BODE Index Calculator

Quartile	BODE Index	Estimated 4-Year Survival
Quartile 1	0–2	~80%
Quartile 2	3–4	~67%
Quartile 3	5–6	~57%
Quartile 4	7–10	~18%

Domain	Tier	Points
Body-mass index (BMI)	> 21	0
≤ 21	+1
FEV1 (% predicted)	≥ 65	0
50–64	+1
36–49	+2
≤ 35	+3
mMRC dyspnea scale	0–1	0
2	+1
3	+2
4	+3
6-minute walk distance	≥ 350 m	0
250–349 m	+1
150–249 m	+2
≤ 149 m	+3

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Walk-through

How to Use This Calculator

4 steps

1

Enter BMI and FEV1 % predicted

Enter the patient's body-mass index (BMI) and FEV1 as a percent of the predicted value from spirometry. BMI is scored as a simple 2-tier term (above or at/below 21), while FEV1 % predicted uses 4 tiers, with lower values scoring more points.

2

Select the mMRC dyspnea grade and enter 6-minute walk distance

Choose the mMRC dyspnea scale grade (0-4) that best matches the patient's breathlessness during activity, then enter the 6-minute walk test distance in meters. Both are scored on 4-tier scales, with more severe dyspnea and shorter walk distances scoring more points.

3

Read the BODE Index and quartile

The BODE Index tab shows the total score (0 to 10) and the corresponding survival quartile with its estimated 4-year survival rate. Switch to the Survival Estimate tab to see the full quartile table and chart.

4

Review the item breakdown before relying on the result

Use the Item Breakdown tab to double-check every domain's tier and point value against the original derivation table before relying on the computed score in clinical discussions.

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Reference

Formula & Methodology

5 formulas

BODE Index (total)

BODE Index = BMI points + FEV1 points + mMRC points + 6MWT points

The total is a sum of four tiered domain scores. BMI contributes 0 or 1 point; FEV1 % predicted, the mMRC dyspnea scale, and 6-minute walk distance each contribute 0 to 3 points. The total ranges from 0 (best prognosis) to 10 (worst prognosis).

BMI term

BMI > 21 → 0 pts; BMI ≤ 21 → 1 pt

BMI is the only 2-tier domain in the BODE Index. A lower BMI (≤ 21) was associated with worse survival in the derivation cohort and scores 1 point.

FEV1 % predicted term

≥ 65% → 0 pts; 50–64% → 1 pt; 36–49% → 2 pts; ≤ 35% → 3 pts

FEV1 as a percent of the predicted value for the patient's age, sex, and height measures airflow obstruction severity. Lower percentages indicate more severe obstruction and score more points.

mMRC dyspnea term

Grade 0–1 → 0 pts; grade 2 → 1 pt; grade 3 → 2 pts; grade 4 → 3 pts

The Modified Medical Research Council (mMRC) scale is a patient-reported 0-4 grading of breathlessness during activity. More severe dyspnea scores more points.

6-minute walk distance term

≥ 350 m → 0 pts; 250–349 m → 1 pt; 150–249 m → 2 pts; ≤ 149 m → 3 pts

The 6-minute walk test (6MWT) measures functional exercise capacity. A shorter distance walked in 6 minutes indicates lower exercise capacity and scores more points.

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High YMYL

Trust, Methodology & Sources

Reviewed by Calculover Editorial Review · Updated 2026-07-22 · 2 sources

Editorial accountability

Author: Quinn Sumner - Editor

Owner: Quinn Sumner - Editorial owner

Reviewer: Calculover Editorial Review - Clinical-source review

Last reviewed: 2026-07-22

Last verified: 2026-07-22

Data effective: 2026-07-22

Methodology

The calculator implements the BODE Index exactly as published in Celli BR, Cote CG, Marin JM, et al., N Engl J Med 2004;350:1005-1012 — four tiered domain scores (BMI, FEV1 % predicted, mMRC dyspnea scale, 6-minute walk distance) summed to a total ranging from 0 to 10, mapped to four survival quartiles with published 4-year survival rates.

Assumption: The patient has a confirmed diagnosis of COPD and the FEV1 % predicted value reflects a valid, technically adequate spirometry measurement.

Assumption: The mMRC dyspnea grade and 6-minute walk distance reflect the patient's current, stable-state functional status rather than values measured during an acute exacerbation.

Limitations & guidance

The BODE Index was derived in a specific COPD patient cohort; it may not generalize precisely to all patient populations, comorbidity profiles, or COPD phenotypes.

The score reflects a population-level statistical association with survival, not a certainty for any individual patient — it does not account for exacerbation frequency, comorbidities, or treatment response.

