this would definitely be useful. I find myself in need of subtraction most often, if I pay a grocery bill but there are personal items that I don't want to charge to my roommate.

well !

In certain cases while splitting the bills, there is a need for using calculator. Say if I want to split a bill unequally between A and B. In the column where I enter A's amount, if I could to add different expenses applicable to A and if it automatically shows the total , it would be good. ( For example, say I enter 230 + 45 + 100 in the box provided and if it shows the total 375 , it would be good.). Otherwise I have to use external calculator to do this .

This would make me come over from "Settle up"

Just came to suggest this feature. Would be greatly useful.

Adding a calculator would be nice, I use it when itemizing stuff and tacking on the individual tax.

Would be amazing for the "adjustment" method as well !
Right now it's clunky at best whenever I need to quickly add multiple items without a calculator.

Yep, definitely need that one!

This would be more useful if it can allow selection of multiple categories per bill.

I'd also love to see basic math operations available in the number fields.

I would go one step further: whenever there is a number field, that number field should accept not only numbers but some basic math operations. For example: if you entered (4.6+2.53)*1.23 in the field, when that field loses focus it would update itself to 8.77.

Have a look at http://mathjs.org/ or http://silentmatt.com/javascript-expression-evaluator/ to get you started in the webapp implementation of this feature.

I want this feature as well. This might not seem like a great feature but this is cool and helps the end user a lot. When I have to take out items that only belongs to me or when I enter itemized bills, I miss this feature so much. Just + and - should be a good start. * and / will need a little thinking because of operator precedence.