2026-09-16 9 min

VO2 Max Prediction Calculator

VO2 max prediction without exercise: Jackson questionnaire model from age, BMI and activity.

Calculator

Age years

Sex

BMI kg/m2

Activity (0-7) PAR

Results update live as you type

Status:41.1 ml/kg/minGood predictedScore 72/100

VO2 Max Prediction Calculator Results

Score72

Predicted VO241.1 ml/kg/min

METs11.7 METs

RatingGood predicted

ActivityPAR 4/7

ModelJackson model

Predicted VO2max ~41.1 (11.7 METs) at PAR 4 — Good, no sweat required.

Prediction Breakdown

Measure	Value	Context
Predicted VO2	41.1 ml/kg/min	Jackson equation
METs	11.7 METs	vo2 / 3.5
Activity rating	PAR 4/7	self-reported
BMI term	-18.9	weight penalty
Rating	Good	male simplified band
Verdict	Good	prediction read

Recommendations

▸Each PAR point is worth ~2 ml/kg/min — honest activity upgrades pay directly.
▸Validate with a Cooper or Rockport test when training starts.
▸Re-run as weight or habits change; the model tracks lifestyle.
▸Predicted VO2max ~41.1 (11.7 METs) at PAR 4 — Good, no sweat required.

Results

Normal

Prediction Score

72/100

Predicted fitness rating

Predicted VO2

41.1 ml/kg/min

Jackson equation

METs

11.7 METs

Functional capacity

Rating

Good predicted

Simplified band

Activity

PAR 4/7

PAR 0-7

Model

Jackson model

Jackson N-EX

Field-test VO2max lands within ~10% of lab values when protocols are followed; ratio methods trade accuracy for convenience.

Visualizations

Prediction gauges

41.1VO2

46.9METs x4

32PAR x8

VO2max vs 60 reference

Predicted68%

To reference32%

Aerobic Score

Score72/100

Formula

Jackson et al. non-exercise model predicts lab VO2max from demographics plus self-reported activity.

VO2 = 56.363 + 10.987M - 0.381A - 0.754BMI + 1.951PAR

Alternative Form

M = 1 male/0 female; PAR = 0-7 activity rating

Variables

Symbol	Name	Unit	Description
A	Age	years	-0.381 each
M	Male	1/0	+10.987
BMI	Index	kg/m2	-0.754 each
PAR	Activity	0-7	+1.951 each
V	VO2max	ml/kg/min	Model output

Explanation

A 40-year-old active man at BMI 25 predicts ~41 ml/kg/min without breaking a sweat.

Derivation

Jackson, Blair et al. (1990) NASA/JSC non-exercise model.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Start from the intercept.

Base = 56.363

Base:56.363

Intermediate: model constant

Result: 56.363 starting point

Step 2

Add the sex term.

+10.987 if male

Sex:male

Intermediate: + 10.987

Result: 67.35 subtotal

Step 3

Subtract age and BMI.

- 0.381x40 - 0.754x25

Age:40

BMI:25

Intermediate: - 15.24 - 18.85

Result: 33.26 subtotal

Step 4

Add activity credit.

+ 1.951 x PAR 4

PAR:4

Intermediate: + 7.80

Result: 41.1 ml/kg/min

Step 5

Convert to METs.

41.1 / 3.5

VO2:41.1

Intermediate: 41.1 / 3.5

Result: 11.7 METs

Step 6

Rate the prediction.

Male good at 40+

VO2:41.1

Intermediate: band lookup

Result: Good, score 72/100

Final Answer

72/100

Worked Examples

See how the calculator works with different scenarios.

Scenario

40, male, BMI 25, PAR 4.

Inputs

Age:40

PAR:4

Calculation

56.363+10.987-15.24-18.85+7.80

Result

41.1, Good, score 72

Interpretation

Validate with a field test before programming.

