ClearBreathsWhat is the breath-hold test?
There are two useful breath-holds. A maximum breath-hold (after a normal breath in) is a fun benchmark of comfort with stillness; most untrained adults manage 30–90 seconds. The BOLT score (Body Oxygen Level Test) is different and more telling: after a normal exhale, you time only until the first definite urge to breathe — a low score points to fast, over-sensitive breathing.
This tool runs both. It gives you a live timer, records your time, and tells you what range you’re in and how to improve it. Improving these numbers isn’t about straining to hold longer — it’s about training slower, calmer breathing so your body tolerates CO₂ better.
How to use it
- Choose the test: maximum breath-hold, or the gentler BOLT (CO₂ tolerance) score.
- For BOLT, breathe normally, exhale, then start the timer and hold after that normal out-breath.
- Stop the timer at the first definite urge to breathe (BOLT) or when you must inhale (max hold).
- Read your time, your range, and what it suggests about your breathing.
- Practise slow nasal breathing for a couple of weeks and re-test — the numbers tend to climb.
Why people use it
- A live, accurate timer for max breath-hold or BOLT
- See what your time means against typical ranges
- BOLT reveals hidden over-breathing most tests miss
- A simple benchmark to track as your breathing improves
Want a plan built around your moment?
These free tools are a great start. For a breathing plan matched to your goal — sleep, calm, focus, or energy — with guided classes and a calm voice that paces every breath, try one guided breath first.
Try one guided breath first Free to start · no credit card before your first resetFrequently asked questions
How long should you be able to hold your breath?
Most untrained adults can hold their breath for 30–90 seconds after a normal breath in. Around 30 seconds is common, over a minute is good, and trained free-divers go far longer. It’s a benchmark, not a competition — never push to the point of distress.
What is a BOLT score?
BOLT (Body Oxygen Level Test) measures CO₂ tolerance: after a normal exhale, you time until the first definite urge to breathe. Under 10 seconds suggests fast, over-sensitive breathing; 20–25+ seconds reflects calm, efficient breathing. It’s measured gently — you stop at the urge, not the limit.
How can I hold my breath longer?
Counter-intuitively, by training slower, lighter everyday breathing rather than practising long holds. Slow nasal breathing and patterns like box breathing raise your CO₂ tolerance over weeks, which lengthens both your BOLT and your comfortable max hold.
Is breath-holding safe?
Gentle breath-holds while sitting are safe for most healthy people. Never do breath-holds in or near water, and avoid maximal holds if you’re pregnant or have heart, lung or blood-pressure conditions without medical advice. Stop at any real discomfort.
Why do I want to breathe so soon?
The urge to breathe is driven by rising CO₂, not low oxygen. A strong, early urge usually means a lower CO₂ tolerance from fast or shallow breathing — which is exactly what slow-breathing practice improves.