Ability to use a calculator when entering bill
When entering a bill, it would be handy if there's a quick plus button there so that I can add multiple items fast and easy.
Currently there's an empty button on the number pad that shows up which I think could very well be used for simple plus/minus calculations.
We just added a very basic calculator function to our web app, so you can now use basic mathematical operations when entering a cost (addition, subtraction, multiplication, and division). We hope to add similar features to our mobile apps at some point in the future!
I'd also love to see basic math operations available in the number fields.
Simão Martins commented
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.
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.