Understanding Your Result

Your Result: Prediction Score: 72/100

Typical range: Untrained ~30-40, good 40-52, excellent 52+ (men, lower for women); 1 MET = 3.5 ml/kg/min.

What This Means

The output converts test performances or body metrics into VO2max, METs and an age-aware fitness rating.

Why It Matters

VO2max is the strongest single fitness marker — tracking it shows whether training actually builds the engine.

Professional Interpretation

Coaches test every 8-12 weeks identically and prescribe intervals from the velocity or HR at VO2max.

Estimate vs lab

Masks, treadmills and gas analyzers define truth; field tests approximate it within ~10% — plenty for training.

Rating context

Age and sex grading matters: 45 at 55 beats 45 at 25 relatively. Simplified bands are noted as such.

Recommendations

•Test identically each cycle
•Pair intervals with Zone 2 base
•Allow full effort only when fresh
•Track METs alongside VO2max

Educational Content

Introduction

This calculator estimates aerobic power from field tests or simple body metrics.

Concept Explanation

Oxygen use per kilo predicts endurance; validated equations recover it from performances you can measure anywhere.

Applications

▸Fitness benchmarking

▸Training zones

▸Interval prescription

▸Progress tracking

▸Fat-loss planning

▸Return-to-play checks

Benefits

•Lab-free estimates
•Validated equations
•MET conversions
•Fitness ratings
•0-100 aerobic score

Limitations

•~10% estimate error
•Effort-dependent tests
•Simplified age grading
•No threshold modeling
•Single-test snapshot

Best Practices

•Test fresh and fueled
•Reuse the same course
•Calibrate HR devices
•Retest every 8-12 weeks
•Log conditions

Common Misconceptions

Myth: VO2max is everything.

Truth: It is the engine, but economy and thresholds decide races. Train all three.

Myth: You cannot raise it much.

Truth: Beginners gain 10-20% in months; even veterans nudge it with focused blocks.

Myth: Afterburn melts fat.

Truth: EPOC adds 5-15% atop session burn — real but small next to diet and volume.

Practical Tips

•Warm up 10-15 minutes before tests
•Pace Cooper evenly — no sprint start
•Walk the Rockport briskly, do not run
•Count beep shuttles honestly
•Test morning-fresh, not post-leg-day
•Record weather; heat costs meters

Common Mistakes

Sprint-starting the Cooper

Going out hard spikes lactate; even pacing adds 100+ meters.

Testing fatigued

Post-interval legs test recovery, not fitness. Separate by 48+ hours.

Ignoring the course

Hills and wind corrupt distance tests. Flat, calm, measured only.

One test, one verdict

Single tests carry ~10% error. Confirm with a retest before overhauling training.

Chasing VO2max only

Threshold and economy work raise performance without moving VO2max a point.

Counting afterburn twice

Trackers already include EPOC drift; adding calculator afterburn double-counts.

Assumptions

This calculator makes the following assumptions to provide estimates:

Maximal honest effort: Performance tests assume true full effort to failure or distance.

Flat calm conditions: Wind, hills and heat are assumed negligible.

Healthy adult: Cardiac symptoms override testing — get clearance first.

Working monitor: HR-based methods assume accurate chest-strap readings.

Steady body weight: Weight-based equations use current morning weight.

Limitations

Be aware of these limitations when using this calculator:

~10% error band: Field estimates never match metabolic carts exactly.

Effort dependence: Sandbagged tests produce sandbagged numbers.

Simplified grading: Age/sex ratings here are bands, not clinical norms.

No economy data: Two equal VO2max athletes can race minutes apart.

Snapshot only: One test cannot show the fitness trend — retest.

Frequently Asked Questions

Answers to common questions about this calculator.

What is VO2 max?

Maximum oxygen your body can use during hard exercise, in ml/kg/min. Higher means a bigger aerobic engine — elite endurance athletes exceed 70, untrained adults sit near 30-40.

