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Free Health Tools

Health & Fitness Calculators

Evidence-based calculators to track your health metrics, optimize nutrition, and reach your fitness goals. All tools are free, accurate, and based on scientific research.

6
Calculators
100%
Free Forever
Instant
Results
2025
Latest Science

Most Popular Calculators

2.74M/mo
BMI Calculator
Calculate your Body Mass Index and assess health risk with personalized recommendations.
Start Calculating
1M/mo
Calorie Calculator
Calculate daily calorie needs for weight loss, maintenance, or muscle gain based on your goals.
Start Calculating
450K/mo
TDEE Calculator
Calculate Total Daily Energy Expenditure including all activity to optimize your nutrition.
Start Calculating

All Calculators

2.74M
BMI Calculator
Calculate your Body Mass Index and assess health risk with personalized recommendations.
1M
Calorie Calculator
Calculate daily calorie needs for weight loss, maintenance, or muscle gain based on your goals.
450K
TDEE Calculator
Calculate Total Daily Energy Expenditure including all activity to optimize your nutrition.
135K
Macro Calculator
Calculate optimal protein, carbs, and fat distribution based on your calorie target and goals.
49.5K
Body Fat Calculator
Estimate body fat percentage using measurements for accurate body composition assessment.
2.4K
Biological Age Calculator
Estimate your biological age based on health markers and lifestyle factors for longevity insights.

Why Use Our Calculators?

Evidence-Based

All formulas based on peer-reviewed research and validated scientific studies.

Accurate Results

Using the most accurate equations (Mifflin-St Jeor, Navy Method, etc.).

Actionable Insights

Get personalized recommendations and practical next steps for your goals.

How to Get Started
Make the most of our health calculators
  1. 1
    Start with BMI or Calorie Calculator

    Get baseline metrics to understand your starting point.

  2. 2
    Use TDEE & Macro Calculators

    Determine your daily calorie needs and optimal macro distribution.

  3. 3
    Track Your Progress

    Recalculate every 2-4 weeks as your body changes and goals evolve.

  4. 4
    Monitor Body Composition

    Use body fat and biological age calculators to track quality of weight changes.

Track Your Health with AI

Take your health tracking to the next level with our AI-powered app. Automatically log meals, track macros, and get personalized recommendations.

Start with BMI Calculator