Common conversions
Always convert to the same unit before calculating.
| From | To | Multiply by |
|---|---|---|
| g | mg | 1000 |
| mg | mcg | 1000 |
| kg | g | 1000 |
| L | mL | 1000 |
| lb | kg | ÷ 2.2 |
Desired over have
Dose = (Desired ÷ Have) × Quantity. Example: 250 mg ordered, 500 mg/5 mL on hand gives (250 ÷ 500) × 5 = 2.5 mL.
IV rates
mL/h = total volume (mL) ÷ time (h).
gtt/min = volume (mL) × drop factor (gtt/mL) ÷ time (min). Round drops to the nearest whole drop.
⚠️ Reference only. Always verify against the manufacturer's specs, your jurisdiction's code and your site's procedures.