Macro Calculator
Calculate your personalised daily macronutrient targets based on your individual characteristics and fitness goals. Enter your details below to determine your optimal protein, carbohydrate, and fat intake.
Your Daily Targets
Calories
Protein
Carbohydrates
Fats
How to Use This Calculator
Step 1: Enter Your Details
Provide accurate measurements for your gender, age, weight, and height. Precise inputs generate more accurate macronutrient recommendations tailored to your metabolic needs.
Step 2: Select Activity Level
Choose the option that best reflects your weekly physical activity. Most individuals with desk jobs and moderate gym attendance fall into the “moderately active” category. Those with physically demanding occupations or intense daily training may select higher activity levels.
Step 3: Define Your Goal
Select weight loss for fat reduction, maintain weight for body recomposition, or muscle gain for building mass. Your choice determines the calorie adjustment applied to your maintenance level.
Step 4: Review Your Targets
Your personalised daily calorie and macronutrient targets will appear instantly. These numbers represent your starting point for tracking your nutrition.
Macronutrient Principles
Protein
Protein consists of amino acids that serve as building blocks for muscle tissue, enzymes, hormones, and other bodily structures. Adequate protein intake supports muscle maintenance during weight loss and muscle growth during strength training. The calculator recommends 1.8-2.2g per kg of body weight for active individuals, which exceeds standard dietary reference values but aligns with sports nutrition research for optimal body composition.
Carbohydrates
Carbohydrates provide the primary fuel source for high-intensity exercise and brain function. They replenish muscle glycogen stores depleted during training. Contrary to popular misconceptions, carbohydrates do not directly cause fat gain unless consumed in a calorie surplus. The calculator allocates carbohydrates after protein and fat requirements are met, ensuring adequate energy for performance and recovery.
Fats
Dietary fats support hormone production, nutrient absorption, cell membrane integrity, and organ protection. Essential fatty acids must be obtained through diet. The calculator sets fat intake at approximately 25-30% of total calories, prioritising sufficient intake for health whilst allowing flexibility for carbohydrate allocation. Focus on unsaturated fats from sources like olive oil, nuts, seeds, and oily fish.
Energy Balance
Your total daily energy expenditure comprises your basal metabolic rate (energy needed for basic physiological functions) multiplied by an activity factor. Weight loss requires a calorie deficit of approximately 300-500 kcal below maintenance, whilst muscle gain requires a surplus of 200-400 kcal above maintenance. These moderate adjustments promote sustainable progress whilst preserving metabolic health.
Macronutrient Content in Common Foods
| Food (100g serving) | Protein (g) | Carbs (g) | Fat (g) | Calories (kcal) |
|---|---|---|---|---|
| Chicken breast (cooked) | 31 | 0 | 3.6 | 165 |
| Salmon (cooked) | 25 | 0 | 12 | 206 |
| Eggs (whole, large) | 13 | 1.1 | 11 | 155 |
| Lean beef mince (cooked) | 26 | 0 | 15 | 250 |
| Whey protein powder | 70-80 | 5-8 | 2-5 | 370-400 |
| Greek yoghurt (0% fat) | 10 | 4 | 0.4 | 59 |
| Brown rice (cooked) | 2.6 | 23 | 0.9 | 111 |
| Oats (dry) | 13.2 | 67 | 6.9 | 389 |
| Sweet potato (cooked) | 2 | 20 | 0.2 | 90 |
| Wholemeal bread | 9 | 41 | 3.4 | 247 |
| Banana | 1.1 | 23 | 0.3 | 89 |
| Almonds | 21 | 22 | 50 | 579 |
| Avocado | 2 | 9 | 15 | 160 |
| Olive oil | 0 | 0 | 100 | 884 |
| Broccoli (cooked) | 2.4 | 7 | 0.4 | 35 |
Macro Tracking Strategies
Weighing and Measuring
Digital kitchen scales provide the most accurate method for tracking macronutrient intake. Weigh foods in their raw state when possible, as cooking alters weight through water loss or absorption. Create a database of your frequently consumed meals to streamline daily tracking.
Flexible Dieting Approach
The “If It Fits Your Macros” philosophy allows food variety whilst meeting macro targets. No foods are inherently forbidden provided they fit within your daily allocations. However, prioritise nutrient-dense whole foods for 80-90% of intake to support health, satiety, and micronutrient needs.
Meal Timing Considerations
Total daily macronutrient intake matters more than specific meal timing for most individuals. However, consuming protein distributed across 3-5 meals optimises muscle protein synthesis. Position higher carbohydrate meals around training sessions to fuel performance and support recovery.
