 This is probably the best metabolic calculator available on the net. Though the interface is quite easy to use, the calculations behind the calculator are quite complex.
Instructions:
1. Use the arrows until you have accounted for a full 24 hours.
2. When you reach 24 hours you can no longer use the "Up" arrows, but have decrease something before you can increase something else.
 Float this calculator
BackgroundThe 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 down from age 5 all the way up to obese adults.
References
Energy and Protein Requirements, Proceedings of an IDECG workshop, Edited by Nevin S. Scrimshaw, John C. Waterlow and Beat Schürch. 1994.
Eur J Clin Nutr. 1996 Feb;50 Suppl 1:S1-197.
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.
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