Phon to sones
Type a value in phon to get it in sone instantly.
2sone
That's about the same as a quiet office. That is a loudness of 2 sones.
Convert the other way: sone to phon
What it means
How loud does it sound?
For steady sounds, using Stevens’ rule above 40 phon. Fan and appliance makers quote sones measured to ANSI/AHRI standards.
The math
How to convert phon to sone
Above 40 phon: sone = 2^((phon − 40) ÷ 10); phon = 40 + 10 × log₂(sone).
Example: 50 phon = 2 sone.
Every unit
That loudness on every scale
Tables
phon to sone conversion table
| phon | sone |
|---|---|
| 20 phon | 0.160206 sone |
| 30 phon | 0.46764 sone |
| 40 phon | 1 sone |
| 50 phon | 2 sone |
| 60 phon | 4 sone |
| 70 phon | 8 sone |
| 80 phon | 16 sone |
| 90 phon | 32 sone |
| 100 phon | 64 sone |
| 110 phon | 128 sone |
| 120 phon | 256 sone |
sone to phon conversion table
| sone | phon |
|---|---|
| 20 sone | 83.2193 phon |
| 30 sone | 89.0689 phon |
| 40 sone | 93.2193 phon |
| 50 sone | 96.4386 phon |
| 60 sone | 99.0689 phon |
| 70 sone | 101.293 phon |
| 80 sone | 103.219 phon |
| 90 sone | 104.919 phon |
| 100 sone | 106.439 phon |
| 110 sone | 107.814 phon |
| 120 sone | 109.069 phon |
Quick answers
Quick answers
- How many sone is 1 phon?
- 1 phon is 5.853×10⁻⁵ sone.
- How many sone is 10 phon?
- 10 phon is 0.025666 sone.
- How many sone is 50 phon?
- 50 phon is 2 sone.
The units
About these units
Phon (phon)
Loudness level: dB of an equally loud 1 kHz tone.
Sones (sone)
Loudness: twice the sones sounds twice as loud.
Keep going