• Volume/Solid
    K'zayit is variously defined as being the volume of 1/3, ½, or 1 whole egg; 0.6 - 1.9 fl. oz. (18-56 ml), depending on the application.
    Note For d'oraita requirements such as seder, we are stringent (machmir) and use the larger amount of 1.9 fl. oz. (56 ml). For d'rabanan rules, we are more lenient and use only 1.3 fl. oz. (39 ml, or 1/6 cup).
    • K'zayit for Seder Matza and Afikoman1.9 fl. oz. (56 ml) of matza.
    • K'zayit for Bracha Achrona and Birkat HaMazon: 1.3 fl. oz. (39 ml, or 1/6 cup) of solid food.

    Beitza, K'Beitza

    Beitza, K'Beitza = 1.9 fl. oz. (56 ml); an egg size by definition.

    Note For an etrog, which must be at least 1 egg volume, today we use a minimum of 2 egg volumes.