Medical Disclaimer

Last Updated: 2026-01-20

Important Notice

CalcFast health calculators are for informational and educational purposes only. They do not provide medical advice, diagnosis, or treatment recommendations. Always consult a qualified healthcare professional before making any health-related decisions.

1. Purpose of Our Health Calculators

CalcFast offers a variety of health-related calculators, including but not limited to:

  • BMI Calculator - Body Mass Index estimation
  • Calorie Calculator - Daily caloric needs estimation
  • Body Fat Calculator - Body fat percentage estimation
  • Ideal Weight Calculator - Healthy weight range estimation
  • Macro Calculator - Macronutrient distribution estimation
  • Heart Rate Zone Calculator - Exercise heart rate zones
  • Water Intake Calculator - Daily hydration recommendations
  • Pregnancy Calculator - Due date and milestone estimation

These tools are designed to provide general estimates and educational information. They use standardized formulas and population-based averages that may not accurately reflect your individual health status, needs, or circumstances.

2. What Our Calculators Are NOT

Our health calculators are NOT:

  • A substitute for professional medical advice, diagnosis, or treatment
  • A tool for self-diagnosis of any health condition
  • A replacement for consultations with healthcare providers
  • Intended to create a doctor-patient relationship
  • A basis for ignoring or delaying medical advice from qualified professionals

3. Limitations of Our Calculations

While we strive for accuracy using established formulas and methodologies, our calculators have inherent limitations:

3.1 Individual Variation

Results are based on population averages and standardized formulas. Individual factors such as genetics, medical conditions, medications, and lifestyle can significantly affect how these estimates apply to you personally.

3.2 BMI Limitations

BMI (Body Mass Index) is a screening tool, not a diagnostic measure. It does not:

  • Distinguish between muscle mass and fat mass
  • Account for fat distribution (visceral vs. subcutaneous)
  • Consider age, gender, ethnicity, or body composition differences
  • Apply accurately to athletes, pregnant women, elderly individuals, or children

3.3 Calorie and Nutrition Calculations

Calorie and macronutrient calculations are estimates based on formulas like Mifflin-St Jeor or Harris-Benedict equations. Actual metabolic rates vary significantly between individuals due to factors including:

  • Metabolic health and thyroid function
  • Muscle mass and body composition
  • Activity levels beyond reported exercise
  • Hormonal factors and medications
  • Environmental and genetic factors

3.4 Pregnancy Calculations

Pregnancy due date calculations are estimates based on average gestation periods. Actual delivery dates vary, and only your healthcare provider can provide accurate assessments through proper prenatal care.

4. When to Seek Professional Help

Always consult a qualified healthcare professional:

  • Before starting any new diet, exercise, or weight management program
  • If you have or suspect you have any medical condition
  • If calculator results concern you or seem unexpected
  • Before making any health-related decisions based on our calculators
  • If you are pregnant, nursing, or planning to become pregnant
  • If you are taking medications or have chronic health conditions
  • If you have a history of eating disorders or disordered eating

Emergency: If you are experiencing a medical emergency, call your local emergency services immediately. Do not rely on online calculators for emergency health situations.

5. Our Methodology

Our health calculators use peer-reviewed, scientifically established formulas including:

  • BMI: World Health Organization (WHO) standard formula
  • Calorie Needs: Mifflin-St Jeor equation (1990)
  • Body Fat: U.S. Navy and Jackson-Pollock methods
  • Ideal Weight: Devine, Robinson, Miller, and Hamwi formulas
  • Heart Rate Zones: Karvonen and percentage of max HR methods

While these formulas are widely accepted, they have limitations and may not reflect the latest medical research or apply equally to all populations.

6. No Warranty

The information provided by our health calculators is offered "as is" without any warranties, express or implied. CalcFast makes no representations or warranties regarding:

  • The accuracy, completeness, or reliability of calculator results
  • The suitability of results for any particular purpose
  • The applicability of results to your individual circumstances

7. Limitation of Liability

To the fullest extent permitted by law, CalcFast and its operators shall not be liable for any direct, indirect, incidental, consequential, or punitive damages arising from:

  • Your use of or reliance on our health calculators
  • Any decisions made based on calculator results
  • Any health outcomes related to using our tools
  • Errors or omissions in calculator results

8. Your Responsibility

By using our health calculators, you acknowledge and agree that:

  • You will use results for informational purposes only
  • You will consult healthcare professionals for medical decisions
  • You will not rely solely on our calculators for health assessments
  • You understand the limitations described in this disclaimer
  • You accept full responsibility for how you use calculator results

9. Contact Us

If you have questions about this Medical Disclaimer or our health calculators, please contact us:

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