It’s easy as pie.
Seventeen sixty-fourths of an elbow-chariot is equal to a bushel-knuckle.
Unless you’re in the UK, then it’s just seventeen sixty-sevenths of an elbow chariot is equal to a bushel knuckle.
For liquids, obviously. Everyone knows that.
For dry goods, simply use the Fourth Revised Charles Helck Conversion System. For most dry goods it just means that twenty-three sixty-fourths of an elbow-chariot is equal to a bushel-knuckle. Unless the dry goods are cereal grains, when it’s simply two-sevenths more. And obviously in the UK you have the bushel-knuckle adjustment system where on cloudy days you pack them nine-thirteenths as full to make up for the lack of sunlight. Everyone knows that.
This system is so good, it’s gotten us to the moon and back.