How Much Does it Cost to Fill a Propane Tank?

Updated on June 23, 2026 | Written by Alec Pow
This article was researched using 10 sources. See our methodology and corrections policy.

Filling a propane tank usually costs $12 to $25 for a standard 20 lb grill cylinder at a refill station, while a propane exchange usually costs $20 to $30 and often gives you less propane. Large residential tanks are priced by the gallon, so the bill depends on your local delivered propane rate, how empty the tank is, delivery fees, seasonal demand, and whether the supplier adds safety or fuel surcharges.

The latest visible U.S. residential propane average from the Energy Information Administration is $2.674 per gallon for March 30, 2026, excluding taxes. EIA also notes that weekly heating oil and propane prices are collected during the October-through-March heating season, with April-through-September prices collected only once per month. That means summer articles should use EIA as a benchmark, then tell readers to call local suppliers for the current pump or delivered rate.

For a quick mental estimate, multiply the gallons going into the tank by your local propane price, then add any delivery, HazMat, safety, minimum-order, leak-check, or exchange fees. A grill cylinder is a small purchase. A residential delivery can become a winter heating bill.

How Much Does It Cost to Fill a Propane Tank?

A small propane tank refill is usually a $12 to $25 (at $30 per hour, earning that amount would take about 24 to 50 minutes, before taxes) errand. A residential propane delivery is usually a few hundred dollars to more than $1,000, depending on tank size and how many gallons are delivered.

The cleanest way to estimate the bill is:

Gallons delivered × local propane price per gallon + fees = total refill cost.

A 20 lb grill tank does not take 20 gallons. It takes roughly 4.6 to 4.7 gallons when properly filled. A 100 lb cylinder holds about 23 gallons. A 500-gallon home tank normally holds about 400 usable gallons because of the 80% fill rule.

These are refill estimates, not tank purchase or installation prices. A 500-gallon tank has its own buying, rental, trenching, regulator, line, permit, and installation costs, so it deserves a separate article.

20 lb Propane Tank Refill vs Exchange

For a grill tank, refilling usually gives the better value. You pay for the actual propane dispensed, and you can top off a tank that still has some fuel left. Exchange is faster and more convenient, but it usually costs more per pound of propane.

U-Haul explains that many propane exchange programs fill 20 lb tanks to about 15 lb, while refilling can give you more propane. That difference is easy to miss because the cage still says “20 lb tank,” even if the exchanged cylinder is not filled to 20 lb.

Here is the practical comparison:

A current retail example shows the convenience premium. Home Depot listed an AmeriGas propane tank exchange at $20.97, while an empty new tank purchase was listed around $65 at the same time. Local store prices can vary, but that gives a useful real-world exchange-price anchor.

Refill is not always possible. If the cylinder is expired, badly rusted, dented, missing parts, or fails inspection, a refill station should refuse it. In that case, an exchange may be the cheaper way to get a safe, usable cylinder.

Propane Refill Cost by Tank Size

Tank names can be confusing because portable tanks are often labeled by pounds, while home tanks are usually labeled by gallons. Ferrellgas lists common capacities this way: a 20 lb tank holds up to 4.7 gallons, a 30 lb tank holds 7 gallons, a 100 lb tank holds 23 gallons, and a 500-gallon tank holds 400 gallons.

That explains why a small tank may cost more per gallon than a home delivery. Grill cylinders are sold at retail locations with labor and convenience baked in. Residential deliveries use larger volumes but may add delivery and account fees.

How Much Does It Cost to Fill a Residential Propane Tank?

Residential propane tanks are usually filled by truck delivery. A supplier checks the gauge, delivers the gallons needed, and bills the customer by the delivered gallon plus any account or delivery fees.

A residential tank is not usually filled to 100%. If your 250-gallon tank is sitting at 30%, the delivery is not 250 gallons. The supplier may bring it up to 80%, which means the delivered amount is the difference between the current level and the safe fill level.

