RMR Testing Near Me
Looking for resting metabolic rate testing near you? Fit Evaluations runs a dedicated metabolic-testing lab at 311 Soquel Ave in downtown Santa Cruz. Direct measurement on a Korr CardioCoach analyzer — the same instrument used in clinical and university labs. $75, 20-30 minutes, same-day report. No predictive equations, no population-average estimates — your actual number.
Drive times to the lab
- • Capitola — 10 min via 41st Avenue
- • Aptos — 15 min via Highway 1
- • Scotts Valley — 15 min down Highway 17
- • Watsonville — 20 min south on Highway 1
- • Santa Cruz Mountains — 30 min
- • Los Gatos — 30 min over Highway 17
- • Monterey / Carmel — 45 min south
- → See all locations we serve
Address: 311 Soquel Ave, Santa Cruz, CA 95062 — easy parking, accessible from Highway 1 and Highway 17. Open in Google Maps →
Why measure your RMR
Your resting metabolic rate is the number of calories your body burns at complete rest — typically 60-75% of total daily energy expenditure, and the largest single number in any nutrition plan. Online calculators (Mifflin-St Jeor, Harris-Benedict, your fitness watch's estimate) use population averages of age, sex, height, and weight to predict RMR. Those predictions can be off by 200-500 kcal/day in either direction for any given individual, which is the difference between consistent fat loss and unexplained stalls.
We measure it directly. You sit relaxed, breathe through a mask connected to a Korr CardioCoach analyzer for 20-30 minutes, and the device samples your expired air to calculate exactly how many calories you're burning at rest — and what fraction is coming from fat versus carbohydrate. The fuel-mix breakdown is the part most calculators don't even attempt; it informs whether time-restricted eating or moderate carb restriction is likely to help, and how much carbohydrate you can tolerate without blunting fat oxidation.
You leave with a same-day written report: your measured RMR (kcal/day), your fat/carb fuel-mix percentage, and a personalized daily calorie target for fat loss, maintenance, or performance based on your activity level.
Who RMR testing is for
Fat loss that has stalled
If you've been tracking calories carefully and the scale isn't moving, the most common reason is a real RMR that's 200-400 kcal lower than the calculator predicted. Measuring puts an actual number on your daily target.
Athletes managing race weight
Endurance athletes who under-eat through a build phase blow up race day. Measured RMR + activity calories from a VO₂ max test gives you the floor below which performance and recovery start breaking down.
Perimenopause and metabolism shifts
Hormonal changes shift RMR in ways calculator inputs don't capture. A measured baseline plus an annual retest is the cleanest way to track real metabolic change rather than guessing from population norms.
Longevity and healthspan
Resting metabolism, body composition, and VO₂ max together are the most actionable longevity-relevant biomarkers most people can measure. The Performance Pack ($300) covers RMR + VO₂ max in one visit.
Frequently asked questions
Fit Evaluations is at 311 Soquel Ave in downtown Santa Cruz, CA. We are the closest dedicated metabolic-testing lab for most of Santa Cruz County (Capitola 10 min, Aptos and Scotts Valley 15 min, Watsonville 20 min), plus Los Gatos via Highway 17 (30 min) and the Monterey Peninsula (45 min south on Highway 1).
$75 for the standalone resting metabolic rate test. Bundled with a VO₂ max test as the Performance Pack the price is $300 — a $25 savings. We accept cash and credit card.
The test itself is 20-30 minutes of quiet, relaxed breathing into a mask while the analyzer samples your expired air. Total visit time including intake and the same-day report is 35-45 minutes.
Fast for 4 hours (water is fine), no caffeine for 4 hours, no exercise for 4 hours, and arrive rested. The test measures your true resting metabolism, so anything that elevates your metabolic rate within those windows will inflate the result. We send a reminder with full prep instructions when you book.
Your resting metabolic rate (RMR) is the number of calories your body burns at complete rest — the largest single component of your daily energy expenditure (typically 60-75% of total calories). The Korr CardioCoach measures the oxygen you consume and the CO₂ you produce, which directly calculates calories burned and the fuel-mix breakdown (fat vs carbohydrate at rest). Predictive equations like Mifflin-St Jeor and Harris-Benedict can be off by 200-500 kcal/day in either direction; a measured RMR is the actual number.
Online calculators use age, sex, height, and weight to predict RMR — population-average inputs against population-average outputs. Real human metabolism varies considerably from those predictions. We commonly see measured RMR sitting 200-400 kcal/day above or below the calculator estimate, which is the difference between consistent fat loss and unexplained stalls.
Your daily calorie target for weight loss should be set against your real RMR plus an honest estimate of your activity calories — not a calculator's guess. With your measured RMR you get a precise daily calorie target for fat loss (typically 300-500 kcal below total daily energy expenditure), maintenance, or performance. The fuel-mix breakdown also tells you how readily your body burns fat at rest, which informs whether time-restricted eating or moderate carb restriction is likely to help.
RMR is the right test if your goal is weight loss, body recomposition, or nutrition planning. VO₂ max is the right test if your goal is athletic performance, training-zone setup, or longevity assessment. Both is the right answer if your goal involves training and body composition — the Performance Pack at $300 covers both in a single visit and saves $25 over booking separately.
Every 8-12 weeks during a fat-loss or muscle-building phase, since meaningful change in lean mass shifts RMR. Annually for general nutrition and longevity tracking. Same-day if your weight has changed by more than 10-15 pounds since the last test.
For groups of 10 or more (corporate wellness, sports teams, clubs) we travel to your site with the same Korr analyzer. For individual testing, the lab visit at 311 Soquel Ave is the standard workflow.
Ready to book your RMR test?
$75 standalone. $300 with VO₂ max (Performance Pack — saves $25). Same-day report. 311 Soquel Ave, Santa Cruz.