quiettime · breath · updated 2026-10-28

Your breathing rate:
what's normal, what's slow

Breaths per minute is the one breathing number with a clear reference range and the most consistent research behind it. Here is the range, what slowing down does, and what the number does not mean.

At rest

A healthy adult at rest breathes about 12 to 18 times a minute.¹ That is sitting quietly, not sleeping and not after the stairs.

What counts as slow

A systematic review of slow-breathing studies in healthy people drew the line at under 10 breaths a minute. Of the 15 studies that qualified, most paced people at 6 or 5.5.² The 2014 ratio study compared 6 with 12.³ The diaphragmatic-breathing trial trained people down to about 4.⁴

What slowing down does

The largest review pooled 223 studies and found that vagally mediated heart rate variability rises during slow breathing, right after a single session, and after multi-session programs.⁵ In a single ten-minute session with 828 people, a slower rate predicted lower anxiety afterward, in a straight line between 12 and 6 breaths a minute.⁶ Over a month of five-minute daily practice, the breathing groups in the Stanford trial lowered their day-to-day resting rate more than the meditators did.⁷

What the heart does during slow breathing is visible on a single minute. The pulse quickens on each in-breath and slows on each out-breath, and the slower and deeper the breath, the bigger that swing; the slow-breathing review describes this coupling in detail.² quiettime shows both when the pulse is on: breath from the camera, pulse from AirPods or a Watch.

What the number does not mean

It is not a diagnosis, and it is not a target to force. The studies above paced people; they did not tell them to hit a number and hold it. Some people get more tense, not less, when they watch their own breath closely, and for them the number is something to read afterward, not during. If you sit at 14 and feel fine, you are fine.

Count your own

The simplest way: tap once per breath for a minute. The measured way: quiettime reads your breaths per minute through the front camera during the sit, eyes closed, nothing worn, nothing recorded, and shows it afterward next to your own past sits. How it reads your breath. The rest of the series is on what your breath says while you sit.

How quiettime reads your breath →

Not medical advice.