在人体在清醒而安静的情况下，即不受运动、食物、神经紧张、外界温度改变等影响时，来测定能量的消耗，比较容易做到，且较能反映身体现阶段情况;其以每小时每平方米体表面积来表示能量的消耗比率(焦耳)，这就是基础代谢率。

Formula based on Mifflin, ST St Jeor research in 1990 which is 5% more accurate than equation by Harris-Benedict equation in a survey in 2005. Also reference to Basal metabolic rate in Wikipedia
The BMR data is for referenc only to monitor your daily food intake. Other factors also influence the calory needs.

- 轻量活动：步行４－５公里，购物、洗衣、高尔夫球等 - 中量活动： 园艺、单车、网球等 - 大量活动： 跑步、爬山、游泳、足球等