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Welding Gas Consumption Calculator

Work out welding gas consumption instantly with clear inputs, formula shown and shareable results.

About Welding Gas Consumption Calculator

Shielding gas use is flow rate times arc time, plus an allowance for pre-flow, post-flow and line purging that is easily 10 percent of the total. Comparing the result with cylinder content shows how many cylinders a job needs, which is often the constraint on site work.

Formulas

Gas consumed

Litres = flow L/min x arc minutes x (1 + purge allowance)

Cylinders

Cylinders = litres used / cylinder content

Worked example

With the default values below, Welding Gas Consumption Calculator returns Total gas consumed of 1,980. Change any input above and every figure here is recalculated in your browser.

Inputs used

Shielding gas flow rateminimum 1 L/min
15 L/min
Arc timeminimum 1 min
120 min
Cylinder gas contentminimum 1 L
9,000 L
Purge and pre-flow allowanceaccepts 0–50 %
10 %

Results

Total gas consumed
1,980 L
Cylinders required
0.22
Arc time
2.00 h
Consumption per arc hour
990 L/h

Step by step

  1. 1Values used
  2. 2Gas consumed
  3. 3Cylinders
  4. 4Total gas consumed= 1,980 L
  5. 5Cylinders required= 0.22
  6. 6Arc time= 2.00 h
  7. 7Consumption per arc hour= 990 L/h

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Welding Gas Consumption figure worked out?

Litres = flow L/min x arc minutes x (1 + purge allowance). Shielding gas use is flow rate times arc time, plus an allowance for pre-flow, post-flow and line purging that is easily 10 percent of the total.

Does more flow mean better shielding?

Only up to a point. Excessive flow becomes turbulent and draws air into the arc, so porosity often gets worse above roughly 20 L/min on a standard MIG nozzle.

What values do I need to enter?

This calculator takes 4 inputs: Shielding gas flow rate, Arc time, Cylinder gas content, Purge and pre-flow allowance. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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