Pediatric Dosage Calculator
Weight-based dosing calculator for common pediatric medications. Enter patient weight to calculate recommended doses.
Enter Patient Weight
Acetaminophen (Tylenol)
Pain/FeverDose
10-15 mg/kg/dose
Frequency
q4-6h
Max Dose
75 mg/kg/day or 4g/day
Max 5 doses/24h
Ibuprofen (Motrin/Advil)
Pain/FeverDose
5-10 mg/kg/dose
Frequency
q6-8h
Max Dose
40 mg/kg/day or 2.4g/day
>6 months old
Naproxen (Aleve)
Pain/FeverDose
5-7 mg/kg/dose
Frequency
q8-12h
Max Dose
1000 mg/day
>2 years old
Amoxicillin
AntibioticsDose
25-50 mg/kg/day
Frequency
divided q8-12h
Max Dose
3g/day
High dose: 80-90 mg/kg/day for AOM
Amoxicillin-Clavulanate (Augmentin)
AntibioticsDose
25-45 mg/kg/day (amox)
Frequency
divided q8-12h
Max Dose
3g/day amox
Use amoxicillin component for dosing
Azithromycin (Zithromax)
AntibioticsDose
10 mg/kg day 1, then 5 mg/kg
Frequency
daily x 5 days
Max Dose
500mg day 1, 250mg days 2-5
Also: 10 mg/kg x 3 days
Cephalexin (Keflex)
AntibioticsDose
25-50 mg/kg/day
Frequency
divided q6-8h
Max Dose
4g/day
Cefdinir (Omnicef)
AntibioticsDose
14 mg/kg/day
Frequency
divided q12-24h
Max Dose
600 mg/day
Trimethoprim-Sulfamethoxazole (Bactrim)
AntibioticsDose
8-10 mg/kg/day TMP
Frequency
divided q12h
Max Dose
320 mg TMP/day
Dose based on TMP component
Clindamycin
AntibioticsDose
20-40 mg/kg/day
Frequency
divided q6-8h
Max Dose
1.8g/day
Penicillin VK
AntibioticsDose
25-50 mg/kg/day
Frequency
divided q6-8h
Max Dose
3g/day
Albuterol (nebulized)
RespiratoryDose
0.15 mg/kg/dose
Frequency
q4-6h PRN
Max Dose
5 mg/dose
Min 1.25 mg, Max 5 mg
Albuterol (MDI)
RespiratoryDose
2-4 puffs
Frequency
q4-6h PRN
Use spacer in children
Prednisolone/Prednisone
RespiratoryDose
1-2 mg/kg/day
Frequency
daily or divided BID
Max Dose
60 mg/day
Asthma burst: 1-2 mg/kg x 3-5 days
Dexamethasone
RespiratoryDose
0.6 mg/kg/dose
Frequency
once
Max Dose
16 mg
Croup: 0.15-0.6 mg/kg
Montelukast (Singulair)
RespiratoryDose
4mg (2-5y), 5mg (6-14y)
Frequency
daily
Max Dose
10 mg
Chewable tabs for children
Ondansetron (Zofran)
GIDose
0.15 mg/kg/dose
Frequency
q8h PRN
Max Dose
8 mg/dose
8-15kg: 2mg, 15-30kg: 4mg, >30kg: 8mg
Ranitidine
GIDose
2-4 mg/kg/day
Frequency
divided BID
Max Dose
300 mg/day
Limited availability due to recall
Omeprazole (Prilosec)
GIDose
1 mg/kg/day
Frequency
daily or BID
Max Dose
20 mg/day
10-20kg: 10mg, >20kg: 20mg
Polyethylene Glycol (MiraLAX)
GIDose
0.5-1.5 g/kg/day
Frequency
daily
Max Dose
17g/day maintenance
Disimpaction: 1-1.5 g/kg/day
Diphenhydramine (Benadryl)
AllergyDose
1-1.25 mg/kg/dose
Frequency
q6h PRN
Max Dose
50 mg/dose
Also: 5 mg/kg/day divided q6h
Cetirizine (Zyrtec)
AllergyDose
2.5mg (6mo-2y), 5mg (2-6y)
Frequency
daily
Max Dose
10 mg/day
>6y: 5-10mg daily
Loratadine (Claritin)
AllergyDose
5mg (2-6y), 10mg (>6y)
Frequency
daily
Max Dose
10 mg/day
Fexofenadine (Allegra)
AllergyDose
30mg (2-11y)
Frequency
BID (2-11y), daily (>12y)
Max Dose
180 mg/day
Epinephrine (anaphylaxis)
AllergyDose
0.01 mg/kg
Frequency
IM, may repeat q5-15min
Max Dose
0.5 mg
EpiPen Jr 0.15mg (<30kg), EpiPen 0.3mg (≥30kg)
Diazepam rectal (Diastat)
NeurologicDose
0.2-0.5 mg/kg
Frequency
once, may repeat x1
Max Dose
20 mg
For seizures; round to available doses
Levetiracetam (Keppra)
NeurologicDose
10-30 mg/kg/day
Frequency
divided BID
Max Dose
3000 mg/day
Start 10 mg/kg/day, titrate
Ofloxacin otic (Floxin Otic)
EarDose
5-10 drops
Frequency
BID
<12y: 5 drops, ≥12y: 10 drops
Ciprofloxacin-Dexamethasone otic (Ciprodex)
EarDose
4 drops
Frequency
BID x 7 days
Clinical Disclaimer
This calculator is for reference only. Always verify doses with current formulary references, consider patient-specific factors (renal/hepatic function, drug interactions), and use clinical judgment. Dosing may vary by indication. This tool is not a substitute for professional medical advice.
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