VO₂ Max Estimator
Estimate your VO₂ max from resting and maximum heart rate — no lab or field test required.
100% client-side · no upload
Estimated VO₂ Max
Fitness category
How to use
- Enter your maximum heart rate — the highest HR you have ever recorded during all-out effort.
- Enter your resting heart rate — measure first thing in the morning before getting out of bed.
- Results update instantly — see your aerobic capacity score and fitness category.
Related tools
- Heart Rate Zones — five training zones from max HR
- Running Pace Calculator — pace and speed conversion
- Training Load Calculator — RPE × duration session stress
- Marathon Time Predictor — race time from a shorter effort
More ways to use this tool
Frequently Asked Questions
- Is this VO₂ max estimator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The estimator is mobile-first and works on iPhone Safari and Android Chrome.
- How accurate is the HR-based estimate?
- The formula (15 × HRmax ÷ HRrest) has a margin of ±10–15% versus a lab VO₂ max test. It provides a useful baseline and shows improvement over time, but is not a clinical measurement.
- What is a good VO₂ max?
- Average for untrained adults is 35–45 mL/kg/min. Competitive club runners typically score 55–65. Elite distance runners often exceed 70–80 mL/kg/min.
Last updated: By jarvisbox