Description

When adding an expense in my group, I sometimes have to sum individual items from a receipt. I usually type the numbers on a calculator, but I don't always have the calculator with me, and it can be quite inconvenient

Suggestion

What would be awesome is some basic math handling in the "Amount" field itself.

Example

Input: The users types "0.75 + 1.65 * 2" in the Amount field when adding an expense.
Output: When clicking Save the amount is calculated. An error is returned if the formula is incorrect, or possibly the button Save is greyed out with an error text box.

Optional

• Show the evaluation of the calculation near the Amount field (right to it)
• Parenthesis support, or basically all the basic scientific programming syntax (e.g. Python).
• Preserving the formula string to be able to modify it later: such that I stays visible in the Amount field.