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Physics Calculators ▶ Air Density Calculator

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**Table of Content**

This air density calculator measures how the air molecules are packed in air. In simple words, this calculator helps in measuring the air density at any pressure and temperature.

Here’s how you can use our density of air calculator:

**Input:**

- Enter the air pressure
- Select the air temperature
- Choose the Air type
- Relative humidity of air
- Hit the calculate button to find the air density

**Output:**

This density air calculator estimates the following calculations:

- Dew point of air
- Pressure of the dry air
- Water vapor pressure
- Air density of air

If we set the temperature at 15 °C & 1013.25 hPa, the air density will be 1.225 kg/(m^3). At sea level, the atmospheric pressure is maximized due to high air pressure. Hence the air is denser at sea level and we can figure this out by the air density calculator.

The density of the air is denoted by the Greek letter Rho (ρ) and it is the measure of the mass per unit volume and we represent the density of air in kg/m3 or g/m3.

You can calculate the air density using the following equation:

**ρ = [(Pd / (Rd * T)) + (Pv / (Rv * T))]**

where:

Pd = Pressure of dry air

Pv = Water vapor pressure

T = Temperature in Kelvins

Rd = Specific gas constant for dry air [287.058 J/(kg·K)]

Rv = Specific gas constant for water [461.495 J/(kg·K)]

If you are thinking about how to calculate density of air then for measuring the air density at a given location, you need some basic weather parameters like the pressure and temperature. To calculate air density from pressure and temperature, you need to understand some basic units of pressure and temperature.

The air pressure is a force exerted on a surface by the air above it as gravity pulls it to Earth. The air pressure is commonly measured with a barometer or in Pascals.

The standard SI unit of pressure is Pascal and the other units are expressed as follows:

**Pascals (Pa)****Standard Atmospheres (ATM)**

**Tor (Torr)**

**bar (bar)**

**Pounds per Square Inch (psi or lb/in2)**

**Technical Atmosphere (at or kgf/cm2)**

**Barad (Ba)**

**Pièze (ps)**

The basic units of temperature are Kelvin (K), centigrade or Celsius (C), and Fahrenheit (F). You need to convert the Fahrenheit to Celsius and Kelvin to calculate air density.

The dew point is the temperature at which the water vapor starts to condense. You can compute the dew point manually or our air density calculator is able to use one of these values to compute the other. Before searching how to find density of air, you need to know about the basic weather parameters.

Below is the basic formula of Air density:

**P = Mass of Air / Volume**

With the help of this formula, you can easily calculate the density of air. Moreover, this formula is also used by an air density calculator.

Here, you can find the density of air in lb/ft3.

Density of air |
Pressure |
Density of air lb/ft3 |

density of air at 15 c |
1 Pascale |
0.00000075474 |

density of air at 20c |
1 Pascale |
0.00000074187 |

density of air at 22 c |
1 Pascale |
0.00000073684 |

density of air at 25 c |
1 Pascale |
0.00000072943 |

density of air at 40 c |
1 Pascale |
0.00000069449 |

We can calculate the air-density in various units like [lbm/ft3], [sl/ft3*10-3] , [lbm/gal(US liq)], [kg/m3]. How to calculate density of air in the above mentioned units, and their connection with the specific weight and thermal expansion.

In the table below we have distinguished the specific weight and thermal expansion coefficient at the various temperatures.

Temperature |
Density |
Specific weight |
Thermal expansion coefficient |
||||

[°F] |
[lbm/ft3] |
[sl/ft3*10-3] |
[lbm/gal(US liq)] |
[kg/m3] |
[lbf/ft3] |
[N/m3] |
[x10-3 °F-1] |

