# Convert PPM To mg/m3 Conversion

## Convert PPM to mg/m3

**Enter a PPM Number**

**Concentration Total Molecular Weight (ex: So2 Molecular weight is 64.1)**

Your NTP Result (mg/m3) Will Be Shown Here

Your NTP Result (ug/m3) Will Be Shown Here

Your STP Result (mg/m3) Will Be Shown Here

Your STP Result (ug/m3) Will Be Shown Here

**STP (Standard Temperature and Pressure):** defined at air 1 atm or 1 atmosphere at 0^{0}C - 273.15 K, 32^{0}F. - In STP (1 Mole) of a Gas is equal to 22.45 Litres

**NTP (Normal Temperature and Pressure):** defined at air 1 atm or 1 atmosphere at 20^{0}C - 293.15 K, 68^{0}F. - In NTP (1 Mole) of a Gas is equal to 24.45 Litres

PPM(Parts Per Million) To Mg/M3.

ppm in NTP = (ppm * molecular weight) / 24.45

exp: (55.6 * 30.6) / 24.5 = 69.58 MgM3

ppm in STP = (ppm * Molecular Weight) / 22.45

exp: (55.6 * 30.6) / 22.5 = 75.61 MgM3