When it comes to finding alternative phrases for "sum up to," there are several options to choose from. One possible synonym is to "total up," which essentially means to arrive at the final sum or amount of something. Another way to convey the same idea is to say something "amounts to" a certain figure. "Add up to" is also a commonly used phrase that means the same thing as "sum up to." Finally, one might also say that something "comes to" a particular amount, which is yet another synonym for "sum up to." Whether you choose to use one of these phrases or a different one, these synonyms can help to add variety and nuance to your writing.