Every body has a size and mass that distinguishes it from others and makes it different from others. Some of these bodies are huge and large in size, and some are small and light in weight. Among these masses and bodies are some that are dealt with by their size and weight, each according to its quantity, weight, and cheapness. This is why they created quantities by which these weights and quantities could be estimated, so they used measures and weights for that. Objectives: The research aims to know some measures and weights, such as the wife’s maintenance, the amount of zakat, etc.I found it to be a widely spread topic, and widely used in the folds of jurisprudence. During my reading of jurisprudence books, I found jurists using many quantities, of multiple types, and different forms, according to the type of each quantity. methodology: I begin by mentioning the title and the definition in its language and terminology, and the basis of the issue from a verse or hadith, then I arrange the opinions, starting with the first, then the next, then the next, and I make the statement that seems to me closest to the truth - according to what I have arrived at - in the last. I have attributed the Qur’anic verses to their surahs, and the noble hadiths to their original sources as much as I can. If I do not find it, I indicate the place from which I took it. Results: Conclusion: Jurisprudential theories are a new method of writing, and a new method of classification, created by contemporary scholars. They composed several theories, with multiple topics, according to each theory and its details. The theory of magnitude is a theory that includes the origins of the particulars of quantities, in its spread within the various sections of jurisprudence.