Transparent by design — computed in your browser from a published formula, not a black box. Verified 2026-05-25. Based on: Cooper 12-minute run test (1968) ↗ · Kline Rockport walk test (1987) ↗
CARDIO · AEROBIC CAPACITY
VO2 Max Estimator
Estimate aerobic capacity with the Cooper 12-minute run or Rockport 1-mile walk field tests.
Result
VO₂ Max Position
Your estimate plotted against broad aerobic fitness bands.
What does the VO2 Max Estimator calculate, and which formula does it use?
The VO2 Max Estimator predicts your maximal aerobic capacity from a field test, no lab needed. The Cooper 12-minute run uses VO₂max = (distance in metres − 504.9) ÷ 44.73; the Rockport 1-mile walk uses a regression on weight, age, sex, walk time, and post-exercise heart rate. It then classifies the result against ACSM percentile norms and, for Rockport, estimates a fitness age.
Last updated:
How to use it
- Use the Cooper Test (maximum distance covered in 12 minutes) or your best recent 1.5-mile time for accurate input. The estimate is only as reliable as the effort — a hard but comfortable 12-minute effort (not all-out sprint) gives the best result.
- VO2 max age-group norms (mL/kg/min) — Men: 20s: 42+ good, 38–42 average; 40s: 35+ good. Women: subtract 6–8 points from each benchmark. Above 50 is excellent at any age.
- VO2 max is highly trainable: 8–12 weeks of consistent Zone 4–5 interval training (3–5 minute hard intervals at near-maximal effort) improves VO2 max by 5–15% in untrained and intermediate individuals.
- A higher VO2 max means you can sustain a faster pace at a lower percentage of maximum effort — this simultaneously improves speed at all distances and improves endurance fatigue resistance.
- Retest every 8–12 weeks. Meaningful gains require consistent cardiovascular training (3+ sessions/week). A 2–4 point VO2 max increase over a 12-week block represents strong aerobic development.
Questions people usually ask
Which estimation methods are available?
Two validated field-test methods: the Cooper 12-minute run test and the Rockport 1-mile walk test.
How accurate are field-test VO₂ max estimates?
Field tests typically correlate 0.85–0.95 with lab-grade gas exchange testing. They are useful for tracking trends but not as precise as clinical measurement.
What is a good VO₂ max score?
For males: 40–50 ml/kg/min is Good to Excellent. For females: 35–45 ml/kg/min. Elite endurance athletes can exceed 70 ml/kg/min.
What is fitness age?
Fitness age estimates your biological age based on aerobic capacity compared to population norms. A 50-year-old with superior VO₂ max may have a fitness age of 35.
Is this tool free and private to use?
Yes. AI Fit Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.
Formula
See the math
The underlying formula with variables defined, derivation shown, and a worked example with units.
For agents
Use in an agent
Same math, same result shape as the UI above — as a static ES module. No HTTP request, no auth, no rate limit.
import { compute } from "https://aifithub.io/engines/vo2-max-estimator.js";Contract: /contracts/vo2-max-estimator.json Types: /engines/vo2-max-estimator.d.ts Full agent guide →
Related Resources
Learn the decision before you act
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