Lean Body Mass Calculator｜去脂体重计算器

去脂体重计算器 | Lean Body Mass Calculator

去脂体重计算器 Lean Body Mass Calculator

输入体重与体脂率（Body Fat %），估算去脂体重 LBM（除脂肪以外的身体质量）。常用于健身增肌、减脂期的进度跟踪与营养/蛋白质规划。
Enter body weight and body fat percentage to estimate Lean Body Mass (LBM). Useful for tracking cutting/bulking progress and nutrition planning.

1. 输入参数 · Inputs
本工具核心计算只用到：体重 + 体脂率。性别不参与计算，仅用于给出更贴近现实的“体脂率常见范围”提示。
The core calculation only needs: weight + body fat %. Sex does not change the math; it only helps show typical BF% ranges as a sanity check.
体重建议使用最近一周的晨起空腹平均值（更稳定）。若用磅（lb），工具会自动换算为公斤参与计算。
For consistency, use the average of morning fasted weigh-ins across a week. If you enter pounds (lb), the tool converts to kg internally.
体脂率可来自：体脂秤、InBody、皮脂夹、Dexa、海军围度法等。不同方法误差可能很大，但“同一方法的趋势变化”往往更有参考价值。
BF% may come from smart scales, InBody, calipers, DEXA, Navy tape method, etc. Absolute accuracy varies, but trends using the same method are often more useful.
3. 使用说明 · Notes
  • 什么是去脂体重（LBM）？ · What is Lean Body Mass?
    去脂体重（Lean Body Mass, LBM）指“除脂肪以外的身体质量”，包含骨骼、肌肉、器官、水分等。它不是“纯肌肉量”，但在健身与营养规划里非常常用。
    LBM is your body mass excluding fat. It includes muscle, bone, organs, and water—so it’s not “muscle mass only”, but it’s widely used for fitness tracking.
  • 核心公式（本工具使用） · Core formula used here
    LBM = Weight × (1 − BF%) Fat Mass = Weight × BF%
    例如：体重 70 kg，体脂 18% ⇒ LBM ≈ 70 × (1−0.18)=57.4 kg；脂肪重量 ≈ 12.6 kg。
    Example: 70 kg with 18% BF ⇒ LBM ≈ 57.4 kg; fat mass ≈ 12.6 kg.
  • 为什么 LBM 比体重更“有用”？ · Why LBM can be more useful than scale weight
    体重会被水分、糖原、盐分摄入、肠道内容物等因素影响。LBM 与脂肪重量拆分后，你更容易判断：你是在“掉脂肪”还是只是“掉水/掉糖原”。
    Scale weight fluctuates with water, glycogen, sodium, and gut content. Splitting weight into LBM and fat mass helps you see whether changes are fat loss or just water/glycogen shifts.
  • 如何把结果用到训练与饮食？ · How to use the results
    ① 蛋白质规划：很多人会按去脂体重来估算蛋白质摄入（例如每 kg LBM 若干克），比按体重更贴近“需要被喂养的组织”。（具体克数因目标/训练强度/体脂水平而异。）
    ② 减脂阶段追踪：如果体重下降但 LBM 下降很快，可能意味着力量训练不足、蛋白不足、热量缺口过大或恢复不足。
    ③ 增肌阶段判断：体重上涨时，若 LBM 也在上升且体脂率可控，通常更接近“干净增重”的方向。
    ① Protein planning: many people estimate protein needs using LBM (grams per kg LBM) since it better reflects lean tissue. Exact targets vary by goals and training.
    ② Cutting: if weight drops and LBM drops too fast, it may suggest insufficient resistance training, low protein, too aggressive deficit, or poor recovery.
    ③ Bulking: if weight increases while LBM rises and BF% stays reasonable, it’s often a better sign of “lean gains”.
  • 体脂率输入的“现实范围提示” · Sanity-check for BF% input
    一般情况下：男性常见体脂区间大致在 10%–25%，女性常见体脂区间大致在 18%–35%（个体差异很大，运动员与特殊人群除外）。
    If you consistently input values far outside typical ranges (e.g., 3% or 60%), double-check the measurement method or input unit.
  • 重要限制（务必读） · Important limitations
    本工具是“基于体脂率估算”的数学拆分：体脂率如果不准，LBM 也会跟着偏差。不同设备/方法之间请不要横向对比绝对值，更建议在同一方法下看趋势。
    This is a math split based on BF%. If BF% is inaccurate, LBM will also be off. Avoid comparing absolute values across different devices/methods; trend tracking within the same method is more reliable.
  • 小建议：如何减少波动 · Tips to reduce noise
    • 用“周平均体重 + 周平均体脂”来算，通常比单次测量稳定。
    • 每次尽量在同一条件下测量（起床后、上厕所后、进食前、相同时间段）。
    • 不要被 1–2 天的变化带节奏，看 2–4 周的趋势更靠谱。
    • Use weekly averages for weight and BF% to smooth day-to-day noise.
    • Measure under similar conditions (morning, fasted, same routine).
    • Don’t overreact to 1–2 days; focus on 2–4 week trends.

免责声明：本工具仅用于健身与营养的粗略估算与学习参考，不构成医疗建议、诊断或治疗方案。若你有疾病、孕期/哺乳期、或特殊身体状况，请咨询医生或注册营养师。
Disclaimer: This tool is for educational estimation only and does not provide medical advice. If you have medical conditions or special circumstances (pregnancy, lactation, etc.), consult a physician or registered dietitian.