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VO2max Bruce Protocol Calculator

Enter your Bruce protocol treadmill time and sex.

Result

34.1 mL/kg/min
Fair (estimate — not medical advice)
10.00 min

How it is calculated

Enter the total time you lasted on the Bruce treadmill test, in minutes (decimals allowed: 10.5 is ten and a half minutes), and choose male or female. For men: VO2max = 14.76 − 1.379·T + 0.451·T² − 0.012·T³. For women: VO2max = 4.38·T − 3.9. T is time in minutes and the result is in mL/kg/min with one decimal. The tool then labels it: below 30 Poor, 30 to under 40 Fair, 40 to under 50 Good, 50 and above Excellent. The same cut-offs apply at every age and sex, which real fitness charts do not do.

The time must be above 0 and no more than 27 minutes, the length of the last Bruce stage. Any result at or below 0 or above 100 is rejected, so for women a time of about 23.8 minutes or more, or under about 0.9 minutes, shows no result. Any sex value other than female is treated as male.

Worked example

A man lasts 10 minutes on the Bruce protocol. Terms: 1.379 × 10 = 13.79; 0.451 × 10² = 45.1; 0.012 × 10³ = 12. VO2max = 14.76 − 13.79 + 45.1 − 12 = 34.07, shown as 34.1 mL/kg/min, which falls in the Fair band (30 to 40). A woman with the same 10 minutes gets 4.38 × 10 − 3.9 = 39.9 mL/kg/min, and 10.5 minutes would give a man 36.1. Each extra half minute adds about two points, so the estimate is sensitive to timing.

Try this example →

Common mistakes

  • Entering the stage reached instead of the time. The formula wants minutes lasted (for example 10.5), not stage 3 or 4.
  • Writing ten minutes thirty seconds as 10.30. The field is decimal minutes, so that is 10.5.
  • Choosing the wrong sex. The two equations differ, and for the same 10 minutes they give 34.1 and 39.9.
  • Using a time from a different protocol (modified Bruce, Balke, a self-paced run). The equations are for standard Bruce stages only.
  • Treating the category as a clinical grade. The bands are fixed cut-offs without age adjustment, and the result is an estimate, not a diagnosis.

Sources

About this calculator

The Bruce protocol is a standardized treadmill exercise test used in cardiology and exercise physiology, in which speed and incline increase together every three minutes through a series of fixed stages until the subject reaches volitional exhaustion or a clinical endpoint is reached. Rather than requiring direct gas-exchange measurement of oxygen consumption, the total time the subject sustains the test can be plugged into sex-specific regression equations (commonly credited to Foster and colleagues) that estimate VO2max — maximal oxygen uptake, expressed in mL/kg/min — from treadmill time alone.

VO2max is widely regarded as the best single indicator of cardiorespiratory fitness, since it reflects the combined capacity of the heart, lungs, and muscles to take up and use oxygen during maximal exertion. Because the Bruce protocol is standardized and widely available, exercise physiologists, cardiac rehabilitation programs, and sports scientists use time-based regression estimates like this one as a practical substitute for direct metabolic cart testing when screening fitness or tracking training progress; this calculator applies the sex-specific regression to a given treadmill time. It is for general fitness estimation only and is not medical advice or a substitute for a supervised clinical stress test.

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Comments (1)

  • Editorial team

    The male and female equations are separate regression lines, so compare a result only with your own earlier tests. The same 12.00 minutes returns 42.4 mL/kg/min for the male setting and 48.7 for the female one. The estimate also assumes you did not hold the handrails, since gripping them lengthens the time. A maximal treadmill test should follow medical clearance. Do you use the standard Bruce stages or a modified version?

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