Adjusting Over Time
Monitor body weight, measurements, and progress photos every 1-2 weeks. If weight loss stalls despite adherence, reduce calories by 100-200 kcal (primarily from carbohydrates or fats). If muscle gain is too rapid with excessive fat accumulation, reduce surplus by 100-150 kcal. Metabolic adaptation occurs over time, requiring periodic adjustments.
Frequently Asked Questions
Non-starchy vegetables like broccoli, spinach, peppers, and courgettes are low in calories and rich in fibre and micronutrients. Whilst they contain small amounts of carbohydrates, many people choose not to track them strictly due to their minimal caloric impact. However, starchy vegetables like potatoes, sweetcorn, and peas should be tracked as they contain significant carbohydrates.
Alcohol provides 7 calories per gram but is not a macronutrient. To accommodate alcoholic beverages, reduce your carbohydrate or fat allocation by the equivalent calories whilst maintaining protein intake. For example, 50g of alcohol (approximately 4 standard drinks) provides 350 calories, equivalent to about 88g of carbohydrates or 39g of fat.
Protein supplements like whey, casein, or plant-based powders offer a convenient, cost-effective method to increase protein intake. A single 30g serving typically provides 20-25g of protein. However, whole food sources should form the foundation of your diet, with supplements filling gaps as needed.
Some individuals prefer higher carbohydrate intake on training days to fuel performance, with lower carbohydrates and higher fats on rest days. This approach, called “carb cycling,” can work provided weekly total calories and protein remain consistent. For beginners, maintaining consistent daily macros simplifies adherence.
Aim for 90-95% accuracy most days. Minor deviations will not derail progress, but consistent under-reporting or over-reporting can prevent you from reaching your goals. Be particularly mindful of calorie-dense items like oils, nuts, and sauces, as small measurement errors significantly impact total intake.
Fat intake should not fall below 0.6-0.8g per kg of body weight to support hormone production and overall health. Very low-fat diets can impair testosterone production, nutrient absorption, and satiety. The calculator ensures fat intake remains within healthy ranges.
Initial changes in body weight often occur within the first week due to water and glycogen fluctuations. Meaningful fat loss or muscle gain typically becomes apparent after 3-4 weeks of consistent adherence. Take measurements and photos every 2 weeks to track progress beyond scale weight.
Yes, as your body weight changes, your calorie needs change accordingly. Recalculate your macros every 5-7kg of weight change, or if progress stalls for more than 2-3 weeks despite adherence. Your activity level may also change over time, warranting recalculation.
References
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- Morton, R.W., Murphy, K.T., McKellar, S.R., Schoenfeld, B.J., Henselmans, M., Helms, E., Aragon, A.A., Devries, M.C., Banfield, L., Krieger, J.W. and Phillips, S.M. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 52(6), pp.376-384.
- Helms, E.R., Aragon, A.A. and Fitschen, P.J. (2014). Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation. Journal of the International Society of Sports Nutrition, 11(1), p.20.
- Mifflin, M.D., St Jeor, S.T., Hill, L.A., Scott, B.J., Daugherty, S.A. and Koh, Y.O. (1990). A new predictive equation for resting energy expenditure in healthy individuals. The American Journal of Clinical Nutrition, 51(2), pp.241-247.
- Howell, S. and Kones, R. (2017). “Calories in, calories out” and macronutrient intake: the hope, hype, and science of calories. American Journal of Physiology-Endocrinology and Metabolism, 313(5), pp.E608-E612.
- Thomas, D.T., Erdman, K.A. and Burke, L.M. (2016). American College of Sports Medicine Joint Position Statement. Nutrition and Athletic Performance. Medicine and Science in Sports and Exercise, 48(3), pp.543-568.
- Aragon, A.A., Schoenfeld, B.J., Wildman, R., Kleiner, S., VanDusseldorp, T., Taylor, L., Earnest, C.P., Arciero, P.J., Wilborn, C., Kalman, D.S. and Stout, J.R. (2017). International society of sports nutrition position stand: diets and body composition. Journal of the International Society of Sports Nutrition, 14(1), p.16.
- Kerksick, C.M., Wilborn, C.D., Roberts, M.D., Smith-Ryan, A., Kleiner, S.M., Jäger, R., Collins, R., Cooke, M., Davis, J.N., Galvan, E. and Greenwood, M. (2018). ISSN exercise & sports nutrition review update: research & recommendations. Journal of the International Society of Sports Nutrition, 15(1), p.38.