Free Health Calculators & Wellness Tools
Practical calculators, guided breathing, habit tracking and wellness tools you can use privately in your browser.
Explore all FitCalc tools
FitCalc Calculators
Quick estimates using your height, weight, age, activity, or daily exercise.
These results are general estimates, not medical advice. Individual needs can vary. Consult a qualified healthcare professional before making health decisions.
Wellness tools
FitCalc Wellness Toolkit
Build healthy routines with private tools that work directly in your browser.
Today’s Healthy Habits
Your checks stay on this device and reset for each new day.
Workout Interval Timer
Set work, rest, and rounds for HIIT, Tabata, or any interval workout.
Guided Breathing
Use a short visual breathing session for relaxation and focus.
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Healthy Challenge
Choose a simple challenge and mark one completed day at a time.
Start today and build your streak.
Wellness tools provide general support only. They do not diagnose, treat, or replace professional medical care. Progress is stored locally in this browser.
Designed for useful everyday estimates
- Adult BMI, BMR, daily energy, ideal weight and daily water estimates
- Habit tracking, guided breathing, interval timing and simple wellness challenges
- Metric and imperial inputs with responsive, accessible controls
- Results stay in the browser unless you deliberately use a Pro lead or email feature
Medical disclaimer: FitCalc provides general informational, educational, fitness and wellness estimates only. It is not medical advice, diagnosis or treatment. Consult a qualified healthcare professional before changing diet, exercise, medication or treatment. Do not use FitCalc for emergencies.
Start with the adult BMI calculator guide, or view the free FitCalc plugin on WordPress.org.
Detailed calculator and wellness guides
TDEE calculator
Estimate general daily energy expenditure from BMR and activity level.
Water intake calculator
Get a general hydration estimate with important safety limitations.
Guided breathing
Try box, 4-7-8 and calm breathing patterns in a private browser tool.
Continue with the 7-, 14- and 30-day health challenge tracker.