This is a prognostic and educational tool, not a substitute for a physician's complete clinical assessment. It should never be used as the sole basis for treatment or goals-of-care decisions.

Professional guidance: This calculator is for education only and is not medical advice, diagnosis, or treatment. The BODE Index supports, but does not replace, the judgment of a licensed clinician evaluating the patient's full clinical picture.

Primary sources

The Body-Mass Index, Airflow Obstruction, Dyspnea, and Exercise Capacity Index in Chronic Obstructive Pulmonary Disease (Celli BR et al., N Engl J Med 2004;350:1005-1012)

MDCalc — BODE Index for COPD Survival

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Glossary

Key Terms Explained

7 terms

BODE Index A 4-domain clinical prediction score (range 0-10) that combines Body-mass index, airflow Obstruction, Dyspnea, and Exercise capacity to estimate survival in patients with chronic obstructive pulmonary disease (COPD).

FEV1 Forced expiratory volume in 1 second — the volume of air a person can forcibly exhale in the first second of a forced breath, measured by spirometry. Expressed here as a percentage of the value predicted for a healthy person of the same age, sex, and height.

mMRC dyspnea scale The Modified Medical Research Council dyspnea scale, a patient-reported 0-4 grading of breathlessness during activity, ranging from 0 (breathless only with strenuous exercise) to 4 (too breathless to leave the house or breathless when dressing).

6-minute walk test A standardized clinical test measuring the distance a patient can walk on a flat, hard surface in 6 minutes, used as a simple, reproducible measure of functional exercise capacity.

COPD Chronic obstructive pulmonary disease — a progressive lung disease, most often caused by smoking, characterized by persistent airflow limitation and breathlessness.

Quartile survival In the BODE Index derivation cohort, patients were grouped into four score-range quartiles (0-2, 3-4, 5-6, 7-10), each with its own published 4-year survival rate, ranging from about 80% in quartile 1 down to about 18% in quartile 4.

BMI Body-mass index — weight in kilograms divided by height in meters squared. In the BODE Index, BMI is used only as a 2-tier threshold at 21, not as a continuous variable.

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Scenarios

Real-World Examples

3 worked examples

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58-year-old with mild COPD

Low BODE Index — Quartile 1

BMI 19 FEV1 % predicted 68 mMRC dyspnea scale 1 6-minute walk distance 300 m

BMI at 19 (≤ 21) adds 1 point, FEV1 at 68% and mMRC grade 1 each add 0 points, and a 300 m walk distance (250-349 m tier) adds 1 point, for a total BODE Index of 2. A score of 2 falls in Quartile 1 (0-2 points), corresponding to an estimated 80% 4-year survival in the derivation cohort.

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66-year-old with moderate-to-severe COPD

Mid-range BODE Index — Quartile 3

BMI 19 FEV1 % predicted 45 mMRC dyspnea scale 2 6-minute walk distance 200 m

BMI at 19 adds 1 point, FEV1 at 45% (36-49% tier) adds 2 points, mMRC grade 2 adds 1 point, and a 200 m walk distance (150-249 m tier) adds 2 points, for a total BODE Index of 6. A score of 6 falls in Quartile 3 (5-6 points), corresponding to an estimated 57% 4-year survival.

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72-year-old with advanced COPD

High BODE Index (≥ 7) — Quartile 4

BMI 23 FEV1 % predicted 40 mMRC dyspnea scale 4 6-minute walk distance 100 m

BMI above 21 adds 0 points, FEV1 at 40% (36-49% tier) adds 2 points, mMRC grade 4 adds 3 points, and a 100 m walk distance (≤ 149 m tier) adds 3 points, for a total BODE Index of 8. A score of 8 falls in Quartile 4 (7-10 points), corresponding to an estimated 18% 4-year survival — the point at which discussions of pulmonary rehabilitation and advanced COPD management become especially important.

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Deep Dive

Understanding the BODE Index Calculator

3 chapters · 4 min read

The BODE Index is a validated prognostic tool for chronic obstructive pulmonary disease (COPD), combining four independent domains — Body-mass index, airflow Obstruction, Dyspnea, and Exercise capacity — into a single 0-10 point score. Derived by Celli and colleagues (NEJM 2004), it predicts multi-year survival more accurately than FEV1 alone, because it captures the systemic, functional, and symptomatic burden of COPD rather than just lung mechanics.

