Costco propane tank price depends on whether a location offers refills, what size cylinder is being filled, and local per-gallon rates. A typical 20-pound tank refill costs about $12-$20, while buying a new grill cylinder usually costs $40-$70; Costco availability and pricing vary by warehouse.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| 20-pound tank refill | $12 | $16 | $20 | Usually priced per gallon; station availability varies |
| 20-pound tank exchange | $20 | $23 | $28 | May be handled by a third-party exchange service |
| New 20-pound cylinder | $40 | $55 | $70 | Retail estimate; Costco stock and offers vary |
| Propane refill rate | $2.50/gal | $3.25/gal | $4.00/gal | Illustrative U.S. range, not a fixed Costco rate |
What Costco charges to refill a 20-pound propane tank
Where a Costco propane station is available, refills are generally charged by the gallon rather than as a flat fee per tank. A standard 20-pound grill cylinder holds about 4.7 gallons when filled to its safe capacity, so a $2.50-$4.00-per-gallon rate works out to roughly $12-$19 for a full fill. The actual charge depends on how much propane the cylinder needs.
Budget about $12-$20 for a typical 20-pound refill, but verify the current rate and service at the specific warehouse. Costco does not publish one universal rate for every location, and not every warehouse has a propane station. Assumptions: standard refillable grill cylinder, ordinary fill, no cylinder purchase.
How propane, labor, and cylinder charges shape the quote
Most refill transactions are simpler than a delivery or appliance installation: the main charge is propane, and the customer usually transports the tank to the station. If a location or local provider charges additional fees, confirm them before filling. New-cylinder purchases and exchanges include the container or service arrangement, so their totals should not be compared directly with a refill alone.
| Quote component | Typical range | What it covers | When it applies |
|---|---|---|---|
| Propane | $2.50-$4.00 per gallon | Fuel dispensed by volume | Refill stations |
| 20-pound refill total | $12-$20 | About 4.0-4.7 gallons | Tank is partly or nearly empty |
| New cylinder | $40-$70 | Empty or propane-ready grill tank | First tank or replacement |
| Exchange service | $20-$28 | Full replacement cylinder for an eligible empty tank | Participating exchange kiosks |
For a refill, the per-gallon price and amount dispensed matter more than a quoted “tank price.” A refill typically avoids paying for another cylinder, while an exchange may provide convenience at a higher cost per gallon.
Tank size and fill level change the propane total
A 20-pound cylinder holds approximately 4.7 gallons, a 30-pound cylinder about 7.1 gallons, and a 100-pound cylinder about 23.6 gallons at a full safe fill. At $2.50-$4.00 per gallon, those capacities imply roughly $12-$19, $18-$28, and $59-$94, respectively. These are capacity-based estimates, not guaranteed invoices: a partly full tank takes less fuel, and some retail stations may have limits or may not serve larger cylinders.
Tank size creates a predictable difference, but the amount already in the cylinder determines the actual refill bill. A tank should be in date, undamaged, and approved for refilling; a station may decline a cylinder that fails inspection or has an expired qualification date.
Does Costco refill tanks or offer propane exchanges?
Costco’s propane service is location-specific. Some warehouses operate refill stations, while others do not offer propane service; exchange availability can also depend on a third-party kiosk or local arrangement. A refill station adds propane to a customer’s own eligible cylinder. An exchange trades an accepted empty cylinder for a full one, commonly without returning the same tank.
Check the warehouse directly before loading a tank into the vehicle. Ask whether the station is open, what cylinder sizes it accepts, how payment works, and whether it performs refills or exchanges. Membership and payment requirements may differ by location, so online national averages cannot confirm a particular warehouse’s policy.
Regional propane rates can shift a Costco refill estimate
Propane prices vary with wholesale supply, transportation distance, taxes, and local competition. As a broad planning estimate, urban and high-cost coastal markets can run about 10%-25% above lower-cost inland areas; remote locations may also charge more because delivery and supply costs are higher. These are general market differences, not a Costco surcharge schedule.
Use the local station’s posted per-gallon rate rather than a national average when comparing offers. A warehouse near a bulk propane supplier may price differently from a location with fewer nearby suppliers. Seasonal demand can also affect market rates, especially when cold-weather heating competes for propane supply.
Three common Costco propane trips and their likely totals
A nearly empty 20-pound grill tank filled at $3.25 per gallon would cost about $15 if it takes 4.7 gallons. A 30-pound cylinder filled at the same rate could cost about $23 for 7.1 gallons. An empty 20-pound tank exchanged for a full one at a nearby kiosk might cost $20-$28, depending on the provider and local pricing.
Comparing the same tank size and service type makes quotes meaningful. For example, comparing a refill total with an exchange price can mislead because the exchange includes a full cylinder and may include the convenience of a kiosk. The exact bill changes with fuel level, local rate, and service terms.
When a new tank or exchange costs more than refilling
A new 20-pound cylinder commonly costs about $40-$70 at retail, while a larger or premium cylinder can cost $60-$120 or more. A refillable tank can be economical over repeated uses if it is safe and accepted at a nearby station. An exchange can make sense when a tank is damaged, out of date, or not refillable, but the customer should check the cylinder condition and exchange provider rules.
Do not refill a tank that is leaking, badly rusted, or rejected by the station. Cylinder inspection or replacement is a safety decision as well as a budget decision. If a retailer sells a new tank with propane included, check whether the quoted price covers the cylinder, the initial fill, or both.
How to keep a Costco propane tank bill lower
Call ahead to compare the warehouse’s per-gallon rate with nearby refill stations, and check whether a Costco membership is required for that service. Bring a refillable cylinder that is eligible and in good condition, since replacing a usable tank adds a larger one-time expense. If choosing between refill and exchange, compare the total paid and the amount of propane provided, not just the checkout price.
For labor-based delivery or installation rather than a self-service station, charges may be substantially different; a local provider could add delivery, minimum-order, or service fees. is relevant only when paid labor is part of the job, not for a basic walk-up refill.
The most reliable savings usually come from refilling a sound tank and checking local rates before making the trip. Avoid buying a replacement cylinder just to access a station unless the existing tank is unsafe, expired, or not accepted.