Dosage Calculator
Recommended Single Dose
Infusion Rate
Converted Value
Quick Formula Reference
Weight-Based Dose:
Dose = Weight (kg) x Dose per kg
IV Flow Rate:
ml/hr = Total Volume / Total Hours
Drops per minute:
gtt/min = (Volume x Drop Factor) / (Time in minutes)
mg to mcg: Multiply by 1000
g to mg: Multiply by 1000
mcg to ng: Multiply by 1000
Dose = Weight (kg) x Dose per kg
IV Flow Rate:
ml/hr = Total Volume / Total Hours
Drops per minute:
gtt/min = (Volume x Drop Factor) / (Time in minutes)
mg to mcg: Multiply by 1000
g to mg: Multiply by 1000
mcg to ng: Multiply by 1000
Safety Checklist
- Right patient identification
- Right medication verified
- Right dose calculated
- Right route confirmed
- Right time documented
- Allergies checked
Common Drug Dosage Reference
Quick reference for commonly prescribed medications. Always verify with BNF and local protocols.
| Drug | Adult Dose | Pediatric Dose | Route | Max Dose | Notes |
|---|---|---|---|---|---|
| Paracetamol | 0.5-1g q4-6h | 10-15 mg/kg q4-6h | PO/IV/PR | 4g/day | Reduce in hepatic impairment |
| Ibuprofen | 200-400mg q6-8h | 5-10 mg/kg q6-8h | PO | 2.4g/day | Take with food |
| Amoxicillin | 250-500mg tds | 20-40 mg/kg/day div | PO/IV | 4-6g/day | Complete course |
| Metformin | 500mg bd, titrate | N/A | PO | 2g/day | Monitor renal function |
| Amlodipine | 5-10mg od | N/A | PO | 10mg/day | Monitor BP |
| Atorvastatin | 10-80mg od | N/A | PO | 80mg/day | Evening dosing |
| Morphine | 5-10mg q4h PRN | 0.05-0.2 mg/kg | PO/IV/IM/SC | Varies | Monitor respiration |
| Furosemide | 20-40mg od | 0.5-2 mg/kg | PO/IV | Varies | Monitor electrolytes |
| Ondansetron | 4-8mg q8h | 0.15 mg/kg | PO/IV | 32mg/day IV | QT prolongation risk |
| Salbutamol | 2-4mg q6-8h | 0.1-0.2 mg/kg | PO/Inh/IV | 32mg/day PO | Tremor common |
| Omeprazole | 20-40mg od | 0.3-0.7 mg/kg | PO/IV | Varies | Before food |
| Warfarin | Individualised (INR 2-3) | N/A | PO | Varies | Monitor INR regularly |
| Insulin (Actrapid) | Individualised | 0.5-1 units/kg/day | SC/IV | Varies | Monitor glucose |
| Aspirin | 75mg od (cardio) | N/A | PO | Varies | Reye's syndrome in children |
| Prednisolone | 5-60mg/day | 0.5-2 mg/kg/day | PO | Varies | Taper when stopping |