How Much Does it Cost to Fill a Propane Tank?

Last Updated on September 24, 2025 | Prices Last Reviewed for Freshness: January 2026
Written by Alec Pow – Economic & Pricing Investigator | Content Reviewed by CFA Alexander Popinker

Educational content; not financial advice. Prices are estimates; confirm current rates, fees, taxes, and terms with providers or official sources.

People check the cost to fill a propane tank when the grill sputters, a delivery schedule shows up, or winter is on deck. You want a clear estimate, you want to know what drives the bill, and you want to dodge surprise fees. This guide maps real price bands, what changes them, and smart ways to save without cutting safety corners.

Dial your expectations to tank size, refill method, and location. A 20 lb cylinder for a BBQ behaves very differently from a 500-gallon residential tank, and an exchange kiosk is not the same as a refill station. Price per gallon matters, but so do fees, add-ons, and timing. The aim is simple. Pay only for the propane and service you actually need.

Article Highlights

• Recent U.S. residential averages from the EIA sit near $2.40–$2.75 per gallon.
• Refilling a 20 lb cylinder often totals $10–$15, while exchanges run $20–$25 for less propane.
• Plan $600–$1,600 for a 500-gallon residential top-off depending on market and fees, per HomeAdvisor.
• Summer fills and pre-buy programs can smooth winter spikes.
• Verify cylinder fill volume, target 4.7 gallons for 20 lb tanks at refills.

How Much Does it Cost to Fill a Propane Tank?

Filling a 20-pound propane tank in the US typically costs between $25 and $35 in total, which includes a service fee of $15 to $25 plus the current per-gallon propane price. Larger tanks such as 30-pound and 40-pound versions can cost from $35 to $65 per fill-up, while 100-pound bulk tanks can cost anywhere from $60 to $150 or more due to additional labor and delivery fees.

Thumbtack also reflects similar pricing, stating the national average refill cost for a 20 lb. tank is around $25 to $35. Pricing depends on location, with service fees and propane fuel costs combining to make up the total price.

Propane HQ reports that Tractor Supply Company charges about $3.79 to $4.15 per gallon of propane in 2025. This translates to roughly $17.81 to $19.55 to refill a standard 20-pound tank, neither including extra service fees. Tractor Supply refills tanks up to 100 pounds with no minimum refill quantities and no additional service charges for operations like purging.

Wendt’s Propane and Oil adds that fuel price fluctuations, service fees, and tank size greatly affect propane refill prices. They highlight that large bulk propane tanks usually require truck delivery, making prices higher due to labor costs. Consumers are advised to shop around and inquire about bulk discounts or loyalty programs for better rates.

Start with the going rate for fuel. National residential averages for delivered propane have recently tracked around $2.40–$2.75 per gallon, though rural delivery, add-ons, and winter spikes can push higher in cold regions, based on the EIA weekly series. Retail price forecasts for the 2025 heating season point to steady demand and modest volatility driven by crude oil and natural gas dynamics, per Foster Fuels.

Translate that into common tank sizes. A 20 lb cylinder at a refill station usually takes 4.0–4.7 gallons, so at $2.60 per gallon a typical fill lands near $10–$12. Kiosk exchanges charge a flat price, often in the low-$20s, and the cylinder often contains 15 lb of propane, so convenience carries a premium per gallon. Residential tanks follow the 80 percent rule, so a 500-gallon vessel tops out at about 400 gallons per fill, which at recent retail ranges yields $960–$1,100 for a planned top-off, with real-world invoices commonly quoted at $600–$1,600 depending on region and supplier policies, according to HomeAdvisor.

You might also like our articles about the cost of a Blue Rhino Propane Tank, Acetylene Tank Refill, or propane tank rectification.

Use this quick table as a compass before you call suppliers.

Small tank. Small bill.

Real-Life Cost Examples

Raleigh, North Carolina, backyard grill. A customer arrives at a refill station with a 20 lb cylinder. The attendant dispenses 4.5 gallons at $2.65 per gallon, prints a ticket for $11.93, and adds a $1 station fee. Total paid $12.93. If the same customer had used a kiosk exchange at $22.99 that day, the effective per-gallon price would have landed around $5.40 given a 15 lb fill weight, which is why frequent grillers often refill.

Great Falls, Montana, 500-gallon tank. A homeowner schedules a top-off at the first cold snap. The supplier charges $2.55 per gallon with a $45 delivery fee and fills 260 gallons to reach 80 percent. The invoice shows $663 for fuel plus fees, $708 all-in. The same order in late January might have hit a higher per-gallon rate due to seasonal demand, which is common in northern states, per the EIA regional series.

Mobile RV owner, Arizona. The driver refills two 30 lb cylinders at a farm supply store. Each tank takes about 7 gallons and the posted pump price is $2.49 per gallon. The clerk adds a $0.50 per-tank service fee, which brings each refill to roughly $18.93. The same trip with an exchange would have cost nearer $45–$50 for two swaps and delivered less propane per cylinder.

Worked example, 100-gallon tank. Assume 80 gallons delivered at $2.70 per gallon with a $15 HazMat charge and $10 fuel surcharge. Fuel $216 plus $25 in fees yields $241. Clear, predictable, and aligned with published averages in many regions, per the EIA.

Cost Breakdown

Base propane charge. Multiply gallons by the local retail price per gallon. National averages are public and updated weekly, which lets you sanity-check quotes and spot seasonal patterns that can raise winter bills in the Midwest and Northeast EIA weekly.

Refill labor or exchange fee. Stations often add a small flat fee per cylinder. Exchange programs price convenience into a single number that usually exceeds a per-gallon refill when normalized for actual propane received U-Haul.

