FitNFO — Live Calculator Demos
Every calculator below is fully interactive. Enter your numbers and calculate instantly — 130 calculators across body composition, nutrition, strength, cardio and recovery, plus AI body analysis.
Body Composition
BMI Calculator
Enter your values and calculate instantly.
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Energy & Calories
TDEE Calculator
Enter your values and calculate instantly.
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Nutrition & Macros
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Water Intake Calculator
Enter your values and calculate instantly.
Strength & Power
One Rep Max Calculator
Enter your values and calculate instantly.
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Cardio & Endurance
Pace Calculator
Enter your values and calculate instantly.
VO2 Max Calculator
Enter your values and calculate instantly.
Recovery & Sleep
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AI Features (Demo Mode)
These run on your own OpenAI/Anthropic key. Without a key they show a labeled sample so you can preview the experience.
AI-Assisted Body and Goal Summary
Optional image analysis with explicit consent, plus deterministic BMI, BMR, and TDEE calculations.
Required notice and consent
AI output is an educational estimate, not a diagnosis or professional health, nutrition, or training recommendation. Verify important decisions with a qualified professional.
When submitted, the entered values and optional image are sent to the AI provider configured by the site administrator. FitNFO does not save the image.
AI Meal Idea Generator
General meal ideas with approximate calories and protein. Not a prescribed diet.
Browse the full set of 130 calculators on the Free, Pro and Enterprise pages.