Obtain a volume measured in bushels --- 6 bushels, for example.
Multiply the bushel volume by four to convert to an equivalent volume in pecks. In this example, 6 bushels multiplied by 4 equals 24 pecks.
Check your conversion with an online converter like the one built into Google (see Resources). In the search field, type the number of bushels to be converted followed by the phrase "bushels to pecks." Both the original and converted amounts will appear underneath the search field.