A 20lb propane refill typically costs $15-$25 at a U.S. retailer, with an average near $20; prices vary with local propane rates and how much fuel the tank needs. A standard 20lb cylinder holds about 4.7 gallons when filled to its safe capacity, so the per-gallon rate and any minimum service charge affect the final price.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| 20lb cylinder refill | $15 | $20 | $25 | About 3.8-4.7 gallons, depending on remaining fuel |
| Propane rate | $3.25 per gallon | $4.25 per gallon | $5.25 per gallon | Retail rates vary by location and provider |
| 20lb tank exchange | $20 | $25 | $32 | Usually exchanges a cylinder for a prefilled one |
| New 20lb cylinder | $35 | $55 | $80 | Price depends on brand, condition, and included fuel |
What a 20lb Propane Refill Usually Costs
For a refill at a hardware store, gas supplier, or propane retailer, a typical customer pays $15-$25 for a standard cylinder. A near-empty tank costs more to fill than one that still contains fuel because the customer pays for the gallons added, not a flat price for a full tank.
Budget about $20 for a routine refill in an average-cost market. This estimate assumes a refillable, serviceable cylinder, regular business hours, and no delivery charge. Rural locations, high-demand periods, and areas with higher fuel and operating expenses may exceed the range.
Assumptions: Standard 20lb grill cylinder, walk-in refill, ordinary access, and no tank repair or delivery.
How Propane, Labor, and Service Charges Shape the Bill
Most walk-in refill prices mainly reflect the propane dispensed, while some providers set a minimum charge or include service costs in their posted rate. The following ranges are broad retail estimates rather than a universal fee schedule.
| Quote component | Typical range | How it affects the total |
|---|---|---|
| Propane added | $3.25-$5.25 per gallon | Usually the main charge; a full fill is about 4.7 gallons |
| Filling service | $0-$5 per cylinder | May be included or listed as a separate fee |
| Minimum charge | $10-$18 per visit | Can matter when a tank needs only a small top-up |
| Delivery | $10-$30 or more | May include a minimum order or distance charge |
| Inspection or valve service | $0-$25 | Applies only if the cylinder needs inspection or service |
Ask whether the quoted rate includes a minimum charge and taxes. For an on-site service visit, labor can be billed by time, but most small-cylinder refills are priced as a walk-in transaction rather than a separate hourly job.
Why Tank Fill Level and Cylinder Condition Change the Price
A 20lb cylinder is named for its approximate propane capacity by weight, not for a guaranteed volume dispensed at every visit. Propane tanks are filled to roughly 80% of their water capacity to leave room for expansion; a standard 20lb cylinder generally takes about 4.7 gallons when nearly empty.
Remaining fuel is the biggest reason two customers can pay different amounts at the same per-gallon rate. A tank that takes 3 gallons at $4.25 per gallon costs $12.75 before any fees, while a near-empty tank taking 4.7 gallons costs about $20. A provider may refuse a cylinder with a damaged valve, severe rust, or an expired qualification date.
Tank size also matters: a 30lb cylinder can hold more propane and cost more to refill, while a small 1lb disposable bottle is not normally handled like a refillable grill cylinder. Never assume a 20lb cylinder is empty based on its weight alone; the tank tare weight varies and is stamped on the collar.
Refilling a 20lb Tank Versus Buying an Exchange
Refilling is often the lower-cost choice when the customer owns a sound cylinder and the retailer charges by the gallon. Exchange cages offer convenience, but the price generally covers a replacement cylinder with a specified fill, and the customer gives up the tank brought in.
| Option | Typical price | Fuel or service detail |
|---|---|---|
| Walk-in refill | $15-$25 | Pay for fuel added, up to about 4.7 gallons |
| Tank exchange | $20-$32 | Replacement tank may contain less than 20lb |
| New cylinder purchase | $35-$80 | Check whether the sale includes propane |
Compare the actual propane weight, not just the exchange sticker price. Exchange tanks may be labeled with a 15lb fill, so a customer can pay more per gallon than with a full refill even when the total checkout price appears similar.
How Local Propane Rates Affect 20lb Refill Prices
Retail prices can differ substantially across states and even between nearby stores. Urban locations may have higher operating costs, while rural retailers may have fewer competitors or charge more to cover transport. Seasonal demand can also raise local rates when grilling, camping, or heating use increases.
Use a local per-gallon quote to compare providers fairly. As a practical estimate, a 4.7-gallon fill at $3.50 per gallon is about $16.45; at $5 per gallon it is $23.50, before separate charges. Posted prices may exclude taxes or apply only to larger purchases, so confirm the 20lb-cylinder rate by phone.
There is no reliable nationwide regional percentage that applies to every retailer. A nearby supplier’s current quote is more useful than a state average, especially when delivery, cylinder inspection, or a minimum transaction changes the bill.
When Delivery or Tank Problems Add Extra Charges
Most customers avoid added labor costs by bringing a cylinder to the filling station. Home delivery for one 20lb tank can add $10-$30 or more, and some companies require a minimum order that makes a small delivery uneconomical. Ask whether delivery pricing includes the refill or is charged separately.
A cylinder that fails inspection may cost more to replace than to refill. A new tank commonly costs $35-$80, with premium finishes or included propane affecting the shelf price. A retailer may also decline a cylinder with a damaged valve, visible leakage, or severe corrosion rather than fill it for an extra fee.
Allow extra time during weekends and peak summer periods. Busy filling stations may have a queue, but standard walk-in service usually does not require booking. If a business offers cylinder recertification or repairs, request a separate quote before approving work.
Ways to Lower the Cost of Each 20lb Refill
Compare at least two nearby retailers using the price per gallon and any minimum charge. A low advertised rate can be less attractive if the provider adds a service fee, while a flat refill price may be a better deal for a nearly empty tank.
- Refill a sound owned cylinder instead of exchanging it when the per-gallon math is lower and the tank is accepted.
- Bring multiple cylinders in one trip if the provider has a minimum charge or travel expense.
- Check the tank’s remaining fuel before going, so a small top-up does not trigger a costly minimum.
- Keep the cylinder protected from damage and corrosion to avoid replacement expense.
- Confirm any posted price applies to a 20lb refill and reflects the amount of propane actually supplied.
For example, if a refill station charges $4 per gallon plus a $3 service fee, a 4.7-gallon fill totals about $21.80 before tax. An exchange priced at $24 may cost more and provide less fuel; the best option depends on the fill amount and the tank’s condition.