Weight-Based Tablet Dosage Calculator
Calculate the exact number of tablets needed based on patient weight and mg/kg dosage. Includes a database of 100 common drugs.
About
Medical prescriptions for antibiotics, antiparasitics, and pediatric medications are frequently written in weight-based formats (mg/kg) rather than fixed unit doses. A discrepancy arises when the calculated ideal dose does not align perfectly with commercially available tablet strengths. Under-dosing leads to treatment failure and antimicrobial resistance, while over-dosing increases toxicity risks. This calculator bridges the gap between the therapeutic index and pharmacy inventory.
The logic processes the patient's body mass against the specific coefficient for the selected active ingredient. It then divides the total required mass by the unit strength of the available tablet, rounding according to standard medical protocols. This is particularly critical for medications like Ivermectin or Prednisone, where precise weight correlation determines efficacy.
Formulas
The core calculation determines the Total Daily Dose (TDD) or Single Dose depending on the regimen.
Dosetotal = Weightkg × Ratemg/kg
Tablets = DosetotalStrengthpill
If the input weight is in pounds (lbs), it is first converted: kg = lbs ÷ 2.2046.
Reference Data
| Drug Name | Standard Dose (mg/kg) | Common Tablet Strength | Adult Max Dose |
|---|---|---|---|
| Amoxicillin | 20-40 | 500 mg | 3000 mg |
| Azithromycin | 10 | 250 mg | 500 mg |
| Ivermectin | 0.2 | 3 mg | Variable |
| Prednisone | 0.5-2.0 | 5, 10, 20 mg | 60 mg |
| Ibuprofen (Ped) | 10 | 100 mg | 40 mg/kg |
| Acetaminophen | 10-15 | 325, 500 mg | 4000 mg |
| Metronidazole | 7.5 | 250, 500 mg | 4000 mg |
| Fluconazole | 3-6 | 50, 100, 150 mg | Variable |