To convert a 20m Beep Test (Multi-Stage Fitness Test / Bleep Test) score to continuous track Maximal Aerobic Speed (MAS), you must account for the energy cost of 180-degree turns.
Because decelerating, pivoting, and re-accelerating every 20 meters requires continuous eccentric braking, an athlete's straight-line track MAS is approximately 1.0 to 1.5 km/h faster than their final completed Beep Test shuttle speed ($\text{MAS}_{\text{track}} \approx \text{Speed}_{\text{shuttle}} \times 1.08 \text{ to } 1.10$). You can convert your exact level and shuttle automatically with our online Beep Test & MAS Calculator.
The 20-meter Multi-Stage Fitness Test (commonly known as the Beep Test, Bleep Test, PACER test, or Luc Léger shuttle test) is the most widely administered cardiovascular fitness evaluation across global sports leagues, police academies, military branches, and secondary school physical education classes. However, coaches frequently make a major conditioning mistake: they take the final shuttle speed and try to prescribe straight-line interval workouts using that exact number — leading to underestimated training paces.
1. The Biomechanics: Why Shuttle Speed Does NOT Equal Track MAS
In 1982, Dr. Luc Léger and his research team at the University of Montreal published the original 20m shuttle protocol to bring metabolic testing into standard gymnasiums. While practical, shuttle running introduces a distinct biomechanical penalty:
The 180° Deceleration Penalty
Every 20 meters, the runner must drop their center of mass, brake forcefully through the quadriceps and calves, pivot 180 degrees, and push off from zero velocity. This constant stop-and-start action demands significant anaerobic work on every shuttle.
Continuous Linear Efficiency
On a 400m track or open turf, a runner utilizes elastic energy storage in the Achilles tendon and maintains kinetic momentum without breaking stride. Straight-line running economy is 10% to 15% higher.
In a seminal study published by Dr. Dan Baker in the Journal of Strength and Conditioning Research, professional rugby league players who averaged 13.5 km/h (Level 11.0) on the Beep Test were evaluated on a continuous track test. Their true linear MAS averaged 14.8 km/h. If a strength coach prescribed 100% MAS intervals at 13.5 km/h on a track, the workout would be 1.3 km/h too slow to trigger optimal VO₂max adaptations!
2. Mathematical Conversion Models: Formulas That Work
Exercise scientists have developed two validated approaches to convert shuttle test data into linear MAS and VO₂max:
📐 1. Linear Track MAS Conversion (The Baker-Hopkins Model)
For field and track coaches prescribing continuous or linear interval workouts from Beep Test data:
$$\text{Estimated Track MAS (km/h)} \approx \text{Terminal Beep Test Speed (km/h)} \times 1.09$$
Example: A soccer player finishes at Level 12, Shuttle 4 (terminal speed = 14.0 km/h). Their estimated straight-line track MAS is:
- $\text{Track MAS} = 14.0 \times 1.09 \approx \mathbf{15.25\text{ km/h}}$ (4:12 min/km or 6:45 min/mile).
🫁 2. VO₂max Prediction Formula (Ramsbottom et al., 1988)
The internationally cited regression equation developed by Ramsbottom and colleagues predicts laboratory treadmill oxygen uptake from final shuttle velocity:
$$\text{VO}_2\max (\text{ml/kg/min}) = -24.4 + (6.0 \times \text{Final Stage Speed in km/h})$$
For an athlete reaching Level 11 (13.5 km/h): $\text{VO}_2\max = -24.4 + (6.0 \times 13.5) = \mathbf{56.6\text{ ml/kg/min}}$.
⏱️ Convert Your Beep Test Level in 2 Seconds
Select your exact Beep Test level and shuttle in our interactive converter to receive your terminal speed, estimated track MAS, VO₂max, and individual 15s/15s HIIT running distances.
