Breath-hold calculator: how long can you hold your breath against a cetacean?

Sitting comfortably in front of your screen? Good. Now breathe in deeply and press the button below: the calculator measures your breath-hold time and compares it in real time with that of 9 representative cetaceans. You will see where you stand between the common dolphin (8 minutes), the sperm whale (record 137 minutes) and Cuvier’s beaked whale, the outright record holder among mammals, with 222 minutes (3 hours 42 minutes) documented by Quick et al. in 2020.

⚠️ For your health: never force a breath-hold. The human world record for static apnoea is 24 minutes (Budimir Šobat, 2021), but it requires extremely closely supervised training. Most untrained adults last 30 seconds to 1 minute before feeling a strong urge to breathe. Stop the test as soon as you feel the need to.

How do cetaceans manage to last so long? Three main physiological adaptations: a myoglobin concentration in their muscles 10 to 30 times higher than ours (an oxygen store), a pronounced dive bradycardia (the heart rate drops to 4-8 beats per minute in the blue whale when submerged), and a rete mirabile that supplies the vital organs first while restricting peripheral circulation. The detail is set out in our dedicated pages on the sperm whale and the rete mirabile.