritise pap made with stoneground maize meal, sweet potato, brown rice, oats, legumes, and plenty of vegetables and fruit over refined white bread, sugary cereal or cooldrink. A cup of rooibos tea, meanwhile, is essentially calorie-free and won't touch your macros at all.

Practical Tips for Hitting Your Numbers

• Weigh yourself under consistent conditions. Same time of day, ideally first thing in the morning, and track the weekly trend rather than daily fluctuations — water weight and hormones move the scale more than fat does.
• Re-calculate every 5-7 kg lost. Your TDEE drops as your body weight drops, since a smaller body burns less energy at rest.
• Hit your protein target first. If you only track one number consistently, make it protein — it does the most work for satiety and muscle preservation.
• Use SA food labels in kilojoules. Local packaging shows kJ, not calories. Roughly, 1 kcal = 4.184 kJ, so multiply your kcal target by about 4.2 to compare against food labels.
• Don't chase perfection. Hitting your targets within about 5-10% most days beats being "perfect" for two weeks and then giving up.
• Adjust the activity level honestly. Most people overestimate how active they are — pick the lower option if unsure.
• Pair your numbers with a real plan. Browse our Diet Plans hub for structured South African meal plans that fit different targets.

Putting Your Numbers to Work

Once you've got your TDEE and macro targets, the next step is choosing an eating style you can actually live with while hitting them. If you'd prefer fewer decisions, a kilojoule-counted plan like our 7600 kilojoule diet or 5000 kilojoule diet does a lot of the planning for you. If you'd rather eat within a shorter window each day, 16:8 intermittent fasting pairs well with any target above. And if lower-carb eating suits you better, the Banting diet plan is a well-established South African favourite.

Whatever you choose, these numbers are a compass, not a cage. Bodies respond differently, weeks vary, and life happens — a birthday, a braai, a stressful week at work. What matters is the average over weeks and months, not any single day. Come back and recalculate as your weight or activity changes, and be patient with yourself along the way.