Almost every messy spreadsheet started as a clean one. The difference between the two is structure.
Three layers, always
Every sheet in the file belongs to one of three layers:
- Input — raw data, forms, imports
- Logic — clean tables, calculations, joins
- Output — dashboards, reports, printable views
Data flows in one direction: input to logic to output. Nothing writes back the other way. That single rule prevents most of the confusion that grows over time.
Name things like a developer
Tabs, ranges, and named ranges should read like variables: raw_leads, clean_leads, report_pipeline. Prefixes make it obvious which layer a sheet belongs to, and named ranges make formulas readable.
Keep formulas in one column
If a calculation is repeated on every row, write it once at the top and let it fill down with ARRAYFORMULA or a header formula. This is faster, more reliable, and easier to change.
Delete more than you keep
The best cleanup habit is deleting tabs, columns, and helper cells that no one uses anymore. A small, clear sheet ages better than a big, complete one.
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