Welding oxygen cylinder refill cost is usually somewhere between about $15 and $80 per fill in the United States, depending on cylinder size, supplier and whether you refill your own cylinder or swap it. We could not verify a current national price list, so treat that range as a rough guide and call two or three local welding-gas suppliers for a quote. Hydrostatic testing, valve repair and rental fees can add to the total.
Quick Answer
- Rough range: about $15 to $80 per refill, with small cylinders at the low end and 125 cu ft cylinders at the high end.
- Your price depends on the supplier, local market, cylinder size and account status.
- Extra fees can include hydrostatic testing, valve work, delivery, and rental or demurrage charges.
- Always get the price in writing and ask whether it is a refill of your own cylinder or an exchange.
Welding Oxygen Cylinder Refill Cost by Size
Welding oxygen is sold in several common cylinder sizes, often called 20, 40, 80 and 125 cubic feet (cu ft or CF). Larger cylinders hold more gas, cost more per fill, and usually cost less per cubic foot.
| Cylinder size | Typical use | Price pattern |
|---|---|---|
| 20 cu ft | Light, portable cutting and hobby work | Lowest cost per fill, highest cost per cubic foot |
| 40 cu ft | Small shop and occasional cutting | Low cost per fill |
| 80 cu ft | Regular shop or mobile cutting | Mid-range cost per fill |
| 125 cu ft | Higher-volume cutting and heating | Highest cost per fill, lowest cost per cubic foot |
Exact prices depend on your supplier. We left specific dollar amounts out of the table because quotes vary too much from shop to shop and we could not confirm current numbers.
What Changes the Refill Price
- Supplier type: national gas companies, independent welding shops and farm-supply stores price differently.
- Cylinder ownership: refilling a cylinder you own is often priced differently from exchanging for a supplier-owned cylinder.
- Location: local competition, delivery distance and regional demand all move prices.
- Account status: business accounts and regular customers may get negotiated rates.
- Gas grade: industrial welding oxygen and medical oxygen are different products with different handling rules and prices.
Fees Beyond the Refill: Testing, Valves and Rental
Oxygen cylinders must be in test date before a supplier will fill them. In the United States, steel cylinders generally need a periodic hydrostatic test, commonly every 5 or 10 years depending on the cylinder’s specification and markings. Check the date stamped on the cylinder and ask the supplier what they charge to test it.
- Hydrostatic testing: charged per cylinder, and sometimes bundled into a refill or lease program. Ask for the price before you drop the cylinder off.
- Valve repair or replacement: a leaking or damaged valve may need service before the cylinder can be filled.
- Rental or lease: if the supplier owns the cylinder, expect a recurring rental or lease charge on top of the gas.
- Delivery and hazmat fees: some suppliers add a fee for delivery or small orders.
A cylinder that fails inspection or testing may have to be retired, which means buying or leasing a replacement.
Refill vs Exchange: Which Costs Less?
With a refill, the supplier fills the cylinder you bring in. With an exchange, you swap your empty for a full cylinder of the same size. Exchange is usually faster and may skip testing delays, while a refill of your own cylinder can be cheaper per use if the supplier accepts it.
- Ask whether the supplier will refill cylinders that you own, or only exchange.
- Confirm the size and type of the replacement cylinder before you swap.
- Compare the total price, including any exchange or handling fee, not just the gas price.
How to Calculate Welding Oxygen Cost per Hour
Divide the cylinder volume by your flow rate to find run time, then divide your refill price by the hours.
Run time (hours) = cylinder cu ft ÷ flow rate in CFH. Cost per hour = refill price ÷ run time.
Example with a made-up price: if a supplier quotes $40 for an 80 cu ft fill and you run the torch at 20 CFH, the cylinder lasts 4 hours, so the gas costs about $10 per hour. At 10 CFH the same cylinder lasts 8 hours and costs about $5 per hour. Real runtime is shorter because of purging, leaks and heating time. Cutting torches draw oxygen unevenly, so use these numbers only as a planning estimate.
Where to Buy or Refill Welding Oxygen
Start with local welding-gas distributors, national industrial gas companies and welding supply stores. Call at least two suppliers and ask:
- What is the price to refill or exchange my cylinder size?
- Do you accept cylinders bought elsewhere?
- Are testing, rental, delivery and hazmat fees included?
- Do you offer an account or volume discount?
- What proof of ownership or test date do you require?
Ways to Lower Your Oxygen Cost
- Use the largest cylinder you can store and move safely, since larger cylinders usually cost less per cubic foot.
- Compare quotes from more than one supplier, and ask about account or volume pricing.
- Fix leaks, turn the cylinder valve off when you stop, and set the flow no higher than the job needs.
- Track your cutting hours so you buy the right size.
Safety: Do not try to refill or transfill oxygen cylinders yourself. Oxygen makes fires burn much hotter, so keep cylinders upright and secured, keep valves and regulators free of oil and grease, store oxygen away from fuel gases and combustibles, and use valve caps when moving them. See OSHA’s oxygen-fuel gas welding standard.
Related Welding Gas Cost Guides
- Welding Oxygen Refill Costs: Factors, Prices, and Savings Tips
- How Much Does a Welding Oxygen Bottle Cost?
- 65 Cu Ft Oxygen Cylinder Cost: Buy, Lease or Rent
- Welding Gas Refill Costs
Frequently Asked Questions
How much does it cost to fill a welding oxygen tank?
A rough range is about $15 to $80 per fill depending on size and supplier. Call local welding-gas suppliers for a current quote, and ask whether testing, rental or delivery fees are extra.
Is it cheaper to refill or exchange an oxygen cylinder?
It depends on the supplier. Refilling your own cylinder can be cheaper per use, while exchange is faster and avoids testing delays. Compare the total price including any handling or exchange fee.
How often does an oxygen cylinder need hydrostatic testing?
Steel cylinders generally need a hydrostatic test every 5 or 10 years depending on their specification and markings. Check the stamped date and ask the supplier, since a cylinder out of test date will not be filled.
Can I transport a filled oxygen cylinder myself?
Individuals commonly transport welding cylinders, but the rules for hazardous materials, vehicle securement and quantity limits apply. Secure the cylinder upright, fit the valve cap, keep it out of a closed passenger cabin, and check local rules.
Can I refill an oxygen cylinder at home?
No. Oxygen should be filled only by a qualified gas supplier. Home or improvised transfilling is dangerous because of the fire and pressure risks.
Are medical and welding oxygen the same?
They are sold under different grades and handling rules. Use welding-grade oxygen for cutting and welding, and follow your supplier’s guidance on which grade suits your use.
