How Carbon Evaluates Your Progress at Your Check-In

Carbon doesn't just rely on a single weigh-in or a simple before-and-after comparison. It uses a progressive evaluation method that gets more sophisticated the longer you stay consistent. Each week you check in compliant to your targets, or preset the coach with an adjustable scenario, Carbon builds a clearer, more accurate picture of your true weight trend and uses that data to adjust your targets for the week ahead as needed.

This is the same approach a knowledgeable coach would take: look at patterns over time, not individual data points, and make decisions based on what the trend actually shows. The weekly check-in is where that evaluation happens. Showing up every week and hitting your Carbon-provided targets is what gives the app the data it needs to coach you accurately.

Carbon evaluates your progress using two inputs: your weight data and your tracked intake. At each check-in, Carbon reviews how your weight trended during the week alongside your logged calories and macros relative to your Carbon-provided targets. In some cases, if your tracked intake landed outside your targets but your progress still moved in the right direction, Carbon may adjust your targets to reflect what you were actually eating rather than what was prescribed.

This is why consistent logging matters as much as consistent compliance. Accurate tracked data gives Carbon the full picture it needs to make the right call on your adjustment. For a full breakdown of how the check-in process works and how Carbon uses your tracked data, see Weekly Check-In in Carbon: How It Works and What to Expect.

Carbon's evaluation method gets more accurate the longer your streak of compliant check-ins. Here is how it works at each stage.

In your first compliant week on a new goal, or following a noncompliant check-in, Carbon evaluates your progress by comparing your start and end weight for that week. This establishes a baseline and sets the stage for more detailed evaluations as your data builds.

After two consecutive compliant weeks, Carbon shifts to a more nuanced method. Rather than comparing single data points, it calculates your average daily weight for each week and compares the two weekly averages. This accounts for natural day-to-day weight fluctuations and gives a clearer picture of actual progress than start and end weights alone.

After three or more consecutive compliant weeks, Carbon applies a rolling average across your full weigh-in history. This method smooths out short-term anomalies caused by factors like water retention, dietary variation, and sleep patterns, and surfaces the true underlying trend in your weight data. The longer your streak of consistent check-ins, the more accurate and stable this evaluation becomes.

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Coach Trend Weight takes a different approach to determining your progress by reviewing your full weigh-in history and running it through a predictive algorithm to give you the clearest possible view of your true weight trend. It filters out daily noise and focuses on the future direction your weight is actually moving over time.

This feature is especially useful during weeks where your scale weight feels inconsistent or misleading. Rather than reacting to a single reading, Coach Trend Weight keeps your focus on the bigger picture.

For a full breakdown of how Coach Trend Weight works, see Coach Trend Weight .

After each check-in, Carbon generates a report that goes beyond a simple summary of what changed. The check-in report gives you the full picture of your week and the context behind every adjustment your coach makes.

The report covers three things:

Your updated targets: Your new calorie and macro targets are displayed at the top of the report, along with the net change from your previous targets (if needed). A coaching message explains the reasoning behind the adjustment in plain language, so you understand not just what changed but why.

Your weight and compliance data: The report breaks down your scale change since your last check-in and your average daily intake for the week compared against your Carbon-provided targets. You'll see exactly how your calories and protein tracked relative to what Carbon prescribed, giving you a clear read on your compliance for the period.

Your goal progress: The bottom of the report shows your overall progress toward your goal: your start weight, current weight, goal weight, total loss or gain to date, and your average weekly rate of change. This view keeps your focus on the longer arc of your progress rather than any single week's result.

This level of transparency is intentional. The more context you have around your adjustments, the easier they are to trust and follow through on. Your check-in report history is saved on the Coach tab and can be reviewed at any time.

As a best practice, logging your weight daily gives Carbon more data to work with and produces more accurate evaluations at check-in. The Coach tab includes a weight scale directly in the view, so logging your weight takes one tap without leaving your coaching screen.

Daily weigh-ins matter for three reasons:

Weight is not a perfect daily signal. It fluctuates for reasons that have nothing to do with fat loss or gain. Water retention, sodium intake, hormonal shifts, and sleep can all move the scale independently of your actual progress. What matters is the trend over time, and consistent daily weigh-ins are what make that trend visible.

Note: If you use a smart scale, connecting Apple Health or Google Health to Carbon will automatically sync your daily weigh-in data, so your weight logs without any manual entry.

Compliance is the foundation of accurate progress evaluation. Carbon can only assess your true rate of change when your logged intake reflects consistent adherence to your Carbon-provided targets. A noncompliant week resets the evaluation method back to a start and end weight comparison, which is less precise than the rolling average Carbon uses after multiple compliant weeks.

The compliance summary in your check-in report accurately reflects your activity across the full check-in period, so you can see exactly how consistent you were and carry that insight into the next week.

The more consecutive compliant weeks you build, the more sophisticated and accurate your evaluations become. For more on why compliance matters and how it is calculated, see Why Compliance Is the Foundation of Your Progress in Carbon.

The more consistently you check in, log your weight, and hit your targets, the more accurately Carbon can coach you toward your goal!