Plan bottle changes before the job catches you out
Estimate how long one bottle may last so site welders and workshop teams can plan changeovers before gas becomes a delay.
Free Fabora Tool
Welding Gas Bottle Duration & Cost Calculator
Estimate how long a MIG or TIG gas bottle will last, what it costs per hour, and how many bottles you may need for a job.
ModesFlow rate mode and pressure estimate mode
UnitsL/min, CFH, litres, cubic feet, bar, psi, and US gallons
OutputsBottle duration, bottles needed, gas cost per hour, and job cost
Free Fabora tool
Bottle duration and gas cost planning
Built for welders, fabricators, and workshop or site teams that need a quick answer on bottle life, gas spend, and how many bottles a job may need.
- Flow rate mode for the cleaner estimate
- Pressure mode for rough planning only
- UK and US unit support in one tool
Use note
Built for estimating and planning
This calculator helps with practical gas planning. It is not positioned as engineering approval, welding procedure approval, or guaranteed gas usage.
Pressure mode is deliberately labelled as a rough estimate because pressure and flow are not the same thing at the torch.
Use the tool
How long will a welding gas bottle last?
Pick a region style, choose flow rate or pressure estimate mode, then add the bottle preset, job time, and bottle cost. Advanced fields stay available when you need them, but the default path is built as a quick practical estimate.
Quick estimator
Pick the basics and calculate
What it helps with
Practical bottle planning for workshop and site welding
This tool is aimed at the common day-to-day question: how long will this bottle last, what does that gas cost per hour, and how many bottles may be needed before the job is finished?
Good fit for
Planning
Bottle change planning for workshop welding, site work, and smaller job packs.
Costing
Quick gas cost checks before a quote, work order, or live job is issued.
Turn gas use into a practical hourly cost
Use the bottle cost, flow rate, and job time to get a simple planning figure for gas cost per hour and cost for the job.
Pressure mode still helps when flow is unknown
If the welder only knows the regulator pressure, pressure mode gives a rough planning figure by using an editable equivalent flow behind the maths.
Useful for both UK and US bottle habits
Work in litres, cubic metres, cubic feet, bar, psi, L/min, CFH, litres, or US gallons depending on how the bottle or regulator is normally described.
Pressure and units
Can I calculate welding gas usage from pressure?
Not exactly. Pressure on the regulator does not prove actual gas flow at the torch. That is why pressure mode is labelled as a rough estimate and uses an editable equivalent flow for the duration and cost maths.
What units does the welding gas calculator support?
Flow can be entered in L/min or CFH. Bottle size can be entered in litres, cubic metres, cubic feet, or estimated from water capacity and pressure using litres, US gallons, bar, and psi.
Is this suitable for MIG and TIG welding?
Yes. It is built for MIG / MAG, TIG, FCAW with shielding gas, and similar practical gas-shielded welding work where the main need is duration and cost planning.
Practical limitations
This is a planning calculator, not an approval or certification tool. Actual gas use varies with leaks, purge time, torch setup, starts and stops, wind, and real site or workshop conditions.
Fabora RAMS
Using welding gas on site?
Fabora RAMS helps you create editable welding RAMS with hot works, gas cylinder handling, fire risk, PPE and control measure sections already structured.
Tool FAQ
Short answers on flow, pressure, units, and data handling
These are the main points people usually want to check before using a quick gas planning calculator on a live welding job.
Related tools
Need another quick trade check? Try the Steel Weight Calculator, the Stock Cutting Optimiser, or go back to the full Fabora Tools page.
How do I calculate how long a welding gas bottle will last?
The simplest approach is bottle gas volume divided by gas flow rate. This tool converts everything to litres and litres per minute behind the scenes, then estimates duration, job gas needed, and cost from the figures you enter.
Can I use pressure instead of flow rate?
Yes, but only as a rough planning figure. Pressure is not the same as flow, so the calculator uses an editable equivalent flow when you choose pressure mode. If you know the real flow rate, that is the better input.
What is the difference between L/min and CFH?
They are two common ways of describing shielding gas flow. L/min means litres per minute. CFH means cubic feet per hour. This calculator can convert between them using practical workshop conversion figures.
Does this work for MIG and TIG welding?
Yes. It is suitable for MIG / MAG, TIG, FCAW with shielding gas, and similar work where you need a practical estimate on bottle life, gas cost per hour, or bottles needed for a job.
Does Fabora store my gas calculator data?
No. This calculator runs on the page only. Fabora does not save your entries to an account or database here.
Is this an engineering approval calculator?
No. This is a practical estimating and planning tool. It does not guarantee gas usage, compliance, approval, or welding procedure suitability.