Dosage CalculationHESI A2 cheat sheet

Desired over have

7 key facts Reviewed Oct 2026

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The Formula

(Desired / Have) × Quantity = amount to give
Ordered 500 mg, have 250 mg per tablet → (500/250) × 1 = 2 tablets

Liquids

Quantity is the volume the supply comes in
Ordered 75 mg, have 25 mg/mL → (75/25) × 1 mL = 3 mL

Weight-Based

Convert pounds to kilograms first (÷ 2.2)
Multiply dose per kg by the patient's weight

Safety

Units must match before dividing; sanity-check the size of the answer

Key takeaway

Desired over have

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