Adult BMI and Daily Energy Estimate
Calculate adult BMI and estimate daily energy expenditure from age, sex and activity. This is not a body-fat measurement, diagnosis or dietary prescription.
Moderate exercise (3–5x/week)
Enter adult age (18–120), height (100–250 cm) and weight (25–350 kg). Outside this range, seek an individual assessment.
Note: Based on Korean obesity standards. Mifflin-St Jeor formula.
Frequently Asked Questions
Q. What does BMI calculate?
Body weight in kilograms divided by height in metres squared. At 170 cm and 70 kg it is about 24.2. It does not measure body fat or muscle mass.
Q. Why do classification thresholds differ?
Korean adult criteria use 23 to below 25 for pre-obesity and 25 or more for obesity. International comparisons often use 25 and 30. Neither classification alone diagnoses an individual.
Q. Is energy expenditure measured?
No. The Mifflin–St Jeor equation estimates resting energy, then an activity multiplier estimates daily expenditure. Incorrect age or activity can materially change the result.
Q. Who needs a different assessment?
Children and adolescents need age-specific growth references. Pregnancy, breastfeeding, illness, disordered eating, age-related muscle loss and athletic physiques require individualized assessment.
Q. Will the suggested calories guarantee a weight change?
No. Water, muscle, actual activity and adaptation change outcomes. Gain/loss options and target dates are simplified illustrations, not dietary prescriptions.
Q. Is the macro split personalized?
No. It demonstrates conversion from calorie percentages to grams of carbohydrate, protein and fat. Protein needs depend separately on body weight, activity and health.
How to Use
Enter height, weight, age and the sex used by the equation.
Choose a realistic activity level and read the limits before interpreting the result.
Worked example: Adult BMI and Daily Energy Estimate
For a 35-year-old man at 170 cm and 70 kg, the equation is 10×70 + 6.25×170 − 5×35 + 5 = 1,592.5 kcal. Multiplying by 1.55 gives about 2,468 kcal. Choosing a different activity multiplier changes the estimate without changing body size. Use it as a starting point for individualized assessment and longer-term trends, not as a prediction of daily weight.
Guides that go with this calculator
- 韩国成人BMI标准：理解23、25的界限与计算结果
区分世界卫生组织国际分类、亚洲公共卫生行动参考点和韩国成人BMI标准，结合四舍五入临界值、腰围与体检结果，了解单凭BMI判断个人健康的局限。
- 每日热量估算：静息能量公式与活动系数的局限
计算身高170 cm、体重70 kg、年龄35岁的成年人的静息能量，比较不同的活动量假设，避免把估计值误当成个人饮食处方。
- 蛋白质摄入量计算：体重参考与食品标签读法
区分普通成人和运动人群的参考量，用70 kg示例、每100 g及每份标签计算全天总量，不在漏算其他餐食时直接增加补充剂。
- 居家一周运动计划：力量训练、有氧活动与恢复
安排一周能够坚持的居家运动：两天力量训练、清楚计算的步行时间、一次28分钟训练，以及实用的恢复情况检查。