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Calcimator

Air Sampling Volume Calculator

Calculate total air sample volume from pump flow rate and duration, with STP correction and concentration conversion from analytical results.

Inputs

Results

STP-corrected volume (L)

960

Uncorrected volume (L)960
Concentration (mg/m³)0.16
Concentration (ppm)0.05
Sampling time (hours)8
Min detectable (mg/m³)0.01
Volume M30.96
How to Use This Calculator
  1. Enter Flow rate (L/min), Sampling time (min), and Mass collected (µg).
  2. Set Molecular weight (g/mol), Temperature (°C), and Pressure (mmHg).
  3. Review the STP-corrected volume (L) result.
  4. Use Uncorrected volume (L) and Concentration (mg/m³) to inform your decision.

How the result changes with Flow rate (L/min)

Flow rate (L/min)STP-corrected volume (L)
3.011,444.8
115,280
209,600
2712,960

What each input means

Flow rate (L/min)
Sampling pump calibrated flow rate in litres per minute.
Sampling time (min)
Total sampling duration in minutes (480 min = full 8-hour shift).
Mass collected (µg)
Analytical result — mass of analyte on the collection medium in micrograms.
Molecular weight (g/mol)
Molecular weight of the substance (e.g. benzene = 78.11, toluene = 92.14).
Temperature (°C)
Actual sampling site temperature for volume correction.
Pressure (mmHg)
Barometric pressure at sampling location (760 mmHg = sea level).

What each result means

Uncorrected volume (L)
Raw sample volume = flow rate × time.
STP-corrected volume (L)
Volume corrected to standard conditions (25 °C, 760 mmHg).
Concentration (mg/m³)
Airborne concentration calculated from mass and corrected volume.
Concentration (ppm)
Concentration converted to parts per million (valid for gases/vapours at 25 °C, 1 atm).
Sampling time (hours)
Sampling duration expressed in hours.
Min detectable (mg/m³)
Minimum detectable concentration assuming a 5 µg limit of detection.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Flow rate (L/min) = 2, Sampling time (min) = 480, Mass collected (µg) = 150, Molecular weight (g/mol) = 78 = 6 input(s) provided
  2. Calculate STP-corrected volume
    STP-corrected volume = volumeL * (pressureMmHg / 760) * (298.15 / tempK)
    960 = 960
  3. Calculate Uncorrected volume
    Uncorrected volume = flowRate * samplingMinutes
    960 = 960
  4. Calculate Concentration
    0.156 = 0.156

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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