Gasoline Gallon Equivalent (GGE) Calculator
This free gasoline gallon equivalent calculator converts kWh, diesel, propane, BTU, E85, hydrogen, CNG, and eleven other energy units into their GGE value the instant you type a number or change the dropdown above. There's no submit button and no file to upload — every conversion runs on published DOE and NIST fuel-energy figures, entirely on your device.
What Is a Gasoline Gallon Equivalent (GGE)?
A gasoline gallon equivalent is a standard unit that lets you compare fuels and energy sources that don't naturally share a unit — electricity in kilowatt-hours, natural gas in therms, diesel in gallons — by expressing each one as "how many gallons of gasoline hold the same energy." The baseline is 114,000 BTU, the energy content of one gallon of certification-grade gasoline as defined in NIST Handbook 44. Every other fuel's GGE factor is a ratio against that same 114,000 BTU figure, which is why diesel (more energy-dense than gasoline) converts to more than 1 GGE per gallon, and propane (less energy-dense) converts to less.
How to Convert Energy Sources to Gasoline Gallons Equivalent
Type an amount into the number field, then pick the unit you're converting from — kilowatt- hours, a gallon of diesel, biodiesel, propane, E85, ethanol, methanol, LNG, hydrogen (by kilogram or liquid gallon), natural gas by the hundred cubic feet, or raw BTU, therm, and MMBtu figures. The result updates immediately above the fields, rounded to three decimal places, and multiplying is the only operation involved: your amount times that unit's fixed GGE factor. A large industrial gas bill in MMBtu converts the same way — 1 MMBtu of natural gas equals roughly 8.77 gasoline gallons equivalent, using the same 114,000-BTU basis as every other unit here.
Common Fuel Conversions: kWh, Diesel, Propane, and More
The three most-searched conversions this tool handles:
- kWh to gallons of gas — 33.7 kWh = 1 GGE, the exact figure behind every EV's EPA fuel-economy sticker.
- Diesel gallon equivalent — 1 gallon of diesel = 1.14 GGE, since diesel carries more usable energy per gallon than gasoline.
- Propane to gasoline gallon equivalent — 1 gallon of propane (LPG) = 0.74 GGE, reflecting propane's lower energy density.
Every factor in the calculator comes from a published U.S. government source rather than an estimate: the Department of Energy's EPAct "Fuel Conversion Factors to Gasoline Gallon Equivalents" table for diesel, biodiesel, propane, E85, LNG, and hydrogen; the DOE Alternative Fuels Data Center for ethanol and methanol; and NIST Handbook 44 for the 114,000-BTU energy basis behind BTU, therm, and MMBtu.
Why GGE Matters for EVs and Alternative Fuel Vehicles
GGE is the common currency that lets a plug-in hybrid, a CNG fleet truck, and a diesel pickup all be compared on one scale — it's the same math behind an EV's MPGe rating, fleet fuel-cost comparisons across mixed vehicle types, and DOE Alternative Fuel Vehicle (AFV) compliance reporting. Whether you're sizing up a home EV-charging cost against a gas fill-up or comparing a fleet's propane and diesel spend side by side, converting everything to GGE first puts every fuel on equal footing.
Frequently Asked Questions
How many kWh equal a gallon of gas?
33.7 kWh of electricity equal one gasoline gallon equivalent (GGE) — the exact figure the EPA uses to label every EV's fuel-economy sticker. Enter any kWh amount into the calculator above with Kilowatt-hour selected and it converts instantly using that same 33.7 kWh/GGE figure.
What is a diesel gallon equivalent (DGE)?
A diesel gallon equivalent (DGE) measures diesel fuel by its energy content rather than volume. Because diesel packs more energy per gallon than gasoline, one gallon of diesel equals 1.14 gasoline gallons equivalent (GGE) — the U.S. Department of Energy's published EPAct conversion factor.
How many BTUs are in a gallon of gasoline?
One gasoline gallon equivalent is defined as 114,000 BTU, the NIST Handbook 44 energy basis built from certification-grade Indolene gasoline. Select BTU, British Thermal Unit, or Therm in the calculator to convert any raw energy figure straight into GGE using that same 114,000 BTU baseline.
What's the gasoline gallon equivalent for propane?
One gallon of propane (LPG) equals 0.74 gasoline gallons equivalent, per the DOE's EPAct conversion table — propane holds less energy per gallon than gasoline, so it takes more than a gallon of propane to match one GGE.
How does E85 compare to a gallon of gasoline?
One gallon of E85 (85% ethanol blend) equals 0.78 gasoline gallons equivalent — ethanol's lower energy density than gasoline means an E85 tank needs roughly 28% more volume to travel the same distance as straight gasoline, all else equal.
What is MPGe (miles per gallon equivalent) for EVs?
MPGe converts an electric vehicle's electricity use into the same miles-per-gallon language as a gas car, using the EPA's fixed 33.7 kWh = 1 GGE figure. This calculator applies that identical conversion, so a kWh amount you enter reflects the same energy basis EPA uses for window-sticker MPGe ratings.
How is CNG converted to gasoline gallon equivalent?
Compressed natural gas is typically metered in hundred-cubic-foot units (Ccf); one Ccf of natural gas equals 0.81 gasoline gallons equivalent per the DOE's EPAct table. Select Hundred Cubic Feet of Natural Gas in the calculator above to convert a Ccf reading directly to GGE.
