NURS 2111 Nursing Care - Women and Children Math Formulas 2022.

Math Formulas:



1. Use formula #1 when converting from one system of measurement to another system of
measurement (i.e., mg=mcg)

Desire to Change x Other Half of Conversion = Desired Conversion
Matching Conversion

2. Use formula #2 when calculating the volume (i.e., tablets, capsules, caplets, ml, etc.) of a
medication to be given to a patient.

Doctor’s Order x Volume = Volume To Be Given
On Hand

3. Use formula #3 when calculating the rate of an IV pump and you have available a volume (ml)
and time in hours.

Volume (ml) = ml/hr
Time (hrs)

4. Use formula #4 when calculating the rate of an IV pump and you have available a volume (ml)
and time in minutes.

60 x Volume (ml)= ml/hr
Time (minutes)

5. Use formula #5 when calculating the rate of an IV order to be infused by gravity (No Pump).

Volume (ml) x drop factor (gtts/ml) = gtts/min
Time (minutes)

6. Use formula #2 tweaked version when calculating strength/time (i.e., mg/hr, mcg/min,
mg/kg/hr) of medication to be given to a patient. This will be given on an IV pump.

Strength/time x Volume = ml\hr
On Hand


Rounding Rules:

1. When converting pounds to kilograms, round to hundredths.



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