Converter Parts Per Million (ppm) Parts Per million (ppm) Converter for Gases The converter calculates the quantity of gas measured (in unit of (in ppm units)) as a unit of [mg/m 3 [mg/m 3]] and the reverse. The unit ppm can be utilized in a variety of branches and in a variety of ways. The usage of ppm should be noted in fields that require input below so that it can be converted to the correct unit. For more details on the usage of ppm, you may look up the manual below.In this field, you will find you will need to input the entry field in the molecular weight can be selected from the drop-down menu or input the molecular quantity of the gas. If the meaning of molecular mass in the gas isn't clear for you, then try using our molecular-weight Calculator.By inputting either values within the field to formula in units [ppm ] or the increment of mg/m 3 [mg/m 3], the result is immediately converted and displayed at lowest. The significance of the result will be...