Reference
Dosage calculation formulas
Every formula you need, each with its variables and a worked example. For the reasoning behind them - how to set a calculation up so the units cancel - read the dosage calculation guides.
Desired over Have (D/H × Q)Amount to give = (D ÷ H) × QIV drip rate (gtt/min)gtt/min = (Volume × Drop factor) ÷ Time (min)IV flow rate (mL/hr)mL/hr = Volume (mL) ÷ Time (hr)Infusion timeTime (hr) = Volume (mL) ÷ Rate (mL/hr)Pounds to kilogramsWeight (kg) = Weight (lb) ÷ 2.2Milligrams and micrograms1 mg = 1000 mcgmcg/kg/min to mL/hrmL/hr = (mcg/kg/min × kg × 60) ÷ Concentration (mcg/mL)Weight-based dose (mg/kg)Dose = Weight (kg) × ordered (mg/kg)