NAPL
A LITTLE LIGHTBULB MOMENT
Pharmaceutical calculations and dimensional analysis
Milligrams and grams are a thousand apart
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A gram is a suitcase; a milligram is a grain of sand.
The idea behind the cue
To convert mg to g, divide by 1,000. To convert g to mg, multiply by 1,000. The decimal shift is the same as moving three places because milli means one-thousandth.
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Short & simple
A gram is a suitcase; a milligram is a grain of sand.
Acronym
MG — Mustached Goats.
Story
A label says 750 mg. The calculator wears a tiny hard hat and shifts the decimal three places left to make grams. The robot refuses to move the decimal by vibes and checks every step.
Connect the pieces
- M (Mustached) → Milli: Milli means one-thousandth, so mg to g divide by 1,000.
- G (Goats) → Gram: Going from g to mg, multiply by 1,000.
- Mustached · Milli: Milli means one-thousandth, so mg to g divide by 1,000.
- Goats · Gram: Going from g to mg, multiply by 1,000.
Know the limits
This rule is for metric mass only; it does not apply to volume units like mL.
Further reading · OpenStax Pharmacology for Nurses · foundational mechanisms ↗Check your understanding
A formulation requires 750 mg of an ingredient. Enter this mass in grams.
Reveal explanation
0.75 g (tolerance ±0)
750 mg ÷ 1,000 = 0.75 g.
Further reading · OpenStax Pharmacology for Nurses · foundational mechanisms ↗