Safe distance calculator for baby sound machines
Estimates only, for information. This tool is not medical advice.
Not sure how loud a sound is at the crib? Measure the level at 1 metre from the speaker with a decibel-meter app, enter it below with the distance from the speaker to the crib, and get an estimate. Many sources suggest keeping infant sound at or below roughly 50 dB at the baby's head.
How it works
In open space, sound drops by about 6 dB every time the distance doubles: L₂ = L₁ − 20·log₁₀(d₂ / d₁). Without JavaScript, here is the drop relative to the level at 1 m:
| Distance from speaker | Change vs. 1 m |
|---|---|
| 1 m (3 ft) | −0 dB |
| 1.5 m (5 ft) | −4 dB |
| 2 m (7 ft) | −6 dB |
| 3 m (10 ft) | −10 dB |
| 4 m (13 ft) | −12 dB |
Why it is only an estimate
- Real rooms have walls and furniture that reflect sound, so the level drops less than the formula says.
- Phone microphones are not calibrated instruments; treat readings as a rough guide.
- Always confirm with a decibel-meter app held at the height of the baby's head, and keep the level low.
- Sharing a room? The lower limit applies to the youngest child — see sleep sounds for siblings.
What to do with the result
- About 50 dB or lower: nicely low — similar to a quiet conversation.
- 50–60 dB: acceptable, but lower is better; consider turning it down or moving the speaker farther away.
- Above 60 dB: turn it down or move the speaker farther from the crib. Read the safe-volume guide.
Dozefan has a Quiet / Moderate / Loud indicator and loudness-matches all 24 sounds, so switching sounds does not change the level. Not a medical device. About Dozefan →