Worked examples:

• 100-gallon tank from 20% to 80%: about 60 gallons delivered. At $2.674 per gallon, fuel is about $160 before fees.
• 250-gallon tank from 30% to 80%: about 125 gallons delivered. At $2.674 per gallon, fuel is about $334 before fees.
• 500-gallon tank from 20% to 80%: about 300 gallons delivered. At $2.674 per gallon, fuel is about $802 before fees.
• 500-gallon tank from empty to 80%: about 400 gallons delivered. At $2.674 per gallon, fuel is about $1,070 before fees.

These examples use the national benchmark only. A rural winter delivery in a high-cost region can be much higher. A summer route-fill in a competitive market can be lower.

Propane Tanks Are Filled to 80%

Propane expands when temperature rises, so tanks need extra space inside for safety. AmeriGas explains that propane containers are filled to only 80% of capacity to leave room for expansion as temperatures change.

That is why a 500-gallon tank does not hold 500 gallons of usable propane. Its normal usable capacity is about 400 gallons. A 120-gallon tank holds about 96 gallons. A 100-gallon tank holds about 80 gallons.

This also explains why a gauge reading can shift with weather. The same propane can take up more space on a hot day and less space on a cold day. The fuel did not disappear or multiply. The liquid expanded or contracted.

Real-Life Cost Examples

Example 1: Backyard grill tank refill

A 20 lb tank is nearly empty and takes 4.5 gallons. The local refill station charges $3.49 per gallon.

• 4.5 gallons × $3.49 = $15.71
• Small station fee: $1.00
• Total: $16.71

That same household might pay $20 to $30 at an exchange cage and receive less propane. If they grill often, refill is usually the better deal.

Example 2: RV owner with two 30 lb cylinders

Each 30 lb cylinder takes about 6.5 gallons because neither tank is completely empty. The station charges $3.25 per gallon.

• 13 gallons × $3.25 = $42.25
• No exchange fee, because the customer refilled owned cylinders.
• Total: $42.25

The important part is that the customer paid for the gallons actually dispensed, not two flat-rate swaps.

Example 3: 100-gallon residential tank

A small residential tank is at 25% and gets filled to 80%. That means about 55 gallons are delivered.

• 55 gallons × $2.95 local delivered rate = $162.25
• HazMat or safety fee: $14.99
• Fuel recovery or delivery charge: $16.49
• Total: $193.73

This is why the per-gallon price alone is not the whole invoice.

Example 4: Midwinter home delivery

A household with a 500-gallon tank orders a top-off from 35% to 80%. That is about 225 gallons.

• 225 gallons × $3.10 local winter rate = $697.50
• Delivery and safety fees: $30 to $60
• Total: about $728 to $758

This is a refill example only. Buying or installing the 500-gallon tank is a separate cost.

Propane Refill Cost Breakdown

Base propane price. This is the price per gallon. It changes by region, season, delivery method, wholesale market, and supplier.

Station or retail markup. A grill-cylinder refill at a retail location can cost more per gallon than a residential truck delivery because the station pays for equipment, labor, inspection time, and convenience.

Exchange convenience premium. Exchange tanks are fast, available at many retailers, and useful if your old tank is expired or damaged. They usually cost more per pound of propane than refilling.

Delivery fee. Residential deliveries may include route, fuel, or delivery-related charges. Some suppliers include this in the per-gallon rate, while others show it as a line item.

HazMat or safety compliance fee. AmeriGas lists a Hazmat & Safety Compliance Fee of $14.99 per delivery and a monthly fuel recovery fee. Exact fees vary by supplier, but this is a good reminder that residential propane invoices may contain more than fuel.

Leak check or safety inspection. A supplier may require a leak check after an interruption of service, new account setup, new appliance work, or empty tank situation.

Tank rental or minimum-use fee. If the supplier owns the residential tank, the customer may pay rental or minimum-use charges, especially if annual consumption is low.

Taxes. State and local taxes may apply depending on jurisdiction and use.

What Changes Propane Refill Prices?

Several forces affect the final propane bill.

