Propane Fill Cost Calculator
What will today's propane fill cost? Pick a region, tank size, and fill percentage. The calculator multiplies your gallons by the current EIA residential propane price for the week ending 30 March 2026, and compares the same fill against the EIA national price for the same week of 2025.
How this is calculated
The math is direct. Gallons in this fill equals tank size multiplied by fill percentage. Fill cost equals gallons multiplied by the current EIA residential propane price per gallon for the selected region. The same-fill-last-year reference uses the EIA US national residential propane price for the same week of 2025 ( $2.674 this year vs $2.621 last year, a +2.0% year-on-year move at the national level).
The 80% default fill cap reflects NFPA 58 Liquefied Petroleum Gas Code expansion allowance: residential propane tanks are filled to roughly 80 percent of water capacity to leave room for liquid expansion as temperature rises. Suppliers will not knowingly fill past that line.
Where the price figures come from
Region prices are pulled directly from the EIA Weekly Heating Oil and Propane Survey. The US national row uses series W_EPLLPA_PRS_NUS_DPG; per-state rows use the corresponding W_EPLLPA_PRS_S**_DPG series, e.g. W_EPLLPA_PRS_STX_DPG for Texas. The data file is refreshed every Wednesday afternoon during the heating season (October through March) and on the second Monday of each off-season month. See methodology for the full refresh schedule and source list.
The EIA Weekly Survey publishes per-state weekly observations for eight high-volume residential propane states (Texas, Ohio, Michigan, North Carolina, Iowa, Pennsylvania, Kentucky, Wisconsin). Households in other states should use the US national average row as the closest published reference.
What this calculator does not estimate
This is a fill-cost calculator, not an annual-budget calculator. It answers "what will today's top-up cost?". It does not model annual gallons consumed, climate-zone heat-load, or fills-per-season. For annual household budget planning, including tank-size sizing, climate-zone gallons, and fills needed across the heating season, use the sister site propanecostpergallon.com. The two sites split the propane decision: this one answers "is today a good day to buy?", the sister answers "what will I pay for the year?".