BODE Index Calculator — COPD Prognosis Score
The BODE index is a validated multidimensional grading system for COPD that predicts mortality more accurately than FEV₁ alone. Enter BMI, post-bronchodilator FEV₁%, mMRC dyspnea grade and 6-minute walk distance to compute the score and estimated 4-year survival quartile.
kg
cm
%
mMRC Dyspnea scale (0–4)
m
Quartile: Q2 (3–4) — Moderate
- 1
BMI
70 ÷ (1.7)² = 24.2BMI ≤ 21 scores 1 pt (B); above 21 scores 0. - 2
Component scores B + O + D + E
0 + 1 + 1 + 1 = 3B = BMI score, O = FEV₁% score (0–3), D = mMRC dyspnea score (0–3), E = 6-min walk score (0–3).
How does this calculator work?
BODE = BMI score (0–1) + FEV₁% score (0–3) + mMRC dyspnea score (0–3) + 6-minute walk score (0–3); range 0–10. Higher scores indicate worse COPD prognosis. Approximate 4-year survival: Q1 (0–2) ~80%, Q2 (3–4) ~67%, Q3 (5–6) ~57%, Q4 (7–10) ~18% (Celli et al. 2004). For clinical use by qualified practitioners only.
Formula
How this is calculated
The BODE index was introduced by Celli et al. in 2004 (NEJM 350:1005–1012) to capture the systemic nature of COPD beyond airflow limitation alone. It combines four independently scored components to produce a total from 0 (least severe) to 10 (most severe).
The B component scores body-mass index: a BMI at or below 21 kg/m² scores 1 point (underweight indicates worse nutritional status and outcomes), above 21 scores 0. The O component scores post-bronchodilator FEV₁ as a percentage of the predicted normal: ≥65% = 0, 50–64% = 1, 36–49% = 2, ≤35% = 3. The D component uses the modified Medical Research Council dyspnea scale (0–4): mMRC 0–1 = 0, mMRC 2 = 1, mMRC 3 = 2, mMRC 4 = 3. The E component scores the 6-minute walk test distance: ≥350 m = 0, 250–349 m = 1, 150–249 m = 2, ≤149 m = 3.
In the original 2004 validation cohort, approximate 4-year survival by quartile was: Q1 (0–2) ~80%, Q2 (3–4) ~67%, Q3 (5–6) ~57%, Q4 (7–10) ~18%. These are population-level estimates; individual prognosis depends on exacerbation history, comorbidities, treatment and many other factors. The BODE index is a clinical research and communication tool, not a diagnostic criterion.
Frequently asked questions
Yes — the original validation study showed the BODE index predicts risk of death from any cause and from respiratory causes better than FEV₁ alone, because it captures exercise tolerance and dyspnea which reflect the systemic disease burden beyond airflow obstruction.
The modified Medical Research Council scale grades breathlessness from 0 (only with strenuous exercise) to 4 (too breathless to leave the house or breathless when dressing). It is self-reported and reflects the impact of dyspnea on everyday activities.
The BODE index is a prognostic tool, not a treatment protocol. Clinicians use it alongside spirometry, imaging and exacerbation history to guide discussions about disease management, pulmonary rehabilitation or transplant evaluation. Do not use this calculator as a substitute for professional medical advice.
TG we-Calculate Editorial Team. (2026). BODE Index Calculator — COPD Prognosis Score [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/bode-index-calculator
TG we-Calculate Editorial Team. "BODE Index Calculator — COPD Prognosis Score." TG we-Calculate. 2026. https://we-calculate.com/calculator/bode-index-calculator.
TG we-Calculate Editorial Team, "BODE Index Calculator — COPD Prognosis Score," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/bode-index-calculator
@misc{wecalculate_bode_index_calculator, title = {BODE Index Calculator — COPD Prognosis Score}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/bode-index-calculator}}, year = {2026}, note = {TG we-Calculate} }
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