Conversion Factors and Equivalencies

Sometimes it is necessary to convert before one can calculate a problem.

Tip:

Memorize, memorize equivalencies.
When using the metric system, remember the rules for moving the decimal.
If you know one equivalent within a system, then you can use ratio and proportion to solve conversions.
The ideal is to avoid the apothecary system. The metric system is the ideal system for measurements.
 
1 kilogram (kg) 2.2 pounds (lb)
1 pound (lb) 453.6 grams (g or gm) (use 454)
1 kilogram (kg) 1000 grams (g or gm)
1 gram (g or gm) 1000 mg (milligrams)
1 milligram (mg) 1000 micrograms (mcg, but should always be written out to avoid transcription errors)
1 gram (gm) 1 ml (milliliter) [Preferred term]
1 cc (cubic centimeter) 1 ml (milliliter) 
1 inch (in) 2.54 cm (centimeters)
1 grain (gr) 60 mg (milligrams)
1 (household) cup 240 ml (milliliter)
8 ounces (oz) 1 (measuring) cup
16 ounces (oz) 1 pint (pt)
1 ounce (oz) 30 ml (milliliter)
1 teaspoon (tsp) 5 ml (milliliter)  (not 4-5)
1 dram 4 ml (milliliter) [archaic use]
1 tablespoon ( T or tbs) 15 ml (milliliter)
2 tablespoons (T or tbs) 1 Ounce 
3 teaspoons (tsp) 1 tablespoon ( T or tbs)
1 teaspoon (tsp) 75 gtt (drops)
1 milliliter (ml) 16 minims  (not 15-16)
1 milliliter (ml) 15 gtt (drops)
1 liter (L) 1000 ml (milliliter)
37.0 ° C (Centigrade degrees) 98.6° F (Fahrenheit degrees)

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