Three months ago, I got fed up with my phone app. It wanted permissions, it wanted cloud sync, it wanted to sell me a premium subscription to see my own data. So I did what any reasonable software engineer would do: I opened Google Sheets and built my own tracker. It took twenty minutes. It has no animations, no push notifications, and no "engagement loops." It's just rows and columns. And honestly? It's the best weight tracking system I've ever used.
My spreadsheet has five columns: Date, Weight (lbs), BMI, Notes, and Trend. The Date column is obvious. Weight is whatever the scale says that morning. BMI auto-calculates from a formula I plugged in on day one. Notes is where I write things like "ate pizza late" or "dehydrated from hike." And Trend is a seven-day rolling average that smooths out the noise.
The magic is in the Trend column. Raw weight bounces around like a caffeinated squirrel. Monday I'm 174. Tuesday I'm 176. Wednesday I'm 173. If I only looked at the daily number, I'd lose my mind. But the seven-day average moves slowly and predictably. When the trend line drifts upward for two weeks straight, I know something needs to change. When it holds steady, I know I'm maintaining. That single smoothed number is worth more than a hundred raw data points.
The spreadsheet has evolved over time. I added a "Notes" column after I noticed patterns I couldn't explain. "Ate Thai food last night" would predict a two-pound spike the next morning — sodium bloat. "Had three beers" meant a guaranteed Monday rebound. "Traveled to Phoenix" always showed up as a drop, probably dehydration from the dry air. The notes turned raw numbers into a story.
I also added a "Delta" column that shows the week-over-week change in the trend line. Not the raw weight change — the trend change. That's the number that actually matters. A delta of -0.3 pounds per week means I'm on track. A delta of +0.1 for three weeks means I need to tighten something up. It's early warning, not panic mode.
My favorite feature is the conditional formatting I mentioned earlier, but I should explain how it works. The trend column uses a formula that checks the last five entries. If all five are higher than the five before them, the cell turns red. If three out of five are higher, it turns yellow. If the trend is flat or down, it stays white. It's a visual alarm system that requires zero mental math. I open the spreadsheet on Sunday morning, scan the colors, and know immediately whether I'm drifting.
I've tried exporting the data to more sophisticated tools — Tableau, Python scripts, even a custom dashboard I built one weekend. They were all overkill. The spreadsheet does exactly what I need: store data, calculate trends, and warn me when things go wrong. Anything more is procrastination disguised as productivity.
I also added conditional formatting. If the trend goes up for five consecutive days, the cell turns yellow. If it goes up for ten, it turns red. It's a stupid-simple visual signal that cuts through all the mental gymnastics of "maybe it's water weight" or "maybe the scale was off." The spreadsheet doesn't care about my excuses. It just colors the cell and stares at me.
Every Sunday morning, I spend five minutes updating the sheet, then I look at the weekly chart I built. The chart isn't fancy — just a line graph with two series: raw weight and trend. But seeing them side by side is genuinely useful. The raw line is jagged and emotional. The trend line is calm and honest. I need both, but I trust the trend.
The best part? I own the data. It's in my Google Drive, exportable as CSV, and if Google disappears tomorrow, I'll download it in thirty seconds. No vendor lock-in. No "your account has been suspended" nightmares. Just a spreadsheet that does exactly what I need and nothing else.
I've shared the template with three friends now. Two of them actually use it. The third said it was "too minimalist" and went back to his app. Fair enough. But for me, the lack of features is the feature. I don't need gamification. I need a number that tells me if I'm drifting.
One thing I didn't expect was how the spreadsheet changed my relationship with failure. Before, a bad week felt like a personal failing. Now I can look at the data and see exactly what happened. "Oh, I averaged 2,600 calories that week because of two social dinners." The numbers remove the shame. They turn subjective feelings into objective facts. And facts are easier to fix than feelings.
I've also started using the spreadsheet to plan ahead. If I know I have a big dinner coming up on Saturday, I'll eat lighter on Thursday and Friday. I can model the impact in the spreadsheet before it happens. "If I eat 1,800 calories Thursday and Friday, I can eat 3,000 on Saturday and still average 2,200 for the week." It's like budgeting, but for food. The math is simple. The discipline is hard.
Do you track your weight in an app, a spreadsheet, or not at all?
The spreadsheet has outlasted every app I've ever tried. Apps get acquired and shut down. They change their pricing. They redesign their interface and break your workflow. A spreadsheet is just a file. It will still open in twenty years. That permanence matters when you're building a dataset that spans months or years. I don't want my health history trapped in someone else's business model.