Burns Fluid Calculator

TBSA burned (A, %) Weight (B, kg) Time since burn (C, hours) Fluids already given (D, mL)

Step 1: 24 hr estimate (E) = 3 × A × B → — mL

Step 2: First 8 hrs (F) = E ÷ 2 → — mL

Step 3: Account for fluids given (G = F – D) → — mL

If G < 0, formula not suitable — seek senior burns input.

Step 4: Starting rate now (H = G ÷ (8 – C₍capped₎)) → — mL/hr

If time ≥ 8 h, seek burns team advice — calculation window elapsed.

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Start IV resuscitation at: — mL/hr

Urine Output Targets

• Paediatric: 1 mL/kg/hr
• Adult: 0.5–1 mL/kg/hr (≈30–50 mL/hr)