Yo-Yo Intermittent Recovery Test (Level 1) VO2 Max Calculator

Calculate your VO2 max

Why add recovery periods?

Bangsbo's rationale: most intermittent sports (soccer, rugby, basketball, tennis, handball) do not involve continuous running. Players sprint, jog, walk, and recover repeatedly across a 45–90-minute match. A continuous-running VO2 max test like the beep test measures aerobic endurance but doesn't match the physiological demands of these sports.

The 10-second active-recovery window in Yo-Yo IR1 engages the anaerobic-to-aerobic recovery processes that determine who lasts through a 90-minute match. Two players with the same VO2 max can score very different Yo-Yo IR1 distances — the test distinguishes between "cardio fit" and "match fit."

For pure VO2 max estimation, however, the formula is calibrated to the distance covered — longer total distance means higher VO2 max, with r ≈ 0.71–0.83 in validation studies.

Protocol

1. Mark the course: a 20m line for shuttles, plus a 5m recovery lane behind the start (so you jog 5m out, 5m back during each recovery).
2. Play the Yo-Yo IR1 audio track. Starting speed is 10 km/h (slower than beep test); speed increases as you progress through levels. Each shuttle is 20m out + 20m back = 40m of running.
3. Run each 2×20m shuttle in sync with the beeps. After finishing, use the 10-second recovery window to jog 5m and back — not walk, not stop. Return to the start line before the next beep.
4. Continue until you fail to reach the 20m line by the next beep on two consecutive shuttles.
5. Record total distance covered in meters (not counting the 5m recovery jogs — only the 40m shuttles). Enter in the calculator.

Each shuttle = 40m. To estimate distance: count how many shuttles you completed and multiply by 40. If the audio ends mid-shuttle, count only the fully completed 40m segments.

Reference distances

Accuracy

In Bangsbo's validation studies, correlation with directly measured VO2 max is r = 0.71–0.83, with SEE around 4–5 ml/kg/min. The modest correlation reflects what the test actually measures: Yo-Yo IR1 distance depends on anaerobic recovery capacity and lactate tolerance in addition to pure aerobic VO2 max.

For a sharper VO2 max estimate, a continuous test (Cooper, 1.5-mile run) is preferred. But for match-fitness — the thing the Yo-Yo IR1 is actually designed to measure — no other field test comes close.

Yo-Yo variants

• Yo-Yo IR1 (this test): starts at 10 km/h. Suitable for recreational to professional athletes. Our calculator's formula applies.
• Yo-Yo IR2: starts at 13 km/h. For elite-only athletes. A 200m score on IR2 ≈ 1000m on IR1. Different formula required.
• Yo-Yo Intermittent Endurance Test (IE1, IE2): 5-second recovery windows instead of 10. Lower intensity, longer duration. Different formula.

When to use Yo-Yo IR1

• Soccer, rugby, hockey, basketball, handball, lacrosse training. Most sport-specific field test available.
• Tracking match-fitness through a season. Retest every 4–6 weeks; changes of 100+ m are meaningful.
• Selection and recruitment. Used by MLS, Premier League academies, Australian Football League, many others.

For individual aerobic assessment without a sport-specific requirement, use the Cooper 12-minute run or continuous beep test.

Frequently asked questions

What is the Yo-Yo IR1 VO2 max formula?

VO2 max (ml/kg/min) = distance × 0.0084 + 36.4, where distance is total meters covered in 20m shuttles (excluding the 5m active-recovery jogs). Bangsbo J, Iaia FM, Krustrup P, Sports Med 2008;38(1):37-51.

How accurate is the Yo-Yo IR1 for VO2 max?

Correlation with directly measured VO2 max is r = 0.71–0.83 with a standard error of estimate around 4–5 ml/kg/min. Moderate accuracy; lower than Cooper or beep test because Yo-Yo performance depends on anaerobic recovery capacity in addition to pure aerobic fitness.

What is a good Yo-Yo IR1 distance?

For recreational athletes: 400–800 m. For competitive amateurs: 800–1,600 m. Semi-professional soccer players: 1,600–2,000 m. Top-flight male professionals: 2,400+ m. Elite international midfielders: 2,800+ m.

What's the difference between Yo-Yo IR1 and IR2?

Starting speed. IR1 starts at 10 km/h (slow jog). IR2 starts at 13 km/h — much harder and designed only for elite athletes. A 200m score on IR2 approximately equals a 1,000m score on IR1. Use IR1 unless you're specifically testing elite-level performers.

Do I count the 5m recovery jogs in my distance?

No. Only count the 20m shuttles (each shuttle = 40m total: 20m out + 20m back). The recovery jogs are separate and not included in the distance input to the formula.