BOLT® Score Test

Measure Your BOLT Score

The Body Oxygen Level Test (BOLT) measures your sensitivity to carbon dioxide and breathing efficiency. The ideal BOLT score is 40 seconds.

For an accurate measurement, sit comfortably with a straight back and relaxed shoulders. Rest for at least 10 minutes before testing. The best time to measure is first thing in the morning.
How to Measure Your BOLT Score
  1. Take a normal, gentle breath in through your nose, then allow a normal, gentle breath out through your nose.
  2. After your exhale, hold your nose with your fingers to prevent air from entering your lungs.
  3. Press Start and begin timing your breath hold.
  4. Hold until you feel the first definite desire to breathe — such as an involuntary contraction in your abdomen or throat, the need to swallow, or a constriction of the airways.
  5. Press Stop, release your nose, and breathe in calmly through your nose. Your first breath should be controlled — not a gasp.
  6. Resume normal breathing. Your BOLT score is the number of seconds you held your breath.
Important: BOLT is not a test of how long you can hold your breath. It measures the time until your body's first reaction to a lack of air. If you gasp or breathe heavily afterward, you held too long — try again.
Previous: — seconds
Breathe In 0.0 seconds
Your BOLT Score
0 seconds
Was your first breath after the test calm and through your nose?
Below 10 — Significant Room for Improvement

Your breathing at rest is likely noisy, irregular, or labored. You may sigh or yawn frequently and experience disrupted sleep. The good news: breathing exercises can dramatically improve your health and performance.

10–20 — Building Your Foundation

Your breathing may be compromised by nasal congestion, wheezing, or poor sleep quality. Energy and concentration are likely affected. Focused breathing exercises will improve your sleep, reduce breathlessness, and enhance fitness.

20–30 — Good Breathing Efficiency

Your breathing at rest is quiet, calm, and effortless — well done! There is still room to improve endurance and performance. Each 5-second increase in your BOLT score will noticeably improve your energy and reduce breathlessness during exercise.

30–40 — Very Good — Approaching the Gold Standard

You have excellent CO₂ tolerance and efficient breathing patterns. You're close to the ideal BOLT score of 40 seconds. Advanced techniques and sports-specific exercises can help you reach peak performance.

40+ — Gold Standard — Peak Performance

Outstanding! A BOLT score of 40 seconds is the hallmark of optimal breathing efficiency, as described in Exercise Physiology research. Your breathing rate is likely 8–10 breaths per minute. Maintain your edge with advanced Oxygen Advantage® techniques.

The BOLT score is a subjective measure of breathlessness and CO₂ tolerance. It is not a medical diagnosis. If you have a medical condition, consult your doctor before performing breath-hold exercises.