Consumer devices can give you a rough idea.

But if you want true accuracy, medical-grade reliability, and results you can act on with confidence, choose PeakVO2 for the gold standard. 

*Not all metabolic testing systems are created equal. Here’s why PeakVO2 professional VO₂ max and RMR testing stands above.

FEATUREPEAK VO2 (CLINICAL GRADE)Consumer Devices (Calibre Biometrics, etc.)
AccuracyGold-standard, breath-by-breath analysisEstimates based on algorithms & partial data
ValidationUsed in hospitals, research labs, and elite sports centersLimited or no clinical validation
RMR TestingDirect measurement of oxygen exchangeOften uses prediction equations (can be off 20–30%)
Data ProvidedVO₂ max, ventilatory thresholds, fuel usage (fat vs carb), cardiopulmonary functionBasic VO₂ estimate, limited detail
OversightAdministered & interpreted by a qualified exercise physiologistSelf-administered, little/no expert support