A pefsu measures the strength of the beer made from a heqat of grain pefsu = number loaves of bread (or jugs of beer) number of heqats of grain . {\displaystyle {\mbox{pefsu}}={\frac {\mbox{number loaves of bread (or jugs of beer)}}{\mbox{number of heqats of grain}}}.} A higher pefsu number means weaker bread or beer.
En pefsu måler styrken på en ] lavet fra en heqat af korn pefsu = antal stykker brød (eller kander øl) antal heqats korn {\displaystyle {\mbox{pefsu}}={\frac {\mbox{antal stykker brød (eller kander øl)}}{\mbox{antal heqats korn}}}} Et højere pefsu-nummer betyder svagere brød eller øl.