Decibel SPL (re 20 µPa) to Micropascal Converter
0 dB SPL is 20 µPa. Convert decibels SPL (dB SPL) to micropascals (µPa) below: type a value and the result updates as you type.
dB SPL to µPa calculator
Result
Decibel SPL (re 20 µPa) to Micropascal conversion
1 dB SPL ≈ 22.44036909 µPaone decibel SPL in micropascals
1 µPa ≈ -26.02059991 dB SPLone micropascal 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.
Micropascal (µPa): One millionth of a pascal. The reference sound pressure in water is 1 µPa.
Source:Decibel SPL (re 20 µPa): ISO 1683:2015, Acoustics: Preferred reference values for acoustical and vibratory levels; Micropascal: SI Brochure, 9th edition (BIPM, 2019)
How to convert decibels SPL to micropascals
To convert decibels SPL to micropascals, divide the level by 20, raise 10 to that power, then multiply by 20.
Formula
µPa = 20 × 10^(dB SPL ÷ 20)
Examples
- 0 dB SPL = 20 × 10^(0 ÷ 20) = 20 µPa
- 60 dB SPL = 20 × 10^(60 ÷ 20) = 20000 µPa
- 94 dB SPL = 20 × 10^(94 ÷ 20) ≈ 1002374.467 µPa
Decibel SPL (re 20 µPa) to Micropascal conversion table
| Decibel SPL (re 20 µPa) (dB SPL) | Micropascal (µPa) |
|---|---|
| 0 dB SPL | 20 µPa |
| 10 dB SPL | 63.2455532 µPa |
| 20 dB SPL | 200 µPa |
| 30 dB SPL | 632.455532 µPa |
| 40 dB SPL | 2000 µPa |
| 50 dB SPL | 6324.55532 µPa |
| 60 dB SPL | 20000 µPa |
| 70 dB SPL | 63245.5532 µPa |
| 80 dB SPL | 200000 µPa |
| 90 dB SPL | 632455.532 µPa |
| 94 dB SPL | 1002374.467 µPa |
| 100 dB SPL | 2000000 µPa |
| 110 dB SPL | 6324555.32 µPa |
| 120 dB SPL | 20000000 µPa |
| 130 dB SPL | 63245553.2 µPa |
| 140 dB SPL | 200000000 µPa |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- What is 0 dB SPL in µPa?
- 0 dB SPL is 20 µPa. To convert decibels SPL to micropascals, divide the level by 20, raise 10 to that power, then multiply by 20.
- How do I convert micropascals to decibels SPL?
- To convert micropascals to decibels SPL, divide the amount by 20, take the base-10 logarithm, then multiply by 20. The formula is dB SPL = 20 × log₁₀(µPa ÷ 20).
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 20 is exact. Displayed results are only rounded when they have many decimal places.