什么是代谢年龄？
代谢年龄将您的BMR与同龄人的平均BMR进行比较。
代谢年龄与生物年龄不同。
代谢年龄比BMI更重要的3个原因
1
BMI忽略肌肉质量。
2
代谢年龄揭示器官效率。
3
代谢年龄较高 = 警告信号。
免费在线计算器 — 无需邮箱
免费代谢年龄计算器
60秒发现您的真实身体年龄
在下方输入您的数据。即时获取您的代谢年龄、BMR和BMI — 免费，无需注册。
✓ 无需邮箱 ✓ Mifflin-St Jeor公式 ✓ 男女结果 ✓ 超过100,000人使用
计算您的代谢年龄
单位：
基于活动的实时Mifflin–St Jeor BMR热量需求。
个人资料
男女分别显示结果。
体型
您的BMR
0
卡路里/天 公式
Mifflin–St Jeor
±5% accuracy 提示
选择活动系数
估算TDEEℹ 此计算器如何工作
此工具使用Mifflin–St Jeor方程估算您的基础代谢率（BMR）。
📝
输入您的数据
年龄、性别、身高和体重
⚡
即时计算
Mifflin–St Jeor公式实时运行
📊
获取结果
BMR + 基于活动的TDEE
💡 快速提示
- • 使用准确的身高/体重；微小变化影响BMR。
- • 选择最符合您每周习惯的活动。
- • 以适度的热量变化为目标，实现可持续目标。
如何计算代谢年龄
计算代谢年龄，请按以下3个步骤：
1
计算您的BMR
BMR是您的身体在完全休息时燃烧的卡路里数量。
| Formula | Best For | Accuracy |
|---|---|---|
| Mifflin-St Jeor | Most people — recommended | Highest (±5%) |
| Harris-Benedict (Revised) | General adults | Moderate (±8%) |
| Katch-McArdle | People who know body fat % | Highest for lean individuals |
Mifflin-St Jeor Formula:
男性: (10 × kg) + (6.25 × cm) − (5 × age) + 5
女性: (10 × kg) + (6.25 × cm) − (5 × age) − 161
2
将您的BMR与年龄组平均值比较
| Age Group | Avg Male BMR | Avg Female BMR | Notes |
|---|---|---|---|
| 20–29 | 1,900–2,000 | 1,550–1,650 | Peak metabolic rate |
| 30–39 | 1,800–1,900 | 1,480–1,580 | Drops ~2%/decade |
| 40–49 | 1,700–1,800 | 1,400–1,500 | Muscle loss accelerates |
| 50–59 | 1,600–1,700 | 1,320–1,420 | Hormonal shifts begin |
| 60–69 | 1,500–1,600 | 1,250–1,350 | Sedentary risk rises |
| 70+ | 1,400–1,500 | 1,180–1,280 | Frailty prevention critical |
3
确定您的代谢年龄评分
将计算出的BMR与最接近的年龄组匹配。
Example: A 50-year-old woman with a BMR of 1,620 cal/day has the metabolic profile of a 38-year-old. Her metabolic age is 38.
代谢年龄计算器 — 男性与女性结果
男性和女性的BMR基线不同：
1
肌肉质量：男性平均多30–40%的肌肉。
2
激素：睾酮增加男性代谢率。
3
体脂构成：女性多6–11%的必需体脂。
♀ 女性特有变化
- Ages 35–45: Estrogen decline slows fat metabolism by up to 15%.
- Menopause: BMR drops an additional 200–300 cal/day for some women.
- Pregnancy: BMR increases by 15–20% to support fetal development.
♂ 男性特有变化
- After age 30: Testosterone drops 1% per year — BMR falls with it.
- After age 50: Muscle loss (sarcopenia) accelerates — BMR drops 1–2%/year.
什么是好的代谢年龄？
A good metabolic age is equal to or younger than your chronological age.
| Result | Meaning | Action |
|---|---|---|
| MA < real age | Excellent — faster metabolism | Maintain your habits |
| MA = real age | Normal — average metabolism | Small improvements help |
| MA > real age by 1–5 yrs | Below average — attention needed | Add resistance training |
| MA > real age by 6+ yrs | Poor — metabolism slowing fast | Immediate lifestyle changes |
5 Factors That Raise Metabolic Age
- ❌ Sedentary lifestyle (no exercise)
- ❌ Low muscle mass
- ❌ Chronic sleep deprivation (<6 hrs)
- ❌ High-processed-food diet
- ❌ Chronic stress and elevated cortisol
5 Factors That Lower Metabolic Age
- ✅ Resistance training 3–4 days/week
- ✅ High-protein diet (1.6–2.2 g/kg)
- ✅ 7–9 hours of sleep/night
- ✅ Slight caloric deficit consistently
- ✅ HIIT 20–30 min, 2×/week
How Is Metabolic Age Calculated on a Smart Scale?
Smart scales use Bioelectrical Impedance Analysis (BIA) to estimate metabolic age. BIA sends a small electrical current through your body to estimate lean body mass and fat mass, then calculates your BMR and compares it to age-group averages.
