1. Use the dials until you have entered time spend on sleeping and other activities on a typical day (24 hours).
2. The calculator assumes that all unaccounted time is spend sitting.
If you want to increase accuracy of your estimation, you should print this sheet and fill it out hour by hour on a typical day. After that - enter values in to the calculator.
The basal metabolic rate is calculated from the Schofield reference formulas used by WHO including age specific formulas for children. Energy cost of activities are based on various references and because children use relative more energy pr. kg body weight than adults, a dynamic correction is used for children depending on body weight.
At the other end of the scale, obese people tend to have their activity dependent energy expenditure overestimated. Accordingly, a correction factor for body mass indexes over 30 is applied.
In summary: this calculator is reliable for children as well as normal weight and obese adults.
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World Health Organisation, Fao, and Unu. Energy and protein requirements. Geneva: WHO, Technical Report Series 724, 1985.
Exercise Physiology, McArdle, Katch & Katch, 5th ed
WHO Obesity Guidelines, 2000 - Technical Report Series 894
Schofield, W.N. 1985. Predicting basal metabolic rate, new standards and review of previous work. Hum. Nutr. Clin. Nutr., 39C (suppl. 1): 5-41.