Calculations and formulas for daily practice

Nurses General Nursing


Hi All,

Aside from medication dosage calculations.. what are the most useful formulas/calculations used by nurses on a routine/not so routine basis?

I want to brush up on my nursing math (because you can't always count on that monitor) before I start consolidation this year.



88 Posts

if i were you, i'll try learning dimensional analysis, i.e. if you haven't done so, because studies have shown that this process increases the accuracy of any calculations particulary dosage calc. i get irk a lot when nursing students use the many step process when doing their dosage calculations. for me, this is prone to many errors. that's the reason i prefer one huge equation which ties all the pertinent information given to solve a particular problem. by doing so also helps in critical thinking and logic.


44 Posts

Specializes in Adult ICU (All over), NICU, Education.

MAP=sbp+2 (DBP)/3

Specializes in Hospital Education Coordinator.

converting Celsius to Farenheit or vice versa

A lot of conversion tables are on facility computers for handy access


34 Posts

There are several great books like "Math for Nurses" or "Doseage Calculations". Nursing math is not as hard as it seems. There are only a few formulas and once u got -'em-that's it. These two books go over all the different formulas u need. College algebra was more complicated than nursing math.

Specializes in ER; HBOT- lots others.

n/h *ml


88 Posts

MAP=sbp+2 (DBP)/3

be very careful, i don't mean to nitpick but writing the mathematical equation for mean arterial pressure (MAP) above

as MAP = sbp (systolic blood pressure) + 2 dbp (diastolic blood pressure)/3 is mathematically wrong.

it ought to be MAP = (SBP + 2 DBP)/3, which denotes that SBP is also divided by three and not just twice DBP.

and pls define all parameters so as not to be confusing.


10 Posts

I am in pharmacology now. What does n/h stand for? Thanks!! Luv this website!!!!!:thankya:

Specializes in ER; HBOT- lots others.

need over have times ml.



i use this all th etime!!

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