BIA accuracy depends on 4 conditions:
- 💧 Hydration level — dehydration inflates fat estimates by up to 10%
- ⏰ Time of measurement — morning readings before eating are most accurate
- 👣 Foot electrode positioning — uneven placement creates errors
- 🏃 Athlete vs non-athlete mode — most scales default to non-athlete algorithms
| Method | Accuracy | Cost |
|---|---|---|
| Online calculator (Mifflin-St Jeor) | ±5–8% | Free |
| Smart scale (BIA) | ±8–12% | $30–$300 |
| DEXA scan | ±1–2% | $40–$150/scan |
| Lab calorimetry | ±1% | $200–$400 |
Smart scale brands with metabolic age feature: Withings Body+, Tanita BC-533, Garmin Index S2, InBody H20N, Fitbit Aria Air.
BMI and Metabolic Age Calculator — Two Different Metrics
BMI (Body Mass Index) measures weight relative to height. Metabolic age measures how efficiently your body burns energy.
BMI formula: weight (kg) ÷ height² (m²). A score of 18.5–24.9 is normal.
3 Limitations of BMI:
1
Ignores muscle mass — a 220 lb athlete and a sedentary person can both show BMI of 28
2
Doesn't reveal metabolic health — normal BMI can coexist with a metabolic age 15 years older
3
Race and gender differences are not factored in
Use both metrics together. A healthy person targets: BMI 18.5–24.9 AND a metabolic age at or below their real age.
How to Lower Your Metabolic Age — 7 Proven Methods
1
Build Muscle with Resistance Training
Add 3–4 resistance training sessions per week. Each pound of muscle burns 6–10 extra calories daily at rest. Over time, 10 extra pounds of muscle raises your BMR by 60–100 cal/day.
2
Increase Daily Protein Intake
Eat 1.6–2.2 g of protein per kg of body weight daily. Protein has a thermic effect of 20–30% — meaning 30% of protein calories burn during digestion.
3
Improve Sleep to 7–9 Hours
Sleep deprivation raises cortisol, which breaks down muscle and stores fat. Just 5 nights of 6-hour sleep reduces insulin sensitivity by 25%.
4
Add HIIT 2× Per Week
High-Intensity Interval Training raises BMR for 14–24 hours post-workout — the afterburn effect. A 20-minute HIIT session burns 250–450 extra calories over 24 hours.
5
Cut Processed Foods and Refined Sugar
Processed foods spike insulin, promote fat storage, and reduce muscle protein synthesis. Replace 3 processed meals per week with whole foods to reduce metabolic age by 1–3 years within 90 days.
6
Stay Hydrated — 2–3 Liters Daily
Drinking 500 ml of cold water raises BMR by 24–30% for 60 minutes. Chronic dehydration slows metabolism and reduces exercise capacity.
7
Recalculate Every 90 Days
Track your metabolic age every 90 days. Muscle takes 8–12 weeks to measurably raise BMR. Regular tracking shows which habits actually work for your body.
常见问题 — 代谢年龄
How to calculate metabolic age?
To calculate metabolic age, first calculate your BMR using the Mifflin-St Jeor formula. Then compare your BMR to the average BMR for each age group. The age group whose average BMR matches yours is your metabolic age.
How is metabolic age calculated on a smart scale?
Smart scales use BIA — a mild electrical current passed through your feet — to estimate lean mass and body fat. From these estimates, the scale calculates your BMR and compares it to age-group averages to produce a metabolic age score.
What is considered a good metabolic age?
A good metabolic age is equal to or lower than your real age. A metabolic age 5+ years below your chronological age indicates strong muscle mass, high activity, and efficient calorie burning.
How can I calculate my body age online?
Enter your gender, age, height, weight, and activity level into our free calculator above. The tool calculates your BMR using the Mifflin-St Jeor formula, compares it to age-group averages, and returns your metabolic age — no email required.
What is the difference between BMR and metabolic age?
BMR (Basal Metabolic Rate) is the number of calories your body burns at rest — it is a calorie number, not an age. Metabolic age is the age group whose average BMR matches your BMR. BMR is the input; metabolic age is the output.
Is metabolic age the same as biological age?
No. Metabolic age reflects calorie-burning efficiency. Biological age reflects cellular aging — DNA methylation, telomere length, and organ function. Both can differ from your chronological age, but they measure different things.
Can I improve my metabolic age naturally?
Yes. Resistance training, high-protein diet, quality sleep, and HIIT are the 4 most effective methods. Most people see a measurable improvement in metabolic age within 90 days.
What is a normal metabolic age for a 40-year-old woman?
A normal metabolic age for a 40-year-old woman is 38–42. A metabolic age below 35 indicates above-average metabolic health. A metabolic age above 48 signals a need for diet and exercise changes.
Why is my metabolic age higher than my real age?
A metabolic age above your real age means your BMR is lower than average for your age group. The 4 most common causes are low muscle mass, a sedentary lifestyle, chronic sleep deprivation, and a high-calorie processed diet.
Is a free metabolic age calculator accurate?
A free calculator using the Mifflin-St Jeor formula is accurate within ±5–8%. It is less precise than a DEXA scan but more accessible and useful for tracking progress over time. Accuracy improves if you include body fat percentage in the inputs.
此工具仅供教育目的，不能替代专业医疗建议。