How to convert millipascals to decibels (SPL)
dB SPL = 20 × log₁₀(mPa × 50)Express the quantity as a ratio to the reference level, take the base-10 logarithm, then multiply by 20.
Worked examples
- 1 millipascal1 mPa → 33.97940009 dB SPL
- 5 millipascals5 mPa → 47.95880017 dB SPL
- 10 millipascals10 mPa → 53.97940009 dB SPL
- 20 millipascals20 mPa → 60 dB SPL
- 100 millipascals100 mPa → 73.97940009 dB SPL
Millipascals to decibels (SPL) conversion table
Values are calculated by the conversion engine using the full formula and rounded to 8 significant figures.
| Millipascals (mPa) | Decibels (dB SPL) |
|---|---|
| 0.1 mPa | 13.9794 dB SPL |
| 0.25 mPa | 21.9382 dB SPL |
| 0.5 mPa | 27.9588 dB SPL |
| 1 mPa | 33.9794 dB SPL |
| 2 mPa | 40 dB SPL |
| 3 mPa | 43.521825 dB SPL |
| 4 mPa | 46.0206 dB SPL |
| 5 mPa | 47.9588 dB SPL |
| 6 mPa | 49.542425 dB SPL |
| 7 mPa | 50.881361 dB SPL |
| 8 mPa | 52.0412 dB SPL |
| 9 mPa | 53.06425 dB SPL |
| 10 mPa | 53.9794 dB SPL |
| Millipascals (mPa) | Decibels (dB SPL) |
|---|---|
| 12 mPa | 55.563025 dB SPL |
| 15 mPa | 57.501225 dB SPL |
| 20 mPa | 60 dB SPL |
| 25 mPa | 61.9382 dB SPL |
| 30 mPa | 63.521825 dB SPL |
| 40 mPa | 66.0206 dB SPL |
| 50 mPa | 67.9588 dB SPL |
| 75 mPa | 71.480625 dB SPL |
| 100 mPa | 73.9794 dB SPL |
| 250 mPa | 81.9382 dB SPL |
| 500 mPa | 87.9588 dB SPL |
| 1,000 mPa | 93.9794 dB SPL |
About the units
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).
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.
Frequently asked questions
What is the formula to convert millipascals to decibels (SPL)?
dB SPL = 20 × log₁₀(mPa × 50). Express the quantity as a ratio to the reference level, take the base-10 logarithm, then multiply by 20.
What is 5 millipascals in decibels (SPL)?
5 mPa = 47.95880017 dB SPL.
Is this mPa to dB SPL 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.