These days you should use Splitwise: https://www.splitwise.com/ https://www.splitwise.com/ (Not affiliated, just a happy user. And there's a nice network effec

These days you should use Splitwise: https://www.splitwise.com/ https://www.splitwise.com/ (Not affiliated, just a happy user. And there's a nice network effect if more people use it, so more people should use it.)