Amoxicillin Dosage Calculator

The standard pediatric dose is 25 to 45 mg/kg/day divided into 2 or 3 doses for mild infections. For ear infections (otitis media), sinusitis, and pneumonia, the AAP recommends high-dose amoxicillin at 80 to 90 mg/kg/day divided into 2 doses. For example, a 10 kg child at the standard 40 mg/kg/day rate receives 400 mg daily, or 200 mg every 12 hours.

Divide the per-dose amount in mg by 250, then multiply by 5 to get the volume in mL. For a 15 kg child on 80 mg/kg/day (600 mg per dose twice daily): 600 / 250 x 5 = 12 mL per dose. For a 10 kg child on 40 mg/kg/day (200 mg per dose twice daily): 200 / 250 x 5 = 4 mL per dose. Always use the measuring syringe provided with the medication.

The American Academy of Pediatrics recommends high-dose amoxicillin at 80 to 90 mg/kg/day divided into 2 doses for acute otitis media. This higher dose is needed because ear infections are often caused by bacteria that require higher antibiotic concentrations to be effective. Treatment typically lasts 7 to 10 days for children under 2 years and 5 to 7 days for older children.

Both regimens are used depending on the infection and prescriber preference. High-dose amoxicillin for ear infections is typically given twice daily (every 12 hours) for better compliance. Standard-dose amoxicillin for strep throat or mild infections may be prescribed three times daily (every 8 hours). Your doctor will specify the frequency based on the infection being treated.

The most common side effects are diarrhea (affects 10 to 20% of children), diaper rash (from diarrhea), mild nausea or vomiting, and skin rash (3 to 5%). A non-allergic amoxicillin rash (flat, pink, non-itchy) is common and not dangerous. However, hives, facial swelling, or difficulty breathing indicate a true allergic reaction requiring immediate medical attention.

This calculator is designed for pediatric weight-based dosing. Adult amoxicillin doses are typically fixed: 500 mg every 8 hours or 875 mg every 12 hours for most infections, regardless of weight. For adults, the standard dose is 1,500 mg/day for mild infections and 2,625 mg/day for more severe infections.

Yes, the Amoxicillin Dosage Calculator is fully embeddable. Tap "Embed" above to configure appearance and copy the code. It is free to use, works on any platform (HTML, WordPress, CMS), and adjusts to any screen size automatically. Visit calculory.com/services/embed-calculators for the complete guide.