Convert Liters per Joule to Gallons (US) per Horsepower-hour
Liter per Joule (L/J) to Gallon (US) per Horsepower-hour (gal/(hp·h)) volume-basis fuel efficiency conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 L/J = 709175.04 gal/(hp·h)
1 Liter per Joule = 709175.04 Gallons (US) per Horsepower-hour
1 Gallon (US) per Horsepower-hour = 1.41009E-06 Liters per Joule
1 L/J in every supported unit
Conversion chart: Liter per Joule to Gallons (US) per Horsepower-hour
Conversion table
| Liter per Joule (L/J) | Gallon (US) per Horsepower-hour (gal/(hp·h)) |
|---|---|
| 0.01 L/J | 7091.7504 gal/(hp·h) |
| 0.1 L/J | 70917.504 gal/(hp·h) |
| 1 L/J | 709175.04 gal/(hp·h) |
| 2 L/J | 1418350.1 gal/(hp·h) |
| 3 L/J | 2127525.1 gal/(hp·h) |
| 5 L/J | 3545875.2 gal/(hp·h) |
| 10 L/J | 7091750.4 gal/(hp·h) |
| 20 L/J | 14183501 gal/(hp·h) |
| 50 L/J | 35458752 gal/(hp·h) |
| 100 L/J | 70917504 gal/(hp·h) |
| 1000 L/J | 7.0917504E+08 gal/(hp·h) |
Liter per Joule (L/J)
Definition: A specific fuel consumption unit expressing how many liters of fuel volume are needed to deliver one joule of energy — the reciprocal of joules per liter.
History: A natural inversion of the joule-per-liter energy-density unit, used wherever a volume-budgeting rather than energy-content framing is more convenient.
Current use: Occasionally used in laboratory and small-scale process calculations that need fuel volume expressed directly per unit of heat delivered.
Gallon (US) per Horsepower-hour (gal/(hp·h))
Definition: A volume-basis specific fuel consumption rating — US gallons of fuel burned per horsepower of engine output sustained for one hour, the volume equivalent of pounds per horsepower-hour.
History: Standardized alongside the mass-basis lb/(hp·h) rating in the early-to-mid 20th century engine industry, for contexts where fuel is metered by volume (gallons at the pump) rather than weighed.
Current use: Used in marine and industrial engine specifications and fuel-planning worksheets where tank capacity and refueling are naturally tracked in gallons rather than pounds.
Supported Units
| Unit | Symbol | Category |
|---|---|---|
| Joule per Cubic Meter | J/m³ | Energy density (energy/volume) |
| Kilojoule per Cubic Meter | kJ/m³ | Energy density (energy/volume) |
| Megajoule per Cubic Meter | MJ/m³ | Energy density (energy/volume) |
| Joule per Liter | J/L | Energy density (energy/volume) |
| Btu (IT) per Cubic Foot | Btu/ft³ | Energy density (energy/volume) |
| Kilocalorie (IT) per Cubic Meter | kcal/m³ | Energy density (energy/volume) |
| Cubic Meter per Joule | m³/J | Specific fuel consumption (volume/energy) |
| Liter per Joule | L/J | Specific fuel consumption (volume/energy) |
| Gallon (US) per Horsepower-hour | gal/(hp·h) | Specific fuel consumption (volume/energy) |
About These Parameters
- Value
- The fuel-efficiency figure you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in — an energy-density unit like Btu/ft³ (natural gas heating value) or a volume-basis SFC unit like gal/(hp·h).
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Fuel Efficiency - Volume Conversion Works
The Formula
Within the same group (both energy density, or both volume-basis SFC), conversion is a simple multiplication:
result = value × (factor of "From" unit ÷ factor of "To" unit)
Crossing between the two groups instead inverts through the base unit:
SFC unit = (factor of SFC unit) ÷ (value × factor of energy-density unit)
For Liter per Joule → Gallon (US) per Horsepower-hour: 1 L/J = 709175.04 gal/(hp·h).
Natural Gas Heating Value
Btu per cubic foot is the figure US natural gas utilities print on customer bills and pipeline specifications — "pipeline-quality" gas is typically standardized around 1,000-1,050 Btu/ft³. A higher figure means more energy is delivered for the same metered volume of gas, which is why utilities monitor and adjust the heating value of blended gas supplies to stay within a contracted range.
Mass Basis vs. Volume Basis
This converter's companion, the Fuel Efficiency - Mass Converter, measures the same underlying idea (energy content and fuel consumption) but per unit of fuel mass instead of volume. The two only agree once you know the fuel's density — a liter of gasoline and a liter of diesel contain different masses, and therefore convert differently between the mass and volume versions of these units.
Example
Pipeline-quality natural gas rated at 1,000 Btu/ft³ converts to about 37.258946 MJ/m³ — the figure a European gas specification would use for the same fuel quality.
Frequently Asked Questions
How many Gallons (US) per Horsepower-hour are in 1 Liter per Joule?
1 Liter per Joule (L/J) equals exactly 709175.04 Gallons (US) per Horsepower-hour (gal/(hp·h)).
What does "1,000 Btu" natural gas mean on my utility bill?
Utilities often bill natural gas by volume (hundred cubic feet, or "CCF"), then apply a heating-value factor close to 1,000-1,050 Btu per cubic foot to convert that volume into billed energy (therms). The exact figure varies slightly by gas source and blend, which is why bills sometimes show a "Btu factor" alongside the metered volume.
Why is there a separate Mass and Volume fuel efficiency converter?
Mass and volume only convert into each other through a fuel's density, which this page doesn't assume. Use the Mass converter for calorific value and SFC figures reported per kilogram or pound; use this Volume converter for figures reported per liter, cubic meter, or gallon.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally recognized relationship between the underlying energy and volume units (e.g. 1 Btu = exactly 1,055.05585262 joules) — results are limited only by floating-point display precision, not by rounded conversion constants.