• Season: demand rises in winter because many rural homes heat with propane. Summer fills can be cheaper or at least easier to schedule.
• Region: EIA data shows wide regional differences. The Northeast and parts of the East Coast often run higher than the Midwest.
• Delivery size: a small delivery can carry more fee pressure than a large delivery.
• Supplier competition: more local suppliers usually means better quote pressure.
• Account type: will-call, automatic delivery, budget plan, pre-buy, rental tank, or customer-owned tank can all change the annual total.
• Tank condition: old, expired, rusty, or damaged cylinders can be refused.
• Weather: cold snaps can increase local demand and make delivery schedules tighter.
• Access: difficult driveways, locked gates, snow, long hose pulls, or off-route dispatch can add cost or delay delivery.

The cheapest per-gallon quote is not always the cheapest annual setup. Ask for the full fee schedule before switching suppliers.

A Propane Tank May Be Refused

Refill stations do not have to fill every cylinder. They should inspect portable propane tanks before filling.

Tractor Supply says 20 lb grill cylinders hold about 4.6 gallons, refill prices vary by local propane price, cylinders must pass visual inspection, and expired tanks may be refused. It also notes that 100 lb cylinders must be transported upright and cannot be brought in an enclosed vehicle for refill.

A refill station may refuse a cylinder if:

• The certification date is expired.
• The tank is badly rusted, dented, burned, gouged, or damaged.
• The valve is defective or leaking.
• The collar or foot ring is damaged.
• The tank cannot be safely grounded or weighed during filling.
• The customer tries to transport a large cylinder unsafely.

AmeriGas explains that portable propane tanks generally need recertification between 5 and 12 years based on the manufacture date and other factors. If your grill cylinder is out of date, exchanging it can be simpler than finding a recertification location.

You might also like our articles about the cost of a Blue Rhino propane tank, an acetylene tank refill, or propane tank recertification.

Ways to Spend Less

Start with the refill option if your cylinder is still safe and in date. A 20 lb refill usually beats an exchange on price per pound.

For residential tanks, call at least two suppliers before the heating season. Ask for the delivered price per gallon, delivery fees, HazMat or safety fees, minimum delivery amount, tank rental terms, leak-check charges, and whether the quote is introductory.

Other ways to reduce the annual cost:

• Fill before winter demand rises. Summer or early fall fills can reduce pressure from cold-weather spikes.
• Ask about budget billing. It may not lower the total, but it can smooth cash flow.
• Compare pre-buy or price-cap programs. These can help when winter price swings worry you.
• Own your residential tank if it makes sense. Ownership can let you shop suppliers, but it adds maintenance responsibility.
• Avoid emergency deliveries. Keep an eye on the gauge and order before the tank gets too low.
• Use automatic delivery carefully. It prevents runouts, but make sure you understand the supplier’s price and fees.
• Do not exchange a half-full tank. Exchanges rarely credit leftover propane.
• Check cylinder dates before grilling season. An expired tank can turn a cheap refill trip into a more expensive exchange.

The best question is not “Who has the cheapest propane today?” It is “What will this supplier cost me over the whole season?”

Propane Safety Notes

Safety can affect the bill because propane suppliers may require inspections, recertification, safe access, and proper transport before filling.

For portable cylinders:

• Transport cylinders upright and secured.
• Do not leave a propane cylinder in a hot closed vehicle.
• Do not store cylinders indoors, in basements, or near ignition sources.
• Do not try to repair valves or refill disposable 1 lb cylinders unless you are using a product specifically designed and legally approved for that purpose.
• Do not ask a station to fill a damaged or expired cylinder.

For residential tanks:

• Keep the delivery path clear.
• Do not bury, move, or modify a tank without the supplier or qualified technician.
• Ask for a leak check if the system has been shut off, altered, or run empty.
• Call the supplier immediately if you smell propane.

A cheap refill is not worth a safety problem. Propane is efficient and common, but it must be handled like a pressurized fuel.

Answers to Common Questions

Refill estimates in this article use EIA’s latest visible U.S. residential propane benchmark from March 30, 2026, then adjust for common retail and delivery realities. Small-cylinder refill prices often run above the EIA residential benchmark because refill stations include labor and convenience in the pump price. Residential tank examples show fuel-only math first, then explain fees separately. Local prices, taxes, supplier contracts, delivery route, tank ownership, and season can change the final invoice.