🧮 Open Free Beep Test / MAS Calculator3. Master Beep Test to MAS Conversion Lookup Table
Use this comprehensive lookup chart mapping every standard 20-meter shuttle test level (Levels 4 through 17) against terminal speed, total cumulative distance, estimated linear track MAS, and estimated VO₂max:
| Beep Test Level | Shuttles per Level | Terminal Speed | Cumulative Meters | Estimated Track MAS | Predicted VO₂max | Fitness Standard |
|---|---|---|---|---|---|---|
| Level 4 | 9 | 10.0 km/h (6.2 mph) | 740 m | 11.0 km/h | 35.6 ml/kg/min | Sedentary / Junior PE |
| Level 5 | 9 | 10.5 km/h (6.5 mph) | 920 m | 11.5 km/h | 38.6 ml/kg/min | Fair Elementary/Middle |
| Level 6 | 10 | 11.0 km/h (6.8 mph) | 1,120 m | 12.0 km/h | 41.6 ml/kg/min | Average High School |
| Level 7 | 10 | 11.5 km/h (7.1 mph) | 1,320 m | 12.5 km/h | 44.6 ml/kg/min | Good High School / Police Min |
| Level 8 | 11 | 12.0 km/h (7.5 mph) | 1,540 m | 13.1 km/h | 47.6 ml/kg/min | Club Athlete / Military Standard |
| Level 9 | 11 | 12.5 km/h (7.8 mph) | 1,760 m | 13.6 km/h | 50.6 ml/kg/min | Competitive Female Soccer |
| Level 10 | 11 | 13.0 km/h (8.1 mph) | 1,980 m | 14.2 km/h | 53.6 ml/kg/min | Rugby League / Female Elite |
| Level 11 | 12 | 13.5 km/h (8.4 mph) | 2,220 m | 14.7 km/h | 56.6 ml/kg/min | Collegiate Soccer / Pro Rugby |
| Level 12 | 12 | 14.0 km/h (8.7 mph) | 2,460 m | 15.3 km/h | 59.6 ml/kg/min | Pro Soccer Center-Back / Winger |
| Level 13 | 13 | 14.5 km/h (9.0 mph) | 2,720 m | 15.8 km/h | 62.6 ml/kg/min | Pro Soccer Midfielder Standard |
| Level 14 | 13 | 15.0 km/h (9.3 mph) | 2,980 m | 16.4 km/h | 65.6 ml/kg/min | Elite Endurance Midfielder |
| Level 15 | 13 | 15.5 km/h (9.6 mph) | 3,240 m | 16.9 km/h | 68.6 ml/kg/min | National Distance Runner |
| Level 16 | 14 | 16.0 km/h (9.9 mph) | 3,520 m | 17.5 km/h | 71.6 ml/kg/min | International Elite Athlete |
| Level 17 | 14 | 16.5 km/h (10.3 mph) | 3,800 m | 18.0 km/h | 74.6 ml/kg/min | World Class Aerobic Engine |
4. How to Prescribe Conditioning Workouts Using Beep Test MAS
Once you determine your athlete's estimated track MAS, you can prescribe High-Intensity Interval Training (HIIT) with mathematical certainty:
Straight-Line Track Intervals (Use Track MAS)
When running on a 400m track or long grass pitch, use the Track MAS (e.g. 15.0 km/h). For 15s work at 100% MAS, the distance is: $(15,000\text{ m} / 3600\text{ s}) \times 15\text{ s} = \mathbf{62.5\text{ meters}}$.
Shuttle-Based Intervals (Use Beep Test Speed Directly)
If you are prescribing shuttle intervals (e.g., running out 20m, turning, running back 20m), do not use the track MAS! Use the raw Beep Test terminal speed (e.g. 13.5 km/h). The built-in turning cost matches the shuttle test dynamics.
Supramaximal HIIT (110% to 120% MAS)
For short, high-power intermittent sprints (10s on / 10s off), multiply track MAS by 1.15. For an athlete with a 15.0 km/h MAS, running at 115% MAS means targeting 17.25 km/h (48 meters in 10 seconds).
5. The Yo-Yo Intermittent Recovery Test vs The Beep Test
A frequent point of confusion among coaches is the distinction between the classic Beep Test and the Yo-Yo Intermittent Recovery Test (Yo-Yo IR1 / IR2):
Continuous Beep Test
No rest between shuttles. Speed increases every 60 seconds until voluntary exhaustion. Evaluates pure aerobic capacity and VO₂max.
Yo-Yo Intermittent Test
Runners perform $2 \times 20\text{m}$ shuttles followed by a 10-second active recovery walk. Evaluates repeated high-intensity sprint recovery and anaerobic restoration, making it position-specific for soccer and rugby.
6. Common Protocol Errors That Invalidate Beep Test Scores
❌ Inaccurate 20m Distance
A sports hall marked at 19.5 meters instead of 20.0 meters artificially inflates test scores by 2 to 3 full levels. Always measure with a certified steel tape measure from the inside of both line edges.
❌ Slippery Floor / Inappropriate Footwear
Dusty gymnasium floors cause loss of traction on turns, forcing runners to brake 3 meters early. Sweep the gym floor with a damp mop before testing.
⚠️ Audio Calibration Drift
Low-battery Bluetooth speakers or distorted MP3 audio tracks can lag by 2 to 4 seconds over a 15-minute test. Use a calibrated audio file tested against a digital stopwatch.
⚠️ Premature Turn Pivoting
Runners must place at least one foot on or over the 20m line before the beep sounds. Turning 1 meter early cuts 10% off the running distance.
Frequently Asked Questions (FAQ)
For boys aged 15–17, Level 8.5 to 10.5 is average to above average, while Level 11+ is excellent. For girls aged 15–17, Level 6.5 to 8.5 is average, while Level 9.5+ is advanced athletic performance.
Conducting the test twice or three times per season is ideal: once at the beginning of pre-season training, once prior to competitive match play, and once mid-season to calibrate interval groups.
Athletes with high lean muscle mass (such as rugby props or American football linebackers) must absorb and generate enormous kinetic energy on every 180-degree deceleration. They often have high aerobic engines on rowing machines or stationary bikes, but the shuttle turn disproportionately fatigues their lower extremities.
Yes. Convert your Beep Test level to estimated track MAS using the table above (e.g. Level 11 = 14.7 km/h). Then divide 1,440 by your MAS to find your 400m lap split in seconds ($1440 / 14.7 = \mathbf{98\text{ seconds}}$ per 400m). Or let our free online calculator do it instantly.