Nutrition Calculators
Discover our collection of free nutrition calculators designed to help you optimize your diet. From calorie counting to macro tracking, every tool uses peer-reviewed formulas and is reviewed by a Registered Dietitian.
Calorie Calculator
Calculate your daily calorie needs based on age, gender, weight, height, and activity level using the Mifflin-St Jeor equation. Free and accurate.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) with precision. Factor in BMR, activity level, and exercise to find your true calorie burn.
Macro Calculator
Calculate your ideal macronutrient split for weight loss, muscle gain, or maintenance. Get personalized protein, carb, and fat targets in grams.
Protein Calculator
Find your optimal daily protein intake based on body weight, activity level, and fitness goals. Uses ISSN and WHO evidence-based guidelines.
BMI Calculator
Calculate your Body Mass Index (BMI) and see where you fall on the WHO health range chart. Supports both metric and imperial units instantly.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method with neck, waist, and hip measurements. See healthy body fat ranges by age and sex.
Water Intake Calculator
Calculate how much water you should drink daily based on your weight, activity level, and climate. Science-backed hydration recommendations.
Calorie Deficit Calculator
Calculate your ideal calorie deficit for safe, sustainable weight loss. See how long it takes to reach your goal weight with a personalized plan.
IF Calculator
Calculate your intermittent fasting schedule with custom eating windows. Choose from 16:8, 18:6, 20:4, or OMAD protocols with calorie targets.
Meal Plan Calculator
Split your daily calories across meals and snacks with a custom meal plan calculator. Choose 3-6 meals per day with balanced macro distribution.
Ideal Weight Calculator
Calculate your ideal weight range using Devine, Robinson, Miller, and Hamwi formulas. See healthy weight ranges customized by height and frame size.
CalcNest's nutrition calculators use formulas like the Mifflin-St Jeor equation and USDA dietary guidelines to give you accurate, personalized results. Whether you're tracking daily calories, optimizing your macronutrient ratios for weight loss or muscle gain, monitoring your BMI, estimating body fat percentage, or planning your water intake, our tools provide science-backed recommendations. Each calculator is reviewed by Sarah Mitchell, RD, MS Nutrition, ensuring alignment with the latest evidence from the Academy of Nutrition and Dietetics.