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15 grains = 1 gram
3 tsp = 1/2 oz
1 tbsp= 1/2 oz
1 quart=32 oz or 2 pints
1/2 pint = 8 oz = 1 cup
2 tbsp=1 oz
1 pint= 16 oz
3 tsp=1tsp
6 tsp=1 oz
1 cup (c)=
8 ounces (oz)
1 pint (pt)=
2 cups (c)=
16 ounces (oz)
1tablespoon(T, TBS)=
3 teaspoons(t,tsp)
2tablespoons(T, Tbs)=
6teaspoons(t, tsp)
In the househould system=
1(T, TBS)=3(t,tsp)
1 quart (q)=
2 pints (pt)=
4 cups (c)=
32 ounces (oz)
to convert mg to grams you divide it by 1000. example 100 mg would be 0.1 grams. to convert mcg to mg you also divide by 1000. so 50 mcg would be 0.05 mg.
3 tsp=1 tbsp
Ratio-Proportion Method
Problem:The Dr ordered 300mg. the dose on hand is 1000mg/ml. How many ml would you give?
1000ml = 300mg
30ml        xml


x=9000/1000        x=9ml
1(L) liter=1000 mililiters
1(ml) mililiter=1 cubic centimeter
1miligram(mg)=1000micrograms(mcg, ug)
What are the three steps to dosage calculations?
STEP ONE: make sure all measures are in the same sytem and all units are the same size. mg and gm convert mg to gm. ect
STEP TWO: get an approxamate answer in your head before you calculate so you have somewthing to compare your calculation to.
STEP THREE: compute the amount of vehicle you need to administer the prescribed dose
5 ml syringes are measure in 2/10 increments, round accordingly or as directed
3ml syringes are measured in1/10 increments, round anything over 1 ml to nearest 1.10
if you reduce fractions to their lowest common denominator you have smaller numbers to work with
The basic units of the metric system is:
Volume = Liter
Weight = gram
1ml syringes are measured in 1/100, use for anything under 1ml
medicine cups are as follows: 2.5, 5, 7.5, 10, 15, 20, 25 and 30 ml
x of y cards