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Macro calculators, protein targets, fiber, sodium, keto, and intermittent fasting — everything you need to dial in your nutrition.
Nutrition is the foundation of every fitness goal. Whether your objective is fat loss, muscle gain, performance improvement, or general health, what you eat determines the majority of your results. The Dietary Guidelines for Americans (2020–2025) and WHO nutritional recommendations form the evidence base for the calculators and content in this section.
The three macronutrients — protein, carbohydrates, and fat — each provide energy (measured in calories) and serve distinct physiological roles. Protein (4 kcal/g) builds and repairs tissue. Carbohydrates (4 kcal/g) are the primary fuel for high-intensity exercise and brain function. Fat (9 kcal/g) supports hormone production, fat-soluble vitamin absorption, and cell membrane integrity.
The NIH and USDA provide the following general daily reference values for healthy adults, which our calculators use as their baseline:
These are general reference values. Individual needs vary significantly based on body size, activity level, health conditions, age, and specific goals. Our calculators adjust these baselines to your personal data for more accurate, individualised targets.
Calorie counting tools are most useful in the early stages of changing your diet — they calibrate your sense of portion sizes and reveal hidden calorie sources. Research by Dhurandhar et al. published in the International Journal of Obesity found that people systematically underestimate their calorie intake by an average of 47%. Weighing food and tracking for 4–8 weeks builds the food literacy needed to eat intuitively and accurately without ongoing logging.
Micronutrients — vitamins, minerals, and phytonutrients — are not captured by calorie or macro calculators but are essential for health, performance, and recovery. A diet that hits all macro targets but is built from ultra-processed foods will produce poorer outcomes than the same calorie and protein intake from whole foods. The calculators here provide the quantitative framework; food quality determines the full picture.
Hydration is a nutritional factor that is frequently overlooked. Even mild dehydration — a loss of just 1–2% of body weight in fluid — reduces both cognitive and physical performance measurably. The National Academies recommend approximately 3.7 litres of total daily water for men and 2.7 litres for women, with roughly 20% coming from food. Active individuals and those in warm climates need significantly more.
The nutrition calculators in this section cover macronutrients, specific nutrient targets (fiber, sodium), specialised dietary approaches (ketogenic, intermittent fasting), and hydration. Use them together to build a complete, evidence-informed nutrition framework for your goal.