Burns Fluid Calculator Infographic Version

This tool mirrors the infographic wording and steps exactly (no reference to “first 8 hours” in labels).

Gather key information

TBSA — A (%)

Weight — B (kg)

Time since burn injury — C (hours)

If more than 7 hours, use 7.

IV fluids already given — D (mL)

Follow these five steps

Step 1. Estimate volume required in first 24 hours (from time of burn injury)

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E = 3 × A × B (mL)

Step 2. Adjust volume to account for initially maximally increased vascular permeability

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F = E ÷ 2 (mL)

Step 3. Adjust volume to account for any IV fluids already received

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G = F − D (mL)

Step 4. Adjust rate calculation to account for time elapsed since burn injury

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H = G ÷ (8 − C) (mL/hr)

Step 5. Start IV resuscitation fluids at rate

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Targets for ongoing titration

Paediatric patient target: 1 mL/kg/hr urine output.
Adult patient target: 0.5–1 mL/kg/hr (≈30–50 mL/hr).

Re‑evaluate urine output and fluid status every 1–2 hours during the first 24 hours post severe burn injury.

Titrate the rate based on urine output

If below target: increase rate by 10–20% and monitor response.
If above target: decrease rate by 10–20% and monitor response.

Important note

Patients presenting late and/or when large volumes of IV fluid have already been given may return a value < 0 mL. This flags complex fluid resuscitation requirements — seek expert burn clinician input prior to starting IV fluids.