How to track habits in a spreadsheet (and when to stop)

Plenty of people track habits in a spreadsheet and never need anything else. It costs nothing, it does exactly what you tell it, and the data is yours in a format that will still open in twenty years. If you already live in a spreadsheet all day, this is a genuinely good answer.

It has two failure modes though, and both are about friction rather than features. The first is entry: logging a habit means unlocking a phone, opening an app, finding the file, waiting for it to sync, scrolling to today’s row, and typing. That is fifteen seconds against one tap, and fifteen seconds is enough to lose the evening entries. The second is the maths. Streaks, rolling completion rates and weekday bias are all doable with formulas, and all of them break the first time you insert a row in the wrong place.

This guide gives a layout that survives both problems for as long as possible. One row per day, one column per habit, values rather than ticks, and a small block of formulas that does streaks and rates without array gymnastics. There is a downloadable template at the end, plus the export format you will want if you eventually move to an app.

It also says plainly where the spreadsheet stops being the right tool.

Outline

Status: outline. The introduction above is finished copy. Everything below is the section plan for the full draft, targeted at about 1 700 words.

1. The layout that scales. One row per day, one column per habit, and why long format beats a calendar grid.
2. Values, not ticks. Storing 20 rather than TRUE, so the same sheet answers “how much” later.
3. Streak and rate formulas. Four formulas, written out, that survive inserted rows.
4. Conditional formatting as a heatmap. Getting the year view without a chart library.
5. Making entry survivable. Shortcuts, a mobile form, and the one-tap widget trick.
6. When to stop. The four signals that mean the sheet is now costing you more than it returns.
7. Exporting to an app. The CSV shape most trackers accept, and how to reshape the sheet into it.