Conversion method
Volumetric fuel energy, not distance per gallon. Volume depends on reference temperature and pressure. No density or heating-value assumptions are introduced.
MJ/m³ = x × 0.000001
10 J/m³ = 0.00001 MJ/m³.
| J/m³ | MJ/m³ |
|---|---|
| 1 | 0.000001 |
| 5 | 0.000005 |
| 10 | 0.00001 |
| 25 | 0.000025 |
| 50 | 0.00005 |
| 100 | 0.0001 |
Unit definitions and sources
Volumetric fuel energy, not distance per gallon. Volume depends on reference temperature and pressure. No density or heating-value assumptions are introduced.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Joule per cubic meter (J/m³); si | Common units | Base J/m³ = value in J/m³ × 1. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Megajoule per cubic meter (MJ/m³); si | Common units | Base J/m³ = value in MJ/m³ × 1000000.0. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Joule per liter (J/L); si | Specialist units | Base J/m³ = value in J/L × 1000. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Megajoule per liter (MJ/L); si | Specialist units | Base J/m³ = value in MJ/L × 1000000000.0. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| BTU (IT) per cubic foot (BTU IT/ft³); si | Specialist units | Base J/m³ = value in BTU IT/ft³ × 37258.94580783128. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Liter per joule (L/J); si | Specialist units | Base J/m³ = 1000 / value in L/J. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilojoule/cubic meter (kJ/(m³)); other | Specialist units | kilojoule/cubic meter = 1000.0 j-m3, derived from the component SI/customary definitions. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilocalorie (IT)/cubic meter (kcal IT/(m³)); other | Specialist units | kilocalorie (IT)/cubic meter = 4186.8 j-m3, derived from the component SI/customary definitions. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Calorie (IT)/cubic centimeter (cal IT/(cm³)); other | Specialist units | calorie (IT)/cubic centimeter = 4186799.999999999 j-m3, derived from the component SI/customary definitions. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Btu (th)/cubic foot (BTU th/(ft³)); other | Specialist units | Btu (th)/cubic foot = 37234.02819813845 j-m3, derived from the component SI/customary definitions. Common use: Fuel Energy per Volume. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
Sources: NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of fuel energy per volume conversions
All 10 fuel energy per volume units convert through Joule per cubic meter (J/m³). 10 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.