Study Guide: Unit Conversions
US Common Volume
\begin{align} 60\ grains\ (gtts) &=1\ teaspoon\ (tsp) \\ 3\ teaspoons\ (tsp) &=1\ tablespoon (tbs) \\ 2\ tablespoons\ (tbs) &=1\ once\ (oz) \\ 8\ onces\ (oz) &=1\ cup \\ 2\ cups &=1\ pint \\ 2\ pints\ (pts) &=1\ quart\ (qt) \\ 4\ quarts (qts) &1\ gallon\ (gal) \end{align}
Apothecary
Converting volume to weight. The basic unit of weight is the grain (gr).
\begin{align} 16\ fluid\ oz &=1\ pint\ (pt) \\ 1\ gram\ (gr) &=60\ milligrams\ (mg) \\ 2\ pints\ (pts) &=1\ quart\ (qt) \\ 4\ quarts\ (qts) &=1\ gallon\ (gal) \end{align}
Metric (International)
The basic unit of measurement in metric is the liter. cc and ml can be used interchangeably = gram.
\begin{align} 1\ cc &=1\ mL \\ &= 1\ g \\ 1000\ mL &=1\ L \\ &= 1\ kg \\ 1000\ mcg &=1\ mg \\ 1000\ mg &=1\ g \\ 1000\ g &=1\ kg \\ \end{align}
Metric (International) Units of Length
The basic unit of length in metric is the meter.
\begin{align} 1000\ microns &= 1\ mm \\ 10\ mm &= 1\ cm \\ 1000\ mm &= 1\ m \\ 100\ cm &= 1\ m \\ 1000\ m &= 1\ km \\ \end{align}
Metric Apothecary to US Common
\begin{align} 1\ mg &= 1/60\ gr \\ 60\ mg &= 1\ gr \\ 1\ g &= 15\ gr \\ 4\ g &= 60\ gr \\ 30\ g &= 1\ oz \\ 1\ kg &= 2.2\ lbs \\ \end{align}
Metric to Apothecary to US Common
\begin{align}
\textit{5 mL} &=60\ gtt \\
&=1\ tsp \\
\textit{30 mL} &=1\ oz \\
&=2\ tbs \\
\textit{240 mL} &=8\ oz \\
&=1\ cup \\
\textit{500 mL} &=1\ pt \\
&=1\ pt \\
\textit{1000 mL} &=1\ qt \\
&=1\ qt
\end{align}