Delivery and surcharges. Residential accounts may see delivery, HazMat, minimum usage, tank rental, or off-route fees. These vary widely by supplier, which is why quotes should list line items. Many underground tanks and first-time installs also bring site preparation charges that ripple into future refills if minimums are not met.

Taxes and environmental charges. State and local taxes apply in some jurisdictions. Ask whether regulatory tests, leak checks, or valve replacements are included during seasonal visits.

Accessories and safety add-ons. New cylinders, OPD valves, inline gauges, and hoses sit outside the fuel price. These are modest one-time items, yet they appear on many first-season bills. A 20 lb cylinder’s safe capacity target is 4.7 gallons, which is published by several tank makers and propane retailers, so use it as a quality check at refill time Ferrellgas.

Factors Influencing the Cost

Tank size and frequency. Larger vessels reduce trips and can unlock better per-gallon pricing with some suppliers, though underground tanks cost more to install and to service. Small portable cylinders are simple and fast to refill, which suits grills and patio heaters.

Regional rates. The EIA’s weekly residential series shows persistent differences across regions, with higher averages in the Northeast and Upper Midwest during heating season. Local competition matters too, since more suppliers often equals tighter spreads on quotes EIA.

Seasonal demand. Winter lifts consumption and can lift prices. Summer refills for households that heat with propane are a popular way to avoid peak rates. Market forecasts for 2025 anticipate steady demand from residential, commercial, and agricultural users, with prices tracking broader energy trends Foster Fuels.

Supplier and program. Exchange brands emphasize convenience and tank safety checks, while refill stations focus on price per gallon. Residential suppliers bundle delivery, tank monitoring, and maintenance. Policies around minimum usage and rental can shift the annual total even if per-gallon fuel is similar.

Regulation and supply chain. Safety rules govern cylinder valves and the 80 percent fill limit. Logistics, trucking, and wholesale supply affect local availability. A cold snap or pipeline constraint can tighten supply in specific markets for weeks, which shows up in quotes fast.

Alternative Products or Services

Exchange vs. refill. Exchange kiosks are convenient, especially after hours, and include tank inspections that many users value. For frequent users, refilling a 20 lb cylinder usually lowers the price per gallon because you pay for the actual fuel dispensed rather than a flat swap price U-Haul.

Natural gas and electric options. Converting a grill to natural gas or switching a space heater to electric rewrites the fuel bill and the hardware. Energy market outlooks suggest propane will remain competitive in many regions, but local utility rates and installation costs drive the decision for fixed appliances, as the EIA portal shows.

Bulk purchasing and co-ops. Some rural communities and HOAs coordinate seasonal deliveries. The pitch is volume and route density to reduce per-stop costs. Ask suppliers about price-cap or pre-buy programs ahead of winter if cash flow predictability is key.

Ways to Spend Less

Standardize your ask. When you call, request a quote that includes price per gallon, delivery fee, HazMat or safety charges, minimum-usage policies, and any rental or monitoring costs. Apples to apples unlocks better decisions.

Refill cylinders when possible. The math usually favors refills over exchanges when you grill often. Track your local per-gallon rate weekly and refill before weekends or holidays. For large tanks, schedule summer fills and ask about pre-buy or budget plans if you heat with propane. Installation choices matter too, since underground tanks cost more to install and maintain than above-ground tanks, often by 50–100 percent on comparable capacities Angi.

Negotiate politely. New residential customers sometimes receive introductory per-gallon rates or waived delivery fees. Loyalty programs and route-day scheduling can trim a few dollars per order. Small wins compound over a heating season. It adds up.

Expert Insights & Sources

• Use public price baselines. The EIA posts weekly residential propane averages by region so you can benchmark quotes against transparent data in the EIA weekly series.
• Mind cylinder capacity. A 20 lb tank’s practical fill target is 4.7 gallons, which helps you spot underfilled refills and compare refills to exchanges accurately Ferrellgas.
• Plan your season. Many suppliers publish forecasts and advice for winter pricing, which can guide off-peak top-ups and budget plans Foster Fuels.
• Ask about install ripple effects. Installation choices for residential tanks influence future fees and refill logistics, so scan cost guides before you pick a size or underground option HomeAdvisor.

Hidden costs to watch

Delivery and HazMat fees can tack on $5–$25 per order. Residential minimum-use or rental charges can add $50–$150 per year if your consumption drops. Cylinder swaps sometimes include “reconditioning” line items that are bundled into the flat price. Leak checks, regulator replacements, and first-fill inspections show up on early bills, and some suppliers charge for off-route dispatch. Ask for a written estimate. Then approve.

Answers to Common Questions

What is the cost to fill 20 lb propane tank today? Expect about $10–$15 at refill stations based on 4.0–4.7 gallons at recent averages, while exchanges typically cost $20–$25 and include less propane.

Why do suppliers fill residential tanks to only 80 percent?
Safety and expansion room. Propane expands with temperature, so tanks are filled to about 80 percent of water capacity to prevent pressure issues, which is standard practice per Angi.

Is it cheaper to exchange or refill?
Refill, most of the time. You usually pay a lower effective price per gallon and receive a full 20 lb equivalent when the cylinder is properly topped at a station.

How often do propane prices change?
Weekly movements are common in many markets. The EIA updates national and regional averages weekly, which you can use to plan fills and compare quotes.

Do underground tanks change my refill costs?
They can, mainly via higher install and maintenance costs and potential minimum-use policies. The per-gallon fuel price may be similar, but the annual total can be higher due to program terms, per HomeAdvisor.

Two quick coaching notes. Ask for line items. Time large fills to off-peak months. Then relax and grill.