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!
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Haseeb Haider commented
This would be more useful if it can allow selection of multiple categories per bill.
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Anonymous commented
I'd also love to see basic math operations available in the number fields.
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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.
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.
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Lobo commented
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.