Rockport Walk Test Calculator
VO2max estimate from a 1-mile walk: time, pulse, age, weight.
What it does
The Rockport test grades cardio fitness from a brisk mile walk. No all-out running, no lab mask: walk a measured mile as fast as possible, note the time and ending heart rate, and the Kline 1987 equation estimates VO2max. It suits beginners and older adults where running tests do not.
The tool above runs the full equation in both unit systems. Enter weight, age, sex, mile minutes and seconds, and ending pulse. The default 150 lb, 30 year old male at 15:00 and 130 bpm estimates 46.68 ml/kg/min. Metric mode converts kilograms inside and mirrors at 46.69.
The formula is published science, not gym lore. Kline and colleagues validated the one-mile walk estimate in Medicine and Science in Sports and Exercise, mirrored on PubMed as PMID 3600239. Irvine Valley College and the University of Houston lab manuals print the same constants with worked checks, and ACSM frames submaximal testing standards around them.
Protocol decides accuracy. Flat measured courses, fast walking without breaking into a run, and a true ending pulse keep estimates comparable across months. Retest the same course under similar conditions and track the trend, not single decimals.
How to use
- Pick imperial (lb) or metric (kg).
- Enter weight, age, and sex.
- Walk a measured mile as fast as possible.
- Enter the mile minutes and seconds.
- Enter the ending heart rate.
- Read VO2max; retest the same course later.
Formula
- weight
- Body weight: lb or kg by system.
- age
- Age in years, 10 to 100.
- time
- Mile time: minutes plus seconds/60.
- HR
- Pulse at the finish line, 60 to 220.
Kline et al. 1987, Med Sci Sports Exerc. Time in minutes with seconds/60; HR in bpm at test end. Metric weight converts inside (kg x 2.20462).
Worked example
Example: 150 lb, 30, 15 min mile
Imperial defaults: 150 lb, 30 years, male, 15:00 mile, 130 bpm. Metric mirrors at 68 kg.
- Inputs: 150 lb, age 30, male, 15 min mile, 130 bpm.
- Weight term: 0.0769 x 150 = 11.535. Age term: 0.3877 x 30 = 11.631.
- Time term: 3.2649 x 15 = 48.9735. HR term: 0.1565 x 130 = 20.345.
- Assemble: 132.853 minus 11.535 minus 11.631 plus 6.315 minus 48.9735 minus 20.345.
- Result 46.6835. Tool shows 46.68 ml/kg/min.
Reference table
| Profile | Inputs | VO2max |
|---|---|---|
| 160 lb 30M 15:00 110 | Walk test check | 49.04 |
| 150 lb 30M 15:00 130 | Worked example | 46.68 |
| 140 lb 25F 14:30 140 | Practice case | 43.14 |
| 180 lb 40M 16:00 120 | Practice case | 38.80 |
Limits
- Estimate only. Lab gas analysis rules for precision.
- Walking protocol only; running breaks the model.
- Ignores heat, altitude, grade, and illness effects.
- Single snapshot varies with effort and warmup.
Common mistakes
- Running parts of the test mile.
- Guessing the ending pulse instead of measuring.
- Entering 14:30 as 14.30 minutes.
- Testing hills or short courses.
- Comparing across different courses and weather.
Try it yourself
Quick checks. Answers sit tucked under each question.
140 lb, 25, female, 14:30 mile, 140 bpm?
Time 14.5 min. 0.0769x140=10.766, 0.3877x25=9.6925, 3.2649x14.5=47.34105, 0.1565x140=21.91. 132.853-10.766-9.6925-47.34105-21.91=43.14.
180 lb, 40, male, 16:00 mile, 120 bpm?
0.0769x180=13.842, 0.3877x40=15.508, 3.2649x16=52.2384, 0.1565x120=18.78. 132.853-13.842-15.508+6.315-52.2384-18.78=38.8.
Questions
What is the Rockport formula?
132.853 minus 0.0769xlb minus 0.3877xage plus 6.315xsex minus 3.2649xtime minus 0.1565xHR, male 1 female 0.
How do I take the test?
Walk one mile as fast as possible without running, on a flat measured course, with a heart rate monitor for the ending pulse.
How do I enter the time?
Minutes plus seconds over 60. A 14:30 mile is 14.5 minutes in the formula.
Which heart rate counts?
The ending heart rate right at the finish, in bpm. Higher pulse at the same pace lowers the estimate.
Is walking accurate enough?
Yes. Walking tests suit beginners and older adults where all-out running tests do not. Results are estimates, not lab values.
How do I track progress?
Same course, same warmup, similar conditions. Compare estimates across months, not single decimals.
Sources
- UMass Profiles: Kline et al. 1987 (PubMed PMID 3600239 mirror)
- Irvine Valley College LibreTexts: Rockport Calculation (constants, check)
- ACSM: Estimating Cardiorespiratory Fitness