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Change the answer mode for this tool by selecting pressure loss (ΔP), test volume (V), test duration (t) or leak rate (Q_{L}) as the parameter to calculate instead

**Leak testing products**

- USB pressure sensors for detecting water leaks & restrictions
- 25 psig range high resolution 0-10Vdc output air pressure sensor for leak testing use
- 35 psi g range 0-5Vdc output air pressure sensor for leak testing use
- 10bar differential range 4-20mA output air pressure sensor for leak testing use on a 110bar line

## Related Tools

- Leak rate units conversion
- Pressure units conversion
- Volume units conversion
- Time period units conversion

## User Guide

This tool will calculate any parameter from the formula for leakage rate for a pressurised enclosed space, which includes the difference in pressure from the start to the finish of leak test, the total volume of the space being tested, the elapsed time of the leak test, and the average leakage rate.

### Formulas

The formulas used by this leakage rate calculator to determine each individual parameter are:

ΔP = Q_{L} · t / V

V = Q_{L} · t / ΔP

t = ΔP · V / Q_{L}

Q_{L } = ΔP · V / t

#### Symbols

- ΔP = Pressure loss
- V = Test volume
- t = Test duration time
- Q
_{L}= Leak rate

### Pressure Loss (ΔP)

This is how much the pressure changes during a leak test.

### Test Volume (V)

This is the total internal volume of the vessel being tested.

### Test Duration Time (t)

This is the time taken for the pressure to drop during a leak test.

### Leak Rate (Q_{L })

This is a measure of the rate of gas loss from a test volume over the duration of the leak test. It is intended to provide a measure of the proportion of the total gas that has escaped, so that the same pressure loss for a larger sized volume would result in a larger leak rate value.

The following leak rate units can be used with this calculator:

- millibar litres per second (mbar·L/s)
- pascal cubic metres per second (Pa·m³/s)
- pascal litres per second (Pa·L/s)
- standard litres per minute (atm·L/min, slm, slpm)
- standard cubic millimetres per second (atm·mm³/s)
- standard cubic centimetres per second (atm·cm³/s, sccs)
- standard cubic centimetres per minute (atm·cm³/min, sccm)
- standard cubic centimetres per hour (atm·cm³/h)
- standard cubic metres per minute (atm·m³/min)
- standard cubic feet per minute (atm·ft³/min)
- standard cubic feet per year (atm·ft³/yr)
- micron of mercury litres per second (µHg·L/s, lusec)
- micron of mercury cubic feet per minute (µHg·ft³/min, µHg·cfm)
- micron of mercury cubic feet per hour (µHg·ft³/h)
- torr litres per second (Torr·L/s)

**Leak testing products**

- 7.5 psig RS485 Modbus RTU digital pressure sensor for leak testing use
- Pass/Fail timed 500 kPa pressure leak test software and sensor
- LEO3 Current or Digital Output Pressure Gauge
- 41X Low Range Digital Output Pressure Sensor