Calculators
Free calculators for nutrition, fasting and strength. The maths runs in your browser, so nothing you enter is sent anywhere.
Nutrition
Work out calories, goals, macros and protein.
Calorie calculator
Estimate your basal metabolic rate (BMR) and daily maintenance calories from your sex, age, height, weight and activity level.
Weight goal calculator
Set a daily calorie target to lose weight, maintain or gain muscle, and see an estimated date to reach your goal weight.
Macro calculator
Split a daily calorie target into protein, carbohydrate and fat, in grams and as a share of calories.
Protein calculator
Find a daily protein range in grams from your body weight, goal and activity level.
Fasting
Plan an intermittent fasting schedule.
Strength
Estimate your max and plan your training weights.
Track this in Atlas
Log your food and training in Atlas and keep your targets in one place.
Coming soon
Calculators give estimates for healthy adults and are not medical advice. Talk to a qualified professional before changing your training or nutrition, especially if you have a health condition.