Refilling a standard 20-pound propane cylinder typically costs $15-$25, while exchanging one usually costs $20-$30. The price depends on local propane rates, how much gas goes into the tank, retailer fees, and whether the cylinder is in safe, exchangeable condition.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Refill, 20-pound cylinder | $15 | $20 | $25 | Usually priced by gallons dispensed |
| Exchange, 20-pound cylinder | $20 | $25 | $30 | Commonly provides about 15 pounds of propane |
| Refill rate | $3.00/gal | $4.00/gal | $5.00/gal | About 4.7 gallons for a full 20-pound fill |
| New 20-pound cylinder | $35 | $50 | $70 | Tank purchase, generally before propane |
Assumptions: standard grill cylinder, ordinary access, and typical U.S. retail service; local rates and tank condition change the estimate.
What a 20-pound propane refill or exchange costs
A refill station generally charges by the gallon, and a 20-pound cylinder holds about 4.7 gallons when filled to its permitted capacity. At $3-$5 per gallon, that works out to roughly $14-$24 before any minimum charge or service fee. Many retailers land near $20 for a typical refill.
Exchange cages usually charge a set fee rather than measuring the customer’s remaining propane. A typical exchange costs $20-$30 and provides a cylinder filled with around 15 pounds, or about 3.5 gallons. Refilling is usually less expensive per pound when the existing cylinder can be filled to capacity.
Prices may differ because an exchange includes access to a replacement cylinder and its inspection or requalification service. Exchange labels often say 20 pounds because that is the cylinder size, not necessarily the amount of propane inside.
How propane, labor, and tank fees shape the bill
| Quote component | Refill range | Exchange range | What affects it |
|---|---|---|---|
| Propane | $14-$24 per 20-pound fill | Included in $20-$30 price | Local per-gallon rate and fill amount |
| Service or handling | $0-$5 per visit | Usually included | Retailer policy and minimum charge |
| Tank inspection or certification | $0-$10 if needed | Usually included in exchange price | Tank condition and certification date |
| New cylinder | $35-$70 | May be required for first exchange | Tank purchase, not a standard refill charge |
Refill labor is often built into the per-gallon price, rather than billed separately. Where a business does charge for staff time, a brief fill might add about $5-$15. A delivery charge for propane service is separate from a walk-in cylinder refill and may cost $10-$30 or more.
Check whether the posted refill price includes a minimum fee and whether the amount charged is based on gallons delivered. Some locations have a minimum transaction, so a nearly full cylinder may cost more per added gallon than a low tank.
Why fill amount, tank condition, and size change the quote
A refill’s total depends on how much propane the cylinder needs. A nearly empty standard cylinder may take close to 4.7 gallons, while a half-full one needs about half that amount. The tank’s size matters too: 20-pound grill cylinders are common, while 30-pound and 40-pound cylinders hold more and cost more to fill.
Tank safety can affect whether a refill is available at all. Cylinders generally require requalification 12 years after manufacture, then at intervals set by the applicable certification method. A damaged, leaking, badly rusted, or out-of-date cylinder may be refused. An exchange can be a practical alternative if the retailer accepts the old tank, though damaged cylinders may also be rejected.
Temperature and the cylinder’s overfill prevention device limit the safe fill; a 20-pound cylinder is not filled with 20 pounds of liquid propane. Compare the delivered propane by weight, not just the tank size printed on the label.
Refill versus exchange value per pound of propane
At an average refill price of $20 for roughly 20 pounds, the effective cost is about $1.00 per pound. An average $25 exchange containing 15 pounds works out to about $1.67 per pound. Actual refill weight can be lower if the cylinder was not empty or the station stops at a safe fill level.
For someone who already owns a current, serviceable tank and has convenient access to a filling station, refilling often offers better value. Exchange may cost less in time and effort, and it supplies a different cylinder without waiting for a refill attendant. For a fair comparison, divide the price by the propane weight actually received.
How regional propane rates affect cylinder prices
Retail cylinder prices vary with local propane supply, transportation distance, competition, and store policies. In areas with several refill stations, a refill may run 5%-15% below the national midpoint. Remote markets or high-cost metro areas can be 10%-25% higher, especially when only one convenient seller offers fills.
Exchange prices are often less variable because retailers use a set per-cylinder charge, but they still differ by brand and location. Rural customers may save on the exchange itself yet face a longer drive. Compare two or three nearby prices using the same tank size and the same propane weight.
When an exchange adds fees or saves a trip
Some stores require a first-time customer to pay for a cylinder before the exchange price applies. A new tank with propane can total $50-$90, depending on the cylinder and retailer; subsequent exchanges are commonly $20-$30. Refill businesses may have minimum charges, while convenience-store exchange cages typically do not list a separate handling fee.
Delivery is usually not economical for one grill cylinder. If a propane supplier offers cylinder pickup or delivery, ask about route charges, minimum quantities, and whether the tank must be certified. Include travel and any first-tank purchase when comparing the actual cost of getting propane.
How to lower the next 20-pound cylinder bill
Call nearby refill locations for their per-gallon price, minimum fee, and accepted cylinder sizes before driving over. Weighing a cylinder before and after service can help verify how much propane was added; its stamped tare weight identifies the empty tank weight. Avoid comparing a full refill with an exchange that contains less propane.
Keep a reusable cylinder in good condition and check its certification date before it becomes urgent to replace. If an exchange is necessary, compare the stated propane weight across brands. Bundling several cylinders into one supplier visit may reduce per-trip costs where delivery is available, but confirm minimum order fees first.
The lowest practical price is usually a local refill quote with a clear per-gallon rate and no unexpected minimum charge. Exchange can still make sense when convenience, tank eligibility, or time matters more than the per-pound savings.