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💊 Dosage & Calculations

The med-math that trips everyone up — made visual. Type the order, watch the answer and the worked steps. Then hit Practice for endless problems. Learning tool — always double-check against your facility's policy.

Tablets / liquid IV drip rate (gtt/min) IV pump (mL/hr) Weight-based (mg/kg) Convert units
Answer
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The formulas (memorize these three)

Tablets / liquid

Amount = (Desired ÷ Have) × Quantity

"Want over have, times what it's in."

IV drip rate

gtt/min = (Volume × Drop factor) ÷ Time (min)

Drop factor is on the tubing box (10, 15, 20, or 60 gtt/mL).

IV pump rate

mL/hr = Volume (mL) ÷ Time (hr)

For an electronic pump.

Weight-based

Dose = mg/kg × weight (kg)

Then check it's a safe amount, and divide by doses/day if needed.