Fluid Requirements · Normal Values
Formula: 4-2-1 rule
Notes
- 4 mL/kg/h for the first 10 kg
- plus 2 mL/kg/h for the second 10 kg (10–20 kg)
- plus 1 mL/kg/h for every kg after 20 kg
- Exceptions:
- PB: 5–8 mL/kg/h (Preterm birth)
- NB: 2–3 mL/kg/h (first 2–3 days)
- Baby: 4–6 mL/kg/h (Babies)
- with fever: +10 % for every °C
| Weight | Age (estimate) | Value |
|---|---|---|
| 2 kg | preterm | 10 to 16 milliliters per hour |
| 3 kg | newborn | 6 to 9 milliliters per hour |
| 4 kg | 1 mo | 16 to 24 milliliters per hour |
| 5 kg | 2 mo | 20 to 30 milliliters per hour |
| 6 kg | 4 mo | 24 to 36 milliliters per hour |
| 7 kg | 6 mo | 28 milliliters per hour |
| 8 kg | 8 mo | 32 milliliters per hour |
| 9 kg | 10 mo | 36 milliliters per hour |
| 10 kg | 1 y | 40 milliliters per hour |
| 11 kg | 1 y 6 mo | 42 milliliters per hour |
| 12 kg | 2 y | 44 milliliters per hour |
| 13 kg | 2 y 4 mo | 46 milliliters per hour |
| 14 kg | 2 y 8 mo | 48 milliliters per hour |
| 15 kg | 3 y | 50 milliliters per hour |
| 16 kg | 3 y 6 mo | 52 milliliters per hour |
| 17 kg | 4 y | 54 milliliters per hour |
| 18 kg | 4 y 6 mo | 56 milliliters per hour |
| 19 kg | 5 y | 58 milliliters per hour |
| 20 kg | 5 y 6 mo | 60 milliliters per hour |
| 21 kg | 6 y | 61 milliliters per hour |
| 22 kg | 6 y 4 mo | 62 milliliters per hour |
| 23 kg | 6 y 8 mo | 63 milliliters per hour |
| 24 kg | 7 y | 64 milliliters per hour |
| 25 kg | 7 y 4 mo | 65 milliliters per hour |
| 26 kg | 7 y 8 mo | 66 milliliters per hour |
| 27 kg | 8 y | 67 milliliters per hour |
| 28 kg | 8 y 4 mo | 68 milliliters per hour |
| 29 kg | 8 y 8 mo | 69 milliliters per hour |
| 30 kg | 9 y | 70 milliliters per hour |
| 31 kg | 9 y 4 mo | 71 milliliters per hour |
| 32 kg | 9 y 8 mo | 72 milliliters per hour |
| 33 kg | 10 y | 73 milliliters per hour |
| 34 kg | 10 y 3 mo | 74 milliliters per hour |
| 35 kg | 10 y 6 mo | 75 milliliters per hour |
| 36 kg | 10 y 9 mo | 76 milliliters per hour |
| 37 kg | 11 y | 77 milliliters per hour |
| 38 kg | 11 y 4 mo | 78 milliliters per hour |
| 39 kg | 11 y 8 mo | 79 milliliters per hour |
| 40 kg | 12 y | 80 milliliters per hour |