How is the walking data logged?
David Christopher Lee logs every day, in the same fields, whether the day is impressive or ordinary: total steps, measured distance, food intake in calories and protein, sleep, body weight on weigh-in days, and notes on soreness, feet, and joints. Lifting days are flagged, because a step count means something different on a day that also carried a training session. Gear is logged separately: every pair of shoes and every walking pad has a start date, a running mileage total, wear photographs at milestones, and a note on what failed first.
The log exists because it runs his own eating targets. His maintenance calories are planned from the step count before the day starts, then checked against weight trend over weeks. A log that decides real meals is a log that gets kept honestly.
What formulas does the calculator use?
- Stride length: estimated at 41.3 percent of height, a standard anthropometric approximation. At 6 foot 0 that gives 29.7 inches, which matches David's measured distance closely. The field is editable for anyone who has measured their own stride.
- Distance: steps multiplied by stride length, divided by 63,360 inches per mile. Kilometers are miles multiplied by 1.60934.
- Standard calorie formula: about 0.04 calories per step for a 150 pound walker, scaled linearly by body weight. Calories = steps × 0.04 × (your weight in pounds ÷ 150). This is a widely used rule-of-thumb estimate, presented as one, not as physiology.
- Terrain adjustment: hills multiply the standard estimate by 1.15. Treadmill incline multiplies it by 1 plus 0.035 per point of grade, so a 10 percent grade multiplies by 1.35.
- Honest range: the standard estimate is shown with a range of plus or minus 10 percent. Individual economy, pace changes, wind, and surface all move the real number.
- Time: distance divided by pace speed. Paces are stroll 2.0 mph, normal 3.0 mph, brisk 3.5 mph, fast 4.0 mph. Moving time only; stops are not modeled.
What is David's logged model, and why is it labeled n=1?
Across hundreds of logged days at a body weight of about 172 pounds, David's maintenance intake, the amount that holds his weight steady on non-lifting days, tracks a simple line: 1,800 base calories plus 60 calories per 1,000 steps. At 30,000 steps that is 3,600 calories of maintenance, before any lifting surplus. The model was fitted to his weight trend, not borrowed from a textbook.
It is labeled n=1 every time it appears, because that is what it is: one man, one metabolism, one city, one climate. It is evidence that a formula can be tested against a real life, and an invitation to test your own. It is not a prescription for your body, and this site never presents it as one.
Why does this site distrust watch calorie numbers?
Because the research does. In a 2017 Stanford University study published in the Journal of Personalized Medicine, seven wrist devices were tested against laboratory measurement: heart rate readings were reasonably accurate, but energy expenditure was not. Even the most accurate device was off by an average of 27 percent on calories, and the least accurate by 93 percent. Step counts and heart rate are usable signals. The calorie number on your wrist is a guess wearing a lab coat.
That is why the Step Lab database publishes formula calories and watch calories in separate columns. The gap between them, across hundreds of days, is itself useful data, and it is published rather than smoothed over.
What does the health research actually say?
The anchor citation on this site is a synthesis of 57 studies published in The Lancet Public Health in July 2025: walking 7,000 steps a day, compared with 2,000, was associated with a 47 percent lower risk of all-cause mortality, with benefits flattening around 8,000 to 10,000 steps a day. Two honesty rules follow from it. First, association is not causation, and the site says so when it cites the figure. Second, the plateau is part of the brand: steps past 10,000 are covered here as fitness, capacity, and body composition, not as ever-increasing life extension.
Health disclaimer
Questions about the method go through the contact route on the About page. Corrections are welcome and, when they are right, they get published with a note.