Free Fitness Calculators for Calories, Body & Nutrition
Make smarter health decisions with science-based fitness calculators. Instantly calculate calories, TDEE, BMI, body fat, macros, hydration and more.
Science-Based Formulas
Built using trusted formulas like Mifflin-St Jeor, US Navy Method, and widely accepted nutrition standards.
Metric & Imperial Units
All calculators support both metric and imperial units for global users.
Fast, Free & Private
No signup required. Get instant results without sharing personal data.
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View all calculators →Why Use Fitness Calculators?
Fitness calculators help you understand how your body works by turning personal data into meaningful insights. Whether your goal is weight loss, muscle gain, or maintaining a healthy lifestyle, calculators remove guesswork and provide clear direction.
FitnessVarsity calculators are designed for real-world use — simple inputs, transparent formulas, and practical results you can apply immediately.
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Thousands of users rely on FitnessVarsity to plan calories, nutrition, hydration, and weight goals more effectively.
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