Estimate METs and VO2max from Bruce treadmill protocol test results.Rough prediction model only. Not a diagnostic tool. Use supervised clinical testing for medical decisions.
Last updated: March 2026 | By Software Calculator Team
METs
13.3
VO2max
46.7
mL/kg/min
Time
13
minutes
| VO2max (ml/kg/min) | Category | Males <40yr | Females <40yr |
|---|---|---|---|
| 50+ | Elite | Athlete/Endurance | Elite athlete |
| 40-49 | Excellent | Superior fitness | Excellent |
| 30-39 | Good | Good fitness | Good |
| 20-29 | Average | Average | Average |
| Below 20 | Below Average | Sedentary/deconditoned | Below average |
Note: Results are rough treadmill-test estimates, not diagnostic measurements. Fitness interpretation depends on age and clinical context.
The Bruce Protocol is a standardized maximal exercise test performed on a treadmill to evaluate cardiovascular fitness. Developed by Dr. Robert A. Bruce in 1963, it remains the most widely used protocol for cardiac stress testing and VO2max estimation in clinical and research settings.
The test consists of seven three-minute stages, each progressively increasing in both speed and incline. The protocol starts at a relatively easy pace (2.74 km/h at 10% grade) and becomes increasingly challenging, with the final stage reaching 9.65 km/h at 22% grade. Most healthy individuals complete between stages 3-6 depending on their fitness level.
The Bruce Protocol provides valuable estimates of METs (Metabolic Equivalents) and VO2max, which are key indicators of cardiovascular fitness and predictors of health outcomes. The test is commonly used for athletic performance assessment, cardiac rehabilitation, and pre-operative risk stratification.
Male VO2max: 14.76 - 1.379(t) + 0.451(t²) - 0.012(t³)
Female VO2max: 4.38(t) - 3.9
Where t = total test time in minutes. Estimated METs are derived from estimated VO2max ÷ 3.5.
Input:
Output:
This result indicates excellent cardiovascular fitness for a 42-year-old male, placing him well above the 90th percentile for his age group.
For males: >50 is excellent, 40-50 is good, 30-40 is average. For females: >45 is excellent, 35-45 is good, 25-35 is average. Values decrease with age.
When performed correctly, the Bruce Protocol estimates VO2max within ±10-15% of lab-measured values. It is considered highly reliable for clinical and fitness assessments.
METs (Metabolic Equivalents) represent exercise intensity as multiples of resting metabolic rate. 1 MET = oxygen consumption at rest (~3.5 mL/kg/min). Higher METs = greater exercise intensity.
Most people reach exhaustion before completing all stages. Stop when you experience chest pain, severe shortness of breath, dizziness, or reach volitional exhaustion. Medical supervision is recommended.
Physiological differences in body composition, hemoglobin levels, and cardiovascular adaptation mean males and females achieve different VO2max values for the same test performance.
Yes! Knowing your METs helps determine exercise intensity for optimal fat burning (60-70% of max) and cardiovascular improvement (70-85% of max).
Enter the stage where the test ended, then add the partial time (e.g., 2 minutes) in the "Minutes in Stage" field.
Retest every 8-12 weeks to track fitness improvements. Significant cardiovascular adaptations typically occur within 6-8 weeks of consistent training.
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