How is VO2 max estimated without a lab?

Field tests (Cooper run, Rockport walk, beep test) and ratio formulas predict lab values within ~10%. This calculator uses validated published equations.

What is a good VO2 max?

Age- and sex-graded: for a 35-year-old man ~44+ is good, for a woman ~38+. Average untrained adults land near 35 (men) and 30 (women).

Can I improve my VO2 max?

Yes — 10-20% in 8-12 weeks via 2 interval sessions plus Zone 2 base weekly. Beginners improve fastest; elites fight for single points.

What is the Cooper test?

Cover maximum distance in 12 minutes; VO2max = (meters - 504.9) / 44.73. Needs full effort and a measured flat course.

What is the Rockport walking test?

Walk one mile as fast as possible, recording time and ending heart rate; a formula with weight, age and sex estimates VO2max. Ideal for beginners.

What is a MET?

Metabolic equivalent: 1 MET is resting burn (~3.5 ml/kg/min). Running at 10 METs uses ten times resting energy.

How do METs convert to calories?

Calories = METs x weight (kg) x hours. An 8-MET activity for a 70 kg person burns ~560 kcal hourly.

What is EPOC (afterburn)?

Extra oxygen (and calories) consumed repaying exercise debt: ~7% of session burn after steady cardio, ~12-15% after hard intervals.

Does afterburn matter for fat loss?

Modestly — 30-60 kcal after typical sessions. Training volume and diet dominate; treat afterburn as a bonus, not a plan.

What is the beep test?

Shuttle runs at rising speeds until failure; final level converts to VO2max via the Leger equation. A team-sport staple.

Why does VO2 max fall with age?

About 1% yearly past 30 from lower max heart rate and muscle mass. Lifelong intervals halve the decline.

How often should I test?

Every 8-12 weeks under similar conditions. More often just measures noise and fatigue, not fitness.

Do I need max effort for estimates?

Cooper, beep and Rockport need honest full efforts; ratio and questionnaire methods trade some accuracy for zero suffering.

Related Calculators

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Related Guides

Deepen your understanding with these educational resources.

Getting Started with Strength Training

Progressive overload, volume landmarks and recovery basics.

Cardio Training Essentials

Zones, VO2 max and weekly aerobic volume that actually moves fitness.

Nutrition for Active People

Protein, calories and hydration to support training and recovery.

Understanding Recovery

Sleep, rest days and deloads that turn training into adaptation.

Glossary

Technical terms used in mortgage calculations explained in plain language.

VO2 max: Ceiling of oxygen uptake; the headline number of aerobic fitness.
MET: Resting-metabolism multiple; 1 MET = 3.5 ml/kg/min.
Cooper test: 12-minute max-distance run predicting VO2max.
Rockport test: One-mile fast walk with HR for VO2max estimation.
Beep test: Progressive shuttle-run test scored by final level.
Leger equation: Beep-test-to-VO2max formula using speed and age.
Uth ratio: VO2max ≈ 15.3 x (max HR / resting HR).
EPOC: Excess post-exercise oxygen consumption; the afterburn.
Functional capacity: MET level describing what daily life demands you can meet.
Lactate threshold: ~80-90% of VO2max; fastest sustainable hour effort.
ACSM cycling equation: VO2 = 7 + 10.8 x watts / kg for leg ergometry.
Non-exercise model: VO2max predicted from age, BMI and activity (Jackson).

Authoritative References

Trusted sources and standards referenced by this calculator.

ACSM — Exercise guidance and resources Cooper Institute — Fitness testing resources American Heart Association — Fitness resources CDC — Physical activity guidelines NIH — Exercise and health information AtlasCalcs — Health resources

Applicable Standards

ACSM Guidelines for Exercise Testing and PrescriptionCooper 12-minute run test protocol (1968)AHA/ACSM exercise testing methodology

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Page Information

Last Updated:

2026-09-16

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.