Convert Decibars to Atmospheres
1 decibar (dbar) equals 0.09869232667 atmospheres (atm).
1 dbar = 0.09869232667 atm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk decibar to atmosphere converter to paste a column from Excel.
How to Convert Decibar to Atmosphere
- 1 dbar = 0.09869232667 atm
- 1 atm = 10.1325 dbar
- Example: convert 15 dbar to atm: 15 dbar = 15 × 0.09869232667 atm = 1.4803849 atm
Formula
atm = dbar × 0.0986923266716
or atm = dbar ÷ 10.1325
Derivation from SI units:
- 1 dbar = 10⁻¹ bar = 10⁴ Pa
- 1 atm = 101 325 Pa (exact, by definition)
- 1 dbar = 10000 Pa ÷ 101325 Pa per atm = 0.0986923266716 atm
Both units are defined exactly, so the factor is exact. Decibar definition: decibar; Atmosphere definition: atmosphere.
Worked examples
- A reading of 50 dbar converts to 4.934616334 atm.
50 dbar × 0.09869232667 = 4.934616334 atm - A value of 1000 dbar is 98.69232667 atm.
1000 dbar × 0.09869232667 = 98.69232667 atm
Decibar to Atmosphere conversion table
| Decibars (dbar) | Atmospheres (atm) |
|---|---|
| 1 dbar | 0.09869232667 atm |
| 5 dbar | 0.4934616334 atm |
| 10 dbar | 0.9869232667 atm |
| 20 dbar | 1.973846533 atm |
| 50 dbar | 4.934616334 atm |
| 100 dbar | 9.869232667 atm |
| 200 dbar | 19.73846533 atm |
| 500 dbar | 49.34616334 atm |
| 1000 dbar | 98.69232667 atm |
| 2000 dbar | 197.3846533 atm |
| 4000 dbar | 394.7693067 atm |
| 6000 dbar | 592.15396 atm |
| 11000 dbar | 1085.615593 atm |
Where it's used
Decibars are used for oceanography: CTD instruments report sea pressure in dbar, while atmospheres appear in chemistry and gas laws (STP and NTP conditions). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Decibar to other pressure units
| Conversion | 1 dbar equals |
|---|---|
| decibar to pascal | 10000 Pa |
| decibar to kilopascal | 10 kPa |
| decibar to megapascal | 0.01 MPa |
| decibar to psi | 1.450377377 psi |
| decibar to bar | 0.1 bar |
| decibar to millibar | 100 mbar |
| decibar to torr | 75.00616827 Torr |
| decibar to millimeter of mercury | 75.00615758 mmHg |
| decibar to millimeter of water | 1019.716213 mmH₂O |
| decibar to centimeter of water | 101.9716213 cmH₂O |
| decibar to inch of water | 40.1463076 inH₂O |
| decibar to inch of water (60 °F) | 40.1864652 inH₂O (60 °F) |
| decibar to inch of mercury | 2.95299833 inHg |
| decibar to atmosphere | 0.09869232667 atm |
| decibar to barye | 100000 Ba |
Frequently asked questions
How many atmospheres are in 1 decibar?
1 dbar = 0.09869232667 atm.
How do I convert decibars to atmospheres?
Multiply the value in dbar by 0.09869232667, or divide it by 10.1325. For example, 15 dbar × 0.09869232667 = 1.4803849 atm.
Is the dbar to atm conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "bar", with SI prefix deci (10⁻¹).
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "atmosphere, standard (atm)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Decibars to Atmospheres. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/decibar-to-atmosphere/
IEEE
Scientific Converters, "Convert Decibars to Atmospheres," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/decibar-to-atmosphere/