Fluid Balance Calculator
Calculate daily fluid balance including intake, output, insensible losses, and maintenance requirements for hospitalized patients.
Important Health Disclaimer
This calculator provides general health information based on standard medical formulas and WHO guidelines. Results are for informational and educational purposes only and should not be considered as professional medical advice, diagnosis, or treatment recommendations.
For health concerns, medical conditions, fitness plans, or dietary decisions, please consult with qualified healthcare professionals, licensed physicians, registered dietitians, or certified fitness trainers who can evaluate your individual health status and medical history.
Individual health needs vary significantly. These calculations are general estimates and may not be appropriate for everyone, especially those with existing medical conditions, pregnant women, children, or elderly individuals.
Not a substitute for professional medical advice
Patient Information
Intake (24hr)
Output (24hr)
Net Fluid Balance
+300 mL
Neutral Fluid Balance
Urine Output Assessment
Normal urine output (0.71 mL/kg/hr)
Recommendation
Fluid balance within acceptable range
Daily maintenance requirement: 2640 mL/day
Fluid Management Guidelines
4-2-1 Rule (Maintenance)
- First 10 kg: 4 mL/kg/hr
- Next 10 kg: 2 mL/kg/hr
- Each kg above 20: 1 mL/kg/hr
Insensible Losses
- Skin: ~300-500 mL/day
- Respiratory: ~300-500 mL/day
- Fever: +12% per degree above 37°C
- Mechanical ventilation: reduces by 50%
Help us improve!
How would you rate the Fluid Balance Calculator?
sources
- •World Health Organization (WHO) — Global health metrics, disease classification, and nutritional standards. who.int
- •Centers for Disease Control and Prevention (CDC) — Health statistics, BMI guidelines, and disease prevention data. cdc.gov
- •National Institutes of Health (NIH) — Medical research, clinical guidelines, and health calculators. nih.gov
- •Mayo Clinic — Clinical health information, disease reference, and wellness guidance. mayoclinic.org
For a complete list of all references used across the site, visit our full sources page.
Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
Formula Source: WHO Health Metrics Standards
by World Health Organization