Cooper calculator
Enter the distance you covered in 12 minutes.
Full calculator & test guide ↗VO2 max app · iPhone + Apple Watch
Know your true fitness.
Train to
improve it.
VO2 Maximizer turns your VO2 max into a starting point. Run a guided field test, follow HIIT or Zone 2 workouts, and track your progress.
Free download · In-app purchasesField tests estimate VO2 max.
ONE METRIC.
A LIFETIME OF REASONS.
VO2 MAX + LONGEVITY
Train one of the strongest predictors of longevity.
Your aerobic fitness says more than how fast you can run. Cardiorespiratory fitness is a powerful predictor of long-term mortality, adding information beyond risk factors such as smoking, blood pressure and cholesterol.
VO2 max measures your maximum oxygen-use capacity during intense exercise. It’s a key marker of aerobic fitness—and one you can work to improve.
Explore the fitness–longevity connection ↗Higher fitness is associated with lower mortality; it does not predict your lifespan. AHA scientific statement ↗The tools to turn
a baseline into a plan.
Guided tests, purposeful workouts and a clear record of your progress.
FIND YOUR BASELINEFive tests.
Five tests.
One starting point.
Follow audio cues. Get your VO2 max estimate. Find the test that fits you.
Compare the tests ↗9 HIIT WORKOUTSA favourite session.
A favourite session.
A purposeful plan.
Norwegian 4×4, Tabata and more. Built into your 12-week plan, or made your way.
Explore the workouts ↗ZONE 2 TRAININGFind your rhythm.
Find your rhythm.
Stay in your zone.
Live heart-rate guidance on iPhone, with Apple Watch or a compatible Bluetooth strap.
Build your aerobic base ↗
YOUR PEERS. YOUR NEXT TARGET.See where
See where
you stand.
Compare by age, sex, country and job.
Explore the rankings ↗
DAILY READINESS
Push or recover?
Put today’s readiness and recent workload in perspective.
Meet your training plan ↗95Peak
FITNESS AGE + PROJECTION
See the fitter you ahead.
Your fitness age today. Your VO2 max potential over the next 12 weeks.
Explore your potential ↗Fitness Age ›
33.6
1.8 yrs younger
than real age (35.4)
IN 12 WK31.5 yrs45.9VO₂ MAX
NOW33.6 yrs41.4VO₂ MAX
REAL AGE35.4 yrs38.6VO₂ MAX
12-week projection
FITNESS AGE31.5 yrs
Today · 41.4Week 12 · 45.9
EFFORT SCORE
Give your effort context.
A clear score for the session you just finished.
Understand your effort ↗76
EFFORT SCOREVERY HARD
EASYMODHARDHIGHMAX
Very demanding session.
HEART-RATE ANALYSIS
Every rise. Every recovery.
See how your heart rate changed throughout your session.
Look inside your workout ↗▥ ZONE ANALYSISExample session · BPM
PROGRESS, WITH PERSPECTIVEYour work.
Your work.
Taking shape.
Follow your VO2 max history and see the change over time.
Explore your progress ↗Progress6 months · example
VO2 max · mL/kg/minField tests estimate VO2 max; they do not directly measure oxygen consumption as a laboratory test does.
A plan for your weeks.
Context for your days.
Your next workout, your readiness and the bigger picture in one app.
A plan for your next 12 weeks.
Structured sessions based on your starting fitness, with your next workout ready to follow.
Daily readiness.
HRV, sleep and recent training load come together to help put your day in perspective.
Fitness age.
See your cardiovascular fitness in a different light, alongside your VO2 max trend.
Race predictions.
Explore estimated race times from 5K to marathon, based on your current fitness.
Norms by age and sex.
Put a test result in context and follow how your own performance changes. See the tables ↗
Apple Health, connected.
Bring supported health data and workouts into your training history.
FREE TOOLS · NO ACCOUNT NEEDEDStart with a number.
Start with a number.
See what comes next.
Estimate your VO2 max from a field test, then explore your training potential.
Beep test calculator
Enter your level and shuttles completed in that level.
Full calculator & level tables ↗More ways to find your baseline: Yo-Yo, Balke and 2.4 km / 1.5 mile.
Explore all free tools ↗All five guided tests, audio cues and saved results are in the app. Get VO2 Maximizer ↗
Field calculators estimate VO2 max from performance. Compare your result with age and sex norms ↗
YOUR FITNESS, PROJECTEDWhat could your next
What could your next
12 months look like?
Explore training potential using the VO2 max projection model in VO2 Maximizer.
MODELLED VO2 MAX · 12 MONTHS
–
VO2 max · mL/kg/min ● Training potential
How this projection works
This is the app’s VO2 max training-potential model, shown at 3, 6, 9 and 12 months. It uses your starting VO2 max, age and sex, with smaller gains over successive training blocks and an age/sex reference cap. It assumes continued training; individual responses vary.
This is a scenario, not a forecast of years lived or healthy years gained. The app’s separate fitness-age estimate also uses health inputs, so it is not reproduced here. Starting values at or above the model’s cap are marked outside its useful range.
Turn the possibility into a plan.
Get your tailored workouts in VO2 Maximizer.
From people putting in the work.
Two reviews from the App Store.
“I've been using this app for 2 years, including as a beta tester, and the progress has been huge.”
“Most complete app regarding Vo2 max training. Very nice Apple Watch app too.”
Understand your number.
Choose your next step.
Practical guides to testing, VO2 max scores and training.
What Your VO2 Max Score Actually Means
Got a VO2 max number from a lab, field test, or watch? Here is what your score translates to on the FRIEND chart, and what to actually do with it.
Read the guide ↗
How to Run a Beep Test (Step-by-Step Guide)
The 20-meter shuttle test setup, warm-up, pacing strategy, and stop criteria. Everything you need to run a clean beep test from your first attempt.
Read the guide ↗
How to Improve Your VO2 Max: 12-Week Plan
The 12-week training plan that lifted my VO2 max by 6 mL/kg/min: zone-2 base, threshold blocks, HIIT, and the supporting work that actually moves the number.
Read the guide ↗CLEAR ABOUT THE SCIENCEUnderstand
Understand
your estimate.
Each test guide explains the setup, published equation and limits behind your result. Field tests estimate VO2 max from your performance; laboratory tests directly measure oxygen consumption.
Explore the test methods ↗INDEPENDENTLY BUILT
Built by Kevin Floc'h.
A clear explanation of what the app does, how its tests work, and where to get help.
Meet VO2 Maximizer ↗Ask a question ↗Before your first session.
What does this VO2 max app do?
VO2 Maximizer brings guided field tests, HIIT, Zone 2 workouts and progress tracking to iPhone and Apple Watch. Field tests estimate VO2 max from your performance; they do not replace a direct laboratory measurement.
Do I need an Apple Watch?
The app is available on iPhone and Apple Watch. Watch adds wrist-based heart rate and cues. Check the requirements for your chosen test or workout in the app.
Does a field test measure my VO2 max directly?
Field tests estimate VO2 max from performance. They do not replace a direct laboratory assessment of oxygen consumption.
Can I create my own workouts?
Yes. Create your own interval blocks or use a built-in preset.
Where can I see current prices?
The app is free to download with in-app purchases. Apple shows current regional pricing and eligible offers before you confirm a purchase.
Find your starting point.
Build from there.
Five field tests. Guided workouts. Your progress in one app.
Get VO2 Maximizer ↗