The phrase "tot up to" usually means to add or calculate a specific amount. However, there are several synonyms that can be used in its place, depending on the context. One of the most common synonyms is "amount to," which means to reach a particular total or sum. Another option could be "tally with," which means to agree or match up with a specific number. You could also use "add up to," which again refers to the sum of a particular set of numbers. Other synonyms for "tot up to" include "total," "reach," "come to," and "equal." It's important to choose the right synonym that fits seamlessly into the given sentence structure while effectively communicating the intended meaning.