-100 | 0.1104 | 3.431 | 0.01476 | 1.768 | 0.1104 | 17.34 | 2.83 |

-50 | 0.0968 | 3.010 | 0.01295 | 1.551 | 0.0968 | 15.21 | 2.48 |

-20 | 0.0902 | 2.803 | 0.01206 | 1.445 | 0.0902 | 14.17 | 2.30 |

0 | 0.0862 | 2.681 | 0.01153 | 1.382 | 0.0862 | 13.55 | 2.20 |

10 | 0.0844 | 2.624 | 0.01128 | 1.352 | 0.0844 | 13.26 | 2.15 |

20 | 0.0826 | 2.569 | 0.01105 | 1.324 | 0.0826 | 12.98 | 2.10 |

30 | 0.0810 | 2.516 | 0.01082 | 1.297 | 0.0810 | 12.72 | 2.06 |

40 | 0.0793 | 2.466 | 0.01061 | 1.271 | 0.0793 | 12.46 | 2.02 |

50 | 0.0778 | 2.418 | 0.01040 | 1.246 | 0.0778 | 12.22 | 1.98 |

60 | 0.0763 | 2.372 | 0.01020 | 1.222 | 0.0763 | 11.99 | 1.94 |

70 | 0.0749 | 2.327 | 0.01001 | 1.199 | 0.0749 | 11.76 | 1.90 |

80 | 0.0735 | 2.284 | 0.00982 | 1.177 | 0.0735 | 11.55 | 1.87 |

100 | 0.0709 | 2.203 | 0.00948 | 1.135 | 0.0709 | 11.14 | 1.80 |

120 | 0.0685 | 2.128 | 0.00915 | 1.097 | 0.0685 | 10.75 | 1.74 |

140 | 0.0662 | 2.057 | 0.00885 | 1.060 | 0.0662 | 10.40 | 1.68 |

160 | 0.0641 | 1.991 | 0.00856 | 1.026 | 0.0641 | 10.06 | 1.63 |

180 | 0.0621 | 1.929 | 0.00830 | 0.994 | 0.0621 | 9.75 | 1.58 |

200 | 0.0602 | 1.870 | 0.00804 | 0.964 | 0.060 | 9.45 | 1.53 |

250 | 0.0559 | 1.738 | 0.00747 | 0.896 | 0.0559 | 8.78 | 1.41 |

300 | 0.0522 | 1.622 | 0.00698 | 0.836 | 0.0522 | 8.20 | 1.30 |

350 | 0.0489 | 1.521 | 0.00654 | 0.784 | 0.0489 | 7.69 | 1.23 |

400 | 0.0461 | 1.432 | 0.00616 | 0.738 | 0.0461 | 7.24 | 1.16 |

450 | 0.0436 | 1.354 | 0.00582 | 0.698 | 0.0436 | 6.84 | 1.10 |

500 | 0.0410 | 1.274 | 0.00548 | 0.656 | 0.0410 | 6.43 | 1.05 |

600 | 0.0371 | 1.152 | 0.00496 | 0.599 | 0.0371 | 5.82 | 0.96 |

700 | 0.0340 | 1.057 | 0.00455 | 0.545 | 0.0340 | 5.35 | 0.88 |

800 | 0.0315 | 0.978 | 0.00421 | 0.5042 | 0.0315 | 4.94 | 0.81 |

1000 | 0.0272 | 0.845 | 0.00363 | 0.4354 | 0.0272 | 4.27 | 0.70 |

1200 | 0.0239 | 0.743 | 0.00319 | 0.3827 | 0.0239 | 3.75 | 0.61 |

1400 | 0.0213 | 0.663 | 0.00285 | 0.3416 | 0.0213 | 3.35 | 0.54 |

1600 | 0.0193 | 0.599 | 0.00257 | 0.3085 | 0.0193 | 3.03 | 0.49 |

1800 | 0.0176 | 0.546 | 0.00235 | 0.2813 | 0.0176 | 2.76 | 0.45 |

2000 | 0.0161 | 0.501 | 0.00216 | 0.2583 | 0.0161 | 2.53 | 0.42 |

The density of air can be calculated by the below-mentioned steps:

- Find the absolute pressure in Pascal.
- Find the temperature and convert it to Kelvin.
- Input the value of absolute pressure and temperature in the following formula:

**ρ = P/(R×T)**

The average value of density of air at sea level is 1.29 grams/liter or 0.07967 pounds/cubic foot at the 0 degree and 32 degree Fahrenheit at the average sea level. The barometric pressure is 29.92 inches of Hg or 760 mmHg.

The Density of air at 25 degrees Celsius in kg/m3 is 1.168 kg/m3 at (25 °C and 100 kPa). The air density online calculator can find the density of air for both dry and moist atmospheres.

From the source of wikipedia: Density of air, Temperature

From the source of iflycoast.com: Understanding Air Density, Effects of lower density on humans