About us
Test it. Track it. Improve it.
BreathTestOnline.com is a free online breath test: a fast, no-sign-up breath-hold timer plus guided breathing training. We built it because most "lung test" pages are static articles — we wanted something you cando in 5 seconds: tap start, hold your breath, tap stop, get your tier and tips.
Instant test
A breath-hold timer that runs in your browser. No app, no account, no lung test machine.
Honest trends
Retest weekly at the same time of day and watch your 10–20 second gains over two weeks.
Guided training
Box breathing, 4-7-8, and diaphragm builders with pacing so you don't have to count.
What we measure — and what we don't
Our timer measures breath-hold time in seconds — a fun coordination and CO₂-tolerance score. It does not measure lung capacity in liters. Only clinical spirometry with a lung test machine can do that. Read our lung capacity test guide for the difference.
Typical untrained adults land around 30–60 seconds. Over 90 seconds is excellent. One number means little — fitness, smoking, altitude, illness, and time of day shift results by ±10 seconds. Track your trend, not a single attempt.
Safety is the whole point
⚠️ Not a medical test
Always sit down. Never hyperventilate first, never test in or near water, while driving, or while standing. Stop immediately if dizzy or lightheaded. Breath Test is a wellness game, not medical advice. If you feel shortness of breath at rest, skip the test and see a clinician — here's when to worry.
Who runs this site?
BreathTestOnline.com is an independent wellness project maintained by the BreathTestOnline Editorial Team. We don't sell devices, supplements, or diagnoses — just a free timer, trainer, and honest breathing answers. Guides are written as general wellness explainers, reviewed for safety, and updated regularly. Questions, corrections, or feedback? We read everything: contact usor email hello@breathtestonline.com.
Ready to test your lungs?
Take the instant breath test