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Fluid Calculator

Deficit, maintenance & hourly rates

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Fluid Therapy Plan
Deficit Replacement
-- mL
Over 4-6 hours
Maintenance
-- mL/day
24-hour period
Shock Bolus
-- mL
If indicated
Calculation Method
Deficit = Weight × Dehydration % × 10
Maintenance = Weight × Rate (mL/kg/day)
Total = Deficit + Maintenance + Bolus
💉 Fluid Type Recommendations
Isotonic Crystalloid
LRS, Normosol-R, Plasmalyte
Hypotonic Option
0.45% NaCl + 2.5% dextrose
💡 Clinical Pearls
  • Replace deficit over 4-6 hours in shock, 12-24 hours if stable
  • Subtract bolus volumes from deficit calculation
  • Add ongoing losses (vomiting, diarrhea) as needed
  • Reassess hydration status q4-6h during therapy