Student Resources: Nursing Math
by VickyRN Asst. Admin
Whether administering medications or hanging IV drips, nurses must accurately perform dosage calculations. Some excellent online resources are listed here, to help the struggling nursing student.
 46 Published Nov 1, '09whether administering medications or hanging iv drips, nurses must accurately perform dosage calculations. this is a critical factor for patient safety, as a patient's life may depend on it.
nursing math requires a working knowledge of ratioproportion and/or dimensional analysis. most of these type calculations are at the 6th or 7th grade level, involving addition, subtraction, multiplication, division, and decimals/ fractions. memorizing the most common conversion factors and knowing how to use them (such as converting kilograms to pounds or centimeters to inches) is essential. instructor specifications for rounding (whether to the tenth or hundredths) should be carefully clarified by the student prior to taking any dosage calculation examination.
this is an excellent nursing math resource from delmar publishers:
3 – 2 – 1 calc! comprehensive dosage calculations online it includes extensive internet tutorials and resources. it presents the material from both the ratioproportion and dimensional analysis perspectives.
free internet nursing math resources:
free dosage calculation study ware from delmar publishing (interactive  great study tool!)
unc school of nursing tutorials (metric conversions, tablet dosage calculations, fluid dosage calculations, iv flow rate calculations)
conversion factors (centimeters to inches, etc.)
manuel’s web nursing calculators – you can use this handy tool to double check your own calculations.
dimensional analysis
medication math for the nursing student – uses dimensional analysis
dosage help – a very useful tutorial for practicing dosage calculations
dosages quizzes from prentice hall! (at the completion of each quiz section you may submit your answers to receive an instant score of your results.)
chapter 1: review of arithmetic for medical dosage calculations
chapter 2: safe and accurate drug administration
chapter 3: dimensional analysis
chapter 4: systems of measurement for dosage calculations
chapter 5: converting from one system of measurement to another
chapter 6: calculating oral medications doses
chapter 7: syringes
chapter 8: preparation of solutions
chapter 9: parenteral medications
chapter 10: calculating flow rates and durations of enternal and intravenous infusions
chapter 11: calculating flow rates for intravenous medications
chapter 12: calculating pediatric dosages
comprehensive selftest
Last edit by VickyRN on Jan 3, '12 : Reason: update resource Read more articles from VickyRN

About VickyRN
VickyRN is a certified nurse educator (NLN) and certified gerontology nurse (ANCC). Her research interests include: the special health and social needs of the vulnerable older adult population; registered nurse staffing and resident outcomes in intermediate care nursing facilities; and, innovations in avoiding institutionalization of frail elderly clients by providing longterm care services and supports in the community. She is faculty in a large baccalaureate nursing program in North Carolina.
VickyRN joined Mar '01  from 'Under the shadow of His wings...'. VickyRN has '16' year(s) of experience and specializes in 'Gerontological, cardiac, medsurg, peds'. Posts: 12,030 Likes: 6,322; Learn more about VickyRN by visiting their allnursesPage
 4Nov 11, '09 by Daly City RN>>>>>>>>>>>>>>>>>>>>>>>
A newgrad orientee was to give an I.V. heparin drip to one of her patients. She calculated the I.V. rate incorrectly. The orientee asked the charge nurse to countercheck her drug calculation. The charge nurse was too busy to do an independent drug calculation and just looked at the orientee's drug calculation and said something like, "It looks o.k. to me." This was a sentinel event and it was very scary to say the least. I am very thankful that it did not happen in our unit.
I do drug calculations to keep my mind sharp and also not to forget the formulas, but I also quickly log on to a web site that has drug calculations to verify my math. I'm sure in many U.S. hospitals, independent countercheckings are required for drug calculations of critical medications and also in programming I.V. pumps with critical meds.
At the risk of being repetitive: Just remember to do INDEPENDENT drug calculation and INDEPENDENT countercheck, or do INDEPENDENT programming and INDEPENDENT counterchecking of already programmed I.V. pump for a critical medication, whatever the case may be.
>>>>>>>>>>>>>>>>>>>>>>>  6Nov 12, '09 by Juneau07Thank you so much for those math resources. I am wondering why as a prerequisite to nursing in the state of California that Intermediate Algebra is the requirement. I have been through almost 2 years of math for nursing and not "once" has anything been taught to me regarding calculations of dosages etc.
In some states, the nursing school requirements are specific to nursing and I think this is the answer. When my husband went to get his MBA he took Business Math. Why are nurses not being taught math for nursing exclusively?? My math skills are not so great but taking College Algebra, Trigonometry or Calculus is not going to fix this. Graphing a hyperbola and functions doesn't teach me a thing about IV drips and so on.
State Boards of Nursing need to look in to this and change the curriculum so that we have nurses that are capable to performing these duties accurately.
Thanks Again!  0Jan 8, '10 by IwantobeanurseThank you for this post. I am taking clinical computaion this spring and will use your post as part of my study materials.
 0Feb 27, '10 by sallypzThank you for the Math resources. This is my first semester teaching a LPN Clinical. My students just took the first of 8 dosage calculation quizzes in clinical. Using Dimensional Analysis is part of the quizzes. Most students did well, but there are a few that had problems. I will pass the resources along to them all.
sallypz/MoxieMe  0Jan 27, '11 by clinicalteachThank you so much for posting these links! My students who aren't faring so well, would be remiss not to use the resources you've put up to aid in their studies at home. So Thank you!
 0Feb 1, '11 by nycNurse2bVicki,
May I ask a somewhat related question?
I have no problems with calculations. I maintained a 100 avg in all my calculation courses.
My question is  
I have a patient on D5W, let's say. It is not hanging on a pump and the dial on the tubing is set to 60 as the orders are for D5W @ 60cc/hr.
I go in 1 hour later to hang IVPB Cefepime. Order: 100ml over 30 mins. The drop factor ion the secondary tubing is 15gtt. I spike, prime, connect and hang the bag. Lower the primary bag.
I don't touch the dial on the primary tubing (leave the dial set to 60cc/hr) and I go ahead and open the roller clamp on my secondary tubing and count my drips to get 50 drops per minute.
This way the Cefpime runs at 50 gtt/min and when the bag is empty my primary will run at 60cc/hr.
IS THIS CORRECT? My school focused so much on the calculating art and not so much on the actual IVhanging part! MANY THANKS.