NICU · Fluid & Electrolyte Calculator
⚡ Starter
👶 Patient
Weight
g
mL/kg/d
mL/hr
mL/day
mL/kg/d
Bag Volume
250 mL
500 mL
1000 mL
30 mL
💊 Drip Order
💊 Single fluid
⚗️ Y-line
—
mg/kg/min
GIR
—
mL/hr
Run rate
—
mL/day
Daily vol
Central line? → Heparin
0.5 U/mL final concentration
📋 Mix Sheet ▶
⚗️ Electrolytes · tap column header for math
🍬 Dextrose
%
Dex %
Target GIR
Dex %
None
D5
D10
D12.5
D15
D20
🧂 Sodium
mEq/kg/d
Dose mEq/kg/d
1
2
3
4
or
¼NS
½NS
NS
🍌 Potassium
mEq/kg/d
0
1
2
3
4
KCl
K-Acetate
🦴 Calcium
mg/kg/d
0
100
200
300
Ca-Gluconate 10% · 100 mg/mL
📐 The Math Behind It
▶ expand
📐 One Formula
Dose math
dose × weight = total/day
total ÷ conc = mL/day
× (bag ÷ daily) = mL to add
Sodium
conc × bagVol = mEq in bag
already in base fluid — nothing to draw up
GIR
Dex% × rate ÷ 144 = mg/kg/min
Stoichiometry
A/B = C/D  →  solve C = A×D/B
same calc, every electrolyte
⚗️ Live Example
Patient
850g · 120 mL/kg/d · 250mL bag
🍌 Potassium
2 × 0.85 = 1.70 mEq/day
÷ 2 mEq/mL = 0.85 mL/day
× 250÷102 = 2.08 mL → add ✓
🦴 Calcium
200 × 0.85 = 170 mg/day
÷ 100 mg/mL = 1.70 mL/day
× 250÷102 = 4.17 mL → add ✓
🧂 Sodium (base fluid)
½NS = 0.077 mEq/mL × 250mL
= 19.25 mEq Na in bag
⚡ GIR
10% × 120 ÷ 144 = 8.3 mg/kg/min
🎯 Final Bag
GIR—
Na—
K—
Ca—
Run—
bag ÷ dailyVol = scale fraction
mL/day × fraction = mL to add