Ten years ago I was a jobless student in Osaka. I was almost broke but I still wanted to go to Japanese-Korean BBQ joints and bars, so I had to come up with a solution to give myself personal allowances on a consistent basis.
I set up an Excel spreadsheet where I had cells for each day of the month that would be filled with daily subtotals. I also wanted to set up weekly budgets (mostly because I needed the extra money for weekend parties) so I appended a column that automatically calculated and showed the amount of money I had saved, or exceeded, relative to the weekly budget. I figured the most realistic way would be to start tracking every single expense because then I’d know exactly how much I was spending, and I could more accurately predict the weekly results.