Intermittent fasting templates exist because keeping it all in your head is a terrible idea
I spent years tracking fasting windows on paper calendars before someone at work shared a spreadsheet that changed how I approach this. The Vintage Intermittent Fasting Template is basically a pre-built tracking system modeled after older spreadsheet designs that prioritized simplicity over fancy conditional formatting. You don't need anything complicated. You need something that actually survives being opened months later when your Excel has been updated four times and every macro is broken. The core structure is deceptively simple. A fasting window calculator sits in the top section where you enter your chosen eating window—most people start with 16:8 or 18:6—and it computes your daily fast start and end times automatically. Below that is a rolling weekly log where you track what you actually ate versus what you planned to eat. The difference between the two columns is where people usually find their problems. I built mine around a three-column weekly layout. Column one is the scheduled window. Column two is the actual window. Column three is the variance in minutes. At first I thought the variance column was useless, but after about six weeks of data it revealed something I completely missed: my adherence dropped consistently on Wednesdays because that's when I had a standing lunch meeting I forgot to factor into my planning. That single insight cut my weekly violations from about five per week down to two by simply rescheduling meetings to fall outside my fast.
The template uses basic formulas only. No VBA, no Power Query, no dependencies that break when you open the file on a different version of Office. The fasting window calculation references a static settings cell so you can change your protocol without rewriting anything. There is a running monthly average calculation that shows your compliance percentage at the bottom, which is more useful than most people expect because it catches gradual drift. You do not have to fill in every day, either. Empty cells are treated as missing data rather than zeros, which matters if you sometimes do two fasting days in a row and want to skip tracking both.
Where Beginners Mess This Up
The biggest problem I see is that people use these templates as logging tools when they should be using them as planning tools. Logging what you already did tells you nothing new. The variance column only works if you calculate your plan before the day starts. Fill it in after dinner and you are just documenting failure instead of preventing it. Another issue is the timezone trap. If you travel or your work hours shift significantly across seasons, your fasting window moves relative to your local clock. I ran into this when I switched to a night shift for three months. My original template locked the eating window to a fixed time, so by the end of week two I was eating at 3 AM local time and wondering why my energy was shot. The workaround was straightforward: add a timezone offset field to the settings section and recalculate the window based on your actual local time each day. Takes about two minutes to set up and prevents a month of confused tracking. There is also a subtle bug with how some versions handle meal timing. If you eat within your window but at the very edge—say your window ends at 8 PM and you take a bite at 7:59 PM—the template might flag it as a violation depending on how the boundary condition is coded. I found this when my compliance numbers were inexplicably lower than my memory. The fix is checking whether the template uses strict less-than or less-than-or-equal comparisons on the end time. If it is strict, shift your scheduled end time ten minutes earlier as a buffer.
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What This Template Cannot Do
It will not sync with your phone. It will not send reminders. It will not integrate with AnyList or connect to Apple Health or do anything other than sit in a spreadsheet and show you numbers. If you need automation, you are looking at a different class of tool entirely. The tradeoff is that what you lose in convenience you gain in reliability. I have had this template work across three computers, two operating systems, and one spilled coffee incident. My phone app did not survive a single software update. The other limitation is that it assumes a single consistent protocol. If you rotate between 16:8, 18:6, and occasional 20:4 days, you will spend more time adjusting the template than you save by using it. In that case, a simple bullet journal with date stamps is faster and less frustrating. I know because I tried the template during a rotation phase and quit after eleven days.
Getting Started Without Overthinking It
Open the template. Fill in the settings section with your current protocol. Set up the first week in the planning section before Monday starts. Track your actual window each evening and let the variance column do the work. Review the monthly average at the end of each period. Adjust your schedule based on what the data shows rather than what you think is happening. That is the entire process. The template does not get easier after you learn it because it was already simple. What gets easier is seeing the patterns you were blind to. If you want the file itself, search for the Vintage Intermittent Fasting Template on standard spreadsheet forums. Most copies circulate as Google Sheets links, and a few are available as Excel .xlsx files. Pick whichever format you are most comfortable working in. The logic is identical between them and there are no platform-specific features you need.
