Adds up is a commonly used phrase to convey the idea that a situation or information makes sense or is logical. There are several synonyms for adds up, including compute, calculate, evaluate, reckon, and tally. These words essentially mean the same thing, but might be used in different contexts. Compute and calculate emphasize the use of math or formulas, while reckon and evaluate can imply a more subjective analysis. Tally tends to be used when discussing numbers that are being added together. Overall, these synonyms can be used interchangeably with adds up, but understanding their subtle differences can help writers and speakers better convey their intended message.