Fluid Balance Calculator
Calculate daily fluid balance including intake, output, insensible losses, and maintenance requirements for hospitalized patients.
Patient Information
Intake (24hr)
mL
mL
mL
Output (24hr)
mL
mL
Net Fluid Balance
+300 mL
Neutral Fluid Balance
⬇️Total Intake
2100 mL
⬆️Total Output
1800 mL
💨Insensible Loss
500 mL
💧Maintenance Rate
110 mL/hr
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%