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Splitting grocery costs fairly is one of the most common sources of friction between roommates, but a few simple habits can prevent most disputes. First, decide upfront whether you are buying groceries together as a shared pool or keeping purchases separate and only splitting specific shared items, such as dish soap, paper towels, or condiments everyone uses. Many roommates find it easiest to use a shared expense app, which lets each person log what they bought and automatically calculates who owes whom at the end of the month. Take a photo of each grocery receipt and upload it immediately, since relying on memory later almost always leads to disagreements about what was purchased or how much it cost. Agree in advance on how to handle food one roommate buys only for themselves, such as specific snacks or specialty items, since these should generally not be split. It also helps to set a rough monthly budget for shared items so no one feels blindsided by an unusually expensive grocery run. Finally, settle up on a fixed schedule, such as the first of every month, rather than letting small amounts pile up, which tends to make the final total feel larger and more contentious than it actually is.