You are going on a trip, and there are two equally enticing options: miles or cash. Redeem your 30,000 miles for the flight or pay $420 in cash. The other part says, "Do the math," while the travel bug just wants to press "book now." If the above sounds familiar, you are not alone. Determining whether to use those hard-earned miles or to simply pay cash for a flight can be as tedious as a Sudoku puzzle solved during a red eye. The miles or cash calculator was thus created. This nifty little tool ensures that you redeem miles wisely—and may also save some miles for when the value truly counts. Let’s break it down so you can book with confidence (and a little technical swagger). What Is a Miles or Cash Calculator—And Why Use One? At its core, a miles or cash calculator helps you answer the age-old traveler's question: Which gives me better value—redeeming miles or paying cash? It’s designed to take the guesswork out of travel hacking and back your booking d...