Over the past few months, we’ve done a lot of research into how to share vacation expenses, thanks to the help of users like you. We posted a detailed survey to recruit respondents from the Splitwise interface. That data enabled us to create a travel calculator that tells you how much each person should pay for an expense based on how many days each person was on the trip. Go check it out! This is all part of our grand strategy to make Splitwise the best travel sharing app on the web.
I also have a new blog post on Forbes describing our data analysis. Read my post there for lots of juicy graphics, conclusions, and economic logic.
The Splitwise Blog 