100-Gallon Propane Tank Refill Cost: $214 in 2026
A 100-gallon home propane tank holds 80 usable gallons after the 80% safety fill. At the latest EIA national residential average ($2.67/gal), a full refill from near-empty costs about $214 at retail. 100-gallon tanks are typical for cabins and small cottages, or as a supplementary tank for homes that use propane only for fireplace and cooking. Most homeowners with whole-home propane heat have a 250+ gallon tank instead.
100-Gallon Tank Specs
| Nominal capacity | 100 gallons |
| Usable capacity (80% safety fill) | 80 gallons |
| Refill cost at national average | $214 ($2.67/gal) |
| Cheapest state refill | Nebraska: $131 ($1.64/gal) |
| Most expensive state refill | Florida: $376 ($4.71/gal) |
| BTU per full refill | 7.3 million BTU |
| Typical use case | Cabin, small cottage, supplementary residential heat, propane fireplace + range |
| Delivery method | Bobtail truck (no self-service) |
| Typical delivery fee | $0-$50 |
| Partial-fill surcharge (below 200 gal) | $25-$75 |
| Volume discount tier | 0-5% |
100-Gallon Refill: How the Cost Breaks Down
- Start with the EIA per-gallon average. The current US residential propane price is $2.67/gal (week ending 30 March 2026). State-by-state, the spread is $1.64 (cheapest, Nebraska) to $4.71 (most expensive, Florida). Your local supplier sets a retail rate near your state's EIA average.
- Multiply by usable gallons. 100 nominal × 0.80 safety fill = 80 usable gallons. 80 × $2.67 = $214 at the national-average retail rate.
- Subtract the volume discount. At a 100-gallon delivery size, most suppliers take 0-5% off the per-gallon rate. At 100 gallons you're near the volume-discount floor: most suppliers won't discount below 200 gallons, but a few add a small (5%) discount to retain residential customers.
- Add delivery fee (if any). Many suppliers include delivery free at this order size. Some charge a flat $0-$50 per stop, or waive it on auto-delivery accounts.
- Skip the partial-fill surcharge. Most suppliers add $25-$75 on deliveries below 200 gallons. At 100 gallons you're well above the threshold, so this surcharge does not apply.
Auto-Delivery vs Will-Call for 100-Gallon Tanks
Supplier monitors degree-days (or a smart tank gauge) and schedules fills automatically. Typically 5-10% cheaper per gallon because the supplier optimises route density. Default for 100-gallon residential customers.
You call when the gauge reads 20-30%. Useful if you have your own tank gauge alert OR you want price flexibility (calling at a forecast low). Pays the higher spot rate; only worth it if you watch pricing actively.
Lock a per-gallon rate in summer (typically May-Aug) for the next winter's deliveries. Usually 5-10% under spot, with a cap-price option that lets you keep the savings if the market falls. Strongly worth it in EIA-forecast spike years.