Decibel SPL (re 20 µPa) to Decibel re 1 µPa (underwater) Converter
0 dB SPL is about 26.02059991 dB re 1 µPa. Convert decibels SPL (dB SPL) to decibels re 1 µPa (dB re 1 µPa) below: type a value and the result updates as you type.
dB SPL to dB re 1 µPa calculator
Result
Decibel SPL (re 20 µPa) to Decibel re 1 µPa (underwater) conversion
1 dB SPL ≈ 27.02059991 dB re 1 µPaone decibel SPL in decibels re 1 µPa
1 dB re 1 µPa ≈ -25.02059991 dB SPLone decibel re 1 µPa in decibels SPL
Decibel SPL (re 20 µPa) (dB SPL): Sound pressure level in air: 20 times the base-10 logarithm of the RMS sound pressure divided by the reference pressure of 20 µPa. 0 dB SPL is 20 µPa, about the quietest sound a young adult can hear.
Decibel re 1 µPa (underwater) (dB re 1 µPa): Sound pressure level in water and other media: 20 times the base-10 logarithm of the RMS sound pressure divided by the reference pressure of 1 µPa. The same sound reads about 26 dB higher than in dB SPL.
Source:ISO 1683:2015, Acoustics: Preferred reference values for acoustical and vibratory levels
How to convert decibels SPL to decibels re 1 µPa
To convert decibels SPL to decibels re 1 µPa, add about 26.02059991 decibels.
Formula
dB re 1 µPa = dB SPL + 26.02059991
The factor is rounded here. The calculator uses the exact value.
Examples
- 0 dB SPL = 0 + 26.02059991 ≈ 26.02059991 dB re 1 µPa
- 60 dB SPL = 60 + 26.02059991 ≈ 86.02059991 dB re 1 µPa
- 94 dB SPL = 94 + 26.02059991 ≈ 120.0205999 dB re 1 µPa
Decibel SPL (re 20 µPa) to Decibel re 1 µPa (underwater) conversion table
| Decibel SPL (re 20 µPa) (dB SPL) | Decibel re 1 µPa (underwater) (dB re 1 µPa) |
|---|---|
| 0 dB SPL | 26.02059991 dB re 1 µPa |
| 10 dB SPL | 36.02059991 dB re 1 µPa |
| 20 dB SPL | 46.02059991 dB re 1 µPa |
| 30 dB SPL | 56.02059991 dB re 1 µPa |
| 40 dB SPL | 66.02059991 dB re 1 µPa |
| 50 dB SPL | 76.02059991 dB re 1 µPa |
| 60 dB SPL | 86.02059991 dB re 1 µPa |
| 70 dB SPL | 96.02059991 dB re 1 µPa |
| 80 dB SPL | 106.0205999 dB re 1 µPa |
| 90 dB SPL | 116.0205999 dB re 1 µPa |
| 94 dB SPL | 120.0205999 dB re 1 µPa |
| 100 dB SPL | 126.0205999 dB re 1 µPa |
| 110 dB SPL | 136.0205999 dB re 1 µPa |
| 120 dB SPL | 146.0205999 dB re 1 µPa |
| 130 dB SPL | 156.0205999 dB re 1 µPa |
| 140 dB SPL | 166.0205999 dB re 1 µPa |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- What is 0 dB SPL in dB re 1 µPa?
- 0 dB SPL is about 26.02059991 dB re 1 µPa. To convert decibels SPL to decibels re 1 µPa, add about 26.02059991 decibels.
- How do I convert decibels re 1 µPa to decibels SPL?
- To convert decibels re 1 µPa to decibels SPL, subtract about 26.02059991 decibels. The formula is dB SPL = dB re 1 µPa − 26.02059991.
- Is this conversion exact?
- Yes. Both units have exact definitions, but the factor has more decimal places than can be shown, so displayed results are rounded. The calculator works with 50 significant digits before rounding.