A scale measures total body mass at one moment. Calk keeps that measurement, but makes decisions from the direction formed by several comparable weigh-ins.
Individual readings and the trend
Illustrative. The dots are the recorded measurements; the line makes their direction easier to read.
Calories are handled in the same way. The app uses a range around the current target rather than grading every day against one exact number.
Weight Trend#
What Calk calculates. Calk keeps the recorded weigh-ins and fits a smoothed line through them. Water, glycogen, food in the digestive tract and measurement conditions can all change an individual reading. In a study of 46 adults living normally, most short-term body-weight change across two weeks was attributed to fat-free mass, which includes body water Bhutani 2017.
The line follows total body weight — fat, water and everything else together — and shows whether it is generally rising, falling or holding around the same level.
What you can do. Use the same scale under reasonably similar conditions. Add measurements often enough to form a line you can read. In a cohort of 10,000 smart-scale users, more frequent self-weighing was associated with better weight outcomes, although the observational study cannot prove cause and effect Vuorinen 2021.
If weighing causes distress or is unsuitable for a medical reason, do not use it as your main monitoring method. The longer explanation is in how to read your weight trend.
Calorie Range#
What Calk calculates. Calk shows a band around the daily target and reports how recent days were distributed around it. A day near either edge is ordinary; the repeated average matters more for the weight trend than an isolated total Schoeller 2009.
What you can do. Aim for a repeatable week rather than the same total every day. If most recorded days stay outside the range, check both sides of the calculation: whether the diary still represents what you eat and whether the target still matches your current weight and goal.
Weight Plateau#
What Calk calculates. A plateau is a smoothed weight trend that remains roughly flat while the goal calls for change. Two similar weigh-ins are not enough. The app needs repeated data before it can distinguish a sustained flat direction from ordinary short-term movement.
What you can do. First check measurement consistency and give the trend enough time to form. If it remains flat, review the repeated parts of the food routine: portions, cooking oil, drinks, snacks, restaurant meals and missed entries. As body weight changes, energy expenditure can change as well, so an older target may also need updating.
Target Recalculation#
What Calk calculates. With enough food and weight data, Calk compares recorded intake with the weight trend to estimate maintenance calories. When the personal data is not sufficient, it uses a formula-based estimate. Predictive equations are population estimates and can differ from measured expenditure for an individual Prado-Novoa 2024.
What you can do. Treat a recalculated target as an updated estimate, not a measurement of metabolism. Keep recording under normal conditions and judge it by what the weight trend does over time.