COSMED K5 vs VO2 Master Analyzer
Specs, prices, editor verdict, and who should buy which - compared side-by-side.
COSMED K5 (ultra premium, $35,000–$50,000) vs VO2 Master Analyzer (ultra premium, $6,895–$7,595) - different tools for different jobs (see the per-product details below).
Compared on 4 shared specs · same category (ultra premium).
These are close picks. Both score in the same range. The right call depends on buyer profile - read the per-buyer recommendations below.
Side-by-side specs
| Spec | COSMED K5 | VO2 Master Analyzer |
|---|---|---|
| price | $35,000–$50,000 | $6,895–$7,595 |
| type | Portable breath-by-breath metabolic analyzer | Wearable VO2 analyzer |
| measurements | VO2, VCO2, RER, EE, RMR | VO2, VO2max estimation, RER |
| portability | Wearable chest unit, ~2 lbs | Mask-mounted unit |
| battery | 3+ hours | 3-4 hours |
COSMED K5 also publishes: accuracy, warranty
VO2 Master Analyzer also publishes: app
Who should buy which
Family offices with multiple longevity-focused members. Private trainers / coaches serving HNW clients. Buyers who specifically want the gold-standard measurement quality, not the wearable-estimated version.
You only need 1-2 VO2 measurements per year (use a clinic). You don't want B2B-tier purchasing complexity (annual calibration contract, occasional service visits).
Coaches, sports scientists, performance clinics, and university or tactical researchers who need lab-grade VO2 testing in the field. Serious individuals typically access it through a coach or clinic.
You need NIST-traceable, publication-grade reporting or the full clinical metabolic panel (step up to COSMED K5), or you only test once or twice a year (use a clinic that runs one).
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Frequently asked
Which is better, the COSMED K5 or the VO2 Master Analyzer?
They are closely matched on our scoring, so the right pick comes down to your priorities. The verdict and spec table above compare them on price, features, and who each one suits.
How much do they cost?
COSMED K5: $35,000 to $50,000. VO2 Master Analyzer: $6,895 to $7,595. Prices are verified against the manufacturer; check the live links for current pricing.
Who should buy which one?
COSMED K5: Family offices with multiple longevity-focused members. Private trainers / coaches serving HNW clients. Buyers who specifically want the gold-standard measurement quality, not the wearable-estimated version. VO2 Master Analyzer: Coaches, sports scientists, performance clinics, and university or tactical researchers who need lab-grade VO2 testing in the field. Serious individuals typically access it through a coach or clinic.