How to convert decibels to millipascals
mPa = 0.02 × 10^(dB SPL ÷ 20)Decibels are logarithmic. Divide the level by 20, raise 10 to that power, then multiply by the reference (0.02 mPa).
Worked examples
- 20 decibels (SPL)20 dB SPL → 0.2 mPa
- 50 decibels (SPL)50 dB SPL → 6.32455532 mPa
- 80 decibels (SPL)80 dB SPL → 200 mPa
- 94 decibels (SPL)94 dB SPL → 1,002.374467 mPa
- 130 decibels (SPL)130 dB SPL → 63,245.5532 mPa
Decibels (SPL) to millipascals conversion table
Values are calculated by the conversion engine using the full formula and rounded to 8 significant figures.
| Decibels (dB SPL) | Millipascals (mPa) |
|---|---|
| 0 dB SPL | 0.02 mPa |
| 10 dB SPL | 0.063245553 mPa |
| 20 dB SPL | 0.2 mPa |
| 30 dB SPL | 0.63245553 mPa |
| 40 dB SPL | 2 mPa |
| 50 dB SPL | 6.3245553 mPa |
| 60 dB SPL | 20 mPa |
| 70 dB SPL | 63.245553 mPa |
| 80 dB SPL | 200 mPa |
| Decibels (dB SPL) | Millipascals (mPa) |
|---|---|
| 85 dB SPL | 355.65588 mPa |
| 90 dB SPL | 632.45553 mPa |
| 94 dB SPL | 1,002.3745 mPa |
| 100 dB SPL | 2,000 mPa |
| 110 dB SPL | 6,324.5553 mPa |
| 120 dB SPL | 20,000 mPa |
| 130 dB SPL | 63,245.553 mPa |
| 140 dB SPL | 200,000 mPa |
About the units
Decibel (dB SPL)
Sound pressure level relative to 20 µPa, using L = 20·log₁₀(p/p₀). It is a logarithmic level: 0 dB SPL corresponds to 0.00002 Pa.
Millipascal (mPa)
The millipascal (mPa) is a unit of sound pressure level in the International System of Units (SI). One millipascal equals 0.001 pascals (Pa).
Frequently asked questions
What is the formula to convert decibels to millipascals?
mPa = 0.02 × 10^(dB SPL ÷ 20). Decibels are logarithmic. Divide the level by 20, raise 10 to that power, then multiply by the reference (0.02 mPa).
What is 50 decibels (SPL) in millipascals?
50 dB SPL = 6.32455532 mPa.
Is this dB SPL to mPa converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.