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Shielding Gas Consumption and Cost Calculator

Shielding gas is a quiet cost line: often bigger than people think and easy to cut. This calculator estimates monthly volume, cost and cylinder count from flow rate, arc time and the gas wasted in pre-flow and post-flow around every weld.

Your numbers

15 L/min
h
s
per m3
m3

A common 50 litre cylinder at 200 bar holds roughly 10 m3.

10 %

Your results

Total gas per month
82.5
Gas cost per month
$990
Gas used while welding
72
m3 per month.
Gas used in pre/post flow
3
m3 per month.
Cylinders per month
9
Share spent on pre/post flow
4%
High values point to very short welds or long flow timers.

Cylinder content depends on size, pressure and gas type. Use your supplier's delivered cubic metres per cylinder.

Save results:

Monthly gas cost vs flow rate

Sweeps Gas flow rate from 5 to 30, holding your other inputs fixed.

Consumables cost review

Tell us how gas, wire and power are charged to jobs and we will suggest a cleaner costing view.

Optional. The tool and every export work without this. No spam.

How to use it

Enter the flow rate you actually set at the regulator, the arc-on hours per month from your production data, and the number of weld starts. Add the pre-flow and post-flow time per start and your delivered gas price. Add a leak allowance if hoses, fittings or torches are not regularly checked. The result gives gas used, monthly cost, cylinders to order and how much is lost in purge time rather than welding.

The arithmetic

Gas while welding is flow in L/min times 60 times arc hours divided by 1000, in cubic metres. Purge gas is flow times purge seconds times weld starts, divided by 60 and 1000. The sum is increased by the allowance percentage. Multiply by price for cost, and divide by cylinder content to get cylinders. The numbers are simple on purpose so you can check them against your invoices.

Where the savings are

Flow is the lever with the largest effect. Many shops run 18 to 20 L/min out of habit when 12 to 15 holds quality in still air. Drafts do the opposite, so fix drafts before raising flow. Short tack welds with long post-flow timers can burn a large share of the gas, which the purge share output shows. Check hoses and quick connectors for leaks, which are a common hidden loss.

  • Verify flow at the torch with a flow meter
  • Shorten post-flow only as far as the weld stays bright
  • Use the supplier's delivered price per m3

Common mistakes

Confusing the flow meter reading with real flow at the nozzle is common, especially with long hoses and gas savers. Another mistake is quoting cylinders by their water volume rather than delivered cubic metres. Finally, do not cut flow without a trial: porosity rework costs far more than the gas saved.

Frequently Asked Questions

How long does a welding gas cylinder last?

Divide the delivered gas in the cylinder by the flow rate. A 10 m3 cylinder at 15 L/min lasts about 11 hours of continuous flow, which is more than 11 hours of welding because the gas also runs during purge and idle.

What flow rate should I use for MIG?

A common starting range is 12 to 18 L/min in still air, depending on nozzle size, gas type and joint. Windy conditions or large nozzles need more, but excessive flow causes turbulence and can draw air in.

Does pre-flow and post-flow matter that much?

For long welds, no. For production with thousands of short welds, it can account for a significant share of gas. The purge share output shows whether your timers are worth tuning.

Is argon or CO2 cheaper per hour?

CO2 costs less per cubic metre but may lower travel speed and raise spatter. Compare cost per metre of finished weld, not cost per cubic metre of gas.

If gas usage per job is not tracked, Netray can help add consumption capture and variance reporting to your existing ERP or MES data.

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