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
- 韓国の成人BMI基準：23・25の境界と計算結果の読み方
WHOの国際分類、アジアの行動の目安、韓国の成人BMI分類を区別します。丸めによる境界値の違い、腹囲、個人の診断に使う際の限界を解説します。
- 1日のカロリーを見積もる：安静時エネルギーの計算式と活動係数の限界
身長170 cm、体重70 kg、35歳の成人の安静時エネルギーを計算し、活動量の仮定を比較します。推定値を個人向けの食事指示と取り違えないための説明です。
- たんぱく質摂取量の計算：体重基準と食品表示の読み方
一般成人と運動する人の参考量を区別。70 kgの例、100 g・1食分の表示、1日の合計から、安易に補助食品を追加しない計算を説明します。
- 自宅で取り組む1週間の運動計画：筋力トレーニング、有酸素運動、回復
週2日の筋力トレーニング、正確に数えるウォーキング時間、28分の運動セッション、実用的な回復チェックを組み合わせ、自宅で無理なく続けられる1週間の運動計画を作りましょう。