How the BODE Index works

The BODE Index sums four tiered domain scores. BMI is scored on a simple 2-tier scale (0 or 1 point) at a threshold of 21 — patients with a BMI at or below 21 had worse survival in the derivation cohort. FEV1 % predicted, the mMRC dyspnea scale, and 6-minute walk distance are each scored on 4-tier scales (0 to 3 points), where more severe airflow obstruction, more severe breathlessness, and shorter walk distance each add more points. The total ranges from 0 (best prognosis) to 10 (worst prognosis).

The four domains were chosen because each independently predicted mortality in COPD, and combining them produced better discrimination than any single measure — notably outperforming FEV1 alone, which captures airflow limitation but not the systemic muscle wasting, breathlessness, or functional decline that also drive COPD mortality.

Reading the quartiles

The BODE Index derivation cohort was divided into four score-range quartiles, each with a published 4-year survival rate: Quartile 1 (0-2 points) at approximately 80%, Quartile 2 (3-4 points) at approximately 67%, Quartile 3 (5-6 points) at approximately 57%, and Quartile 4 (7-10 points) at approximately 18%. Survival drops sharply between quartiles 3 and 4, making a score of 7 or higher a meaningful threshold for discussing advanced COPD management, pulmonary rehabilitation, and goals-of-care planning.

Limits and how it should be used

The BODE Index is a population-derived prognostic estimate, not a certainty for any individual patient — it does not account for comorbidities, exacerbation frequency, or treatment response, all of which also influence COPD outcomes. It was derived in a specific patient cohort and should be interpreted alongside, not instead of, a full clinical assessment. This calculator is for education and clinical decision support only; prognosis discussions and treatment decisions should always involve the treating clinician's complete evaluation of the patient.

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Questions

Frequently Asked Questions

6 questions

What does BODE stand for?+

BODE stands for Body-mass index, airflow Obstruction (FEV1 % predicted), Dyspnea (mMRC scale), and Exercise capacity (6-minute walk distance) — the four domains combined into the index.

What is the score range for the BODE Index?+

The BODE Index ranges from 0 to 10 points, built from a 0-1 point BMI term plus three 0-3 point terms for FEV1, mMRC dyspnea, and 6-minute walk distance.

What is the 4-year survival by BODE quartile?+

In the original derivation cohort (Celli et al., NEJM 2004), 4-year survival was approximately 80% for quartile 1 (0-2 points), 67% for quartile 2 (3-4 points), 57% for quartile 3 (5-6 points), and 18% for quartile 4 (7-10 points).

What does the mMRC dyspnea scale measure?+

The Modified Medical Research Council (mMRC) dyspnea scale is a 0-4 patient-reported scale of breathlessness during activity, ranging from 0 (breathless only with strenuous exercise) to 4 (too breathless to leave the house or breathless when dressing).

Why does the 6-minute walk test matter for COPD prognosis?+

The 6-minute walk distance is a simple, reproducible measure of functional exercise capacity that integrates cardiopulmonary reserve, muscle function, and symptom burden — a shorter walk distance was independently associated with higher mortality in the BODE derivation cohort.

How is the BODE Index used in COPD management?+

Clinicians use the BODE Index to estimate prognosis, support conversations about pulmonary rehabilitation, advanced therapy, and goals-of-care planning, and to track a patient's trajectory over time — it does not replace individualized clinical judgment.

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Patient Variables

BODE Index & Survival

Your Point Breakdown

4-Year Survival by BODE Quartile

Survival by Quartile — Your Score Highlighted

Every BODE Index Domain & Its Point Value

How to Use This Calculator

Enter BMI and FEV1 % predicted

Select the mMRC dyspnea grade and enter 6-minute walk distance

Read the BODE Index and quartile

Review the item breakdown before relying on the result

Formula & Methodology

Trust, Methodology & Sources

Key Terms Explained

Real-World Examples

58-year-old with mild COPD

66-year-old with moderate-to-severe COPD

72-year-old with advanced COPD

Understanding the BODE Index Calculator

How the BODE Index works

Reading the quartiles

Limits and how it should be used

Frequently Asked Questions

Get a branded PDF of your results

BODE Index Calculator

Patient Variables

BODE Index & Survival

Your Point Breakdown

4-Year Survival by BODE Quartile

Survival by Quartile — Your Score Highlighted

Every BODE Index Domain & Its Point Value

How to Use This Calculator

Enter BMI and FEV1 % predicted

Select the mMRC dyspnea grade and enter 6-minute walk distance

Read the BODE Index and quartile

Review the item breakdown before relying on the result

Formula & Methodology

Trust, Methodology & Sources

Key Terms Explained

Real-World Examples

Understanding the BODE Index Calculator

How the BODE Index works

Reading the quartiles

Limits and how it should be used

Frequently Asked Questions

Get a branded PDF of your results

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