Heat Density Converter

ConversionEdited by Hemant Kumar and Anjita Rai, founders · How we checkUpdated Free · No sign-up

Quick answer: Choose a starting unit and a target unit, then enter a value. Common conversions: 1 J/m³ = 0.001 kJ/m³; 1 J/m³ = 0.000001 MJ/m³; 1 J/m³ = 0.00002683919 Btu/ft³. This converter covers 7 heat density units.

Use the Heat Density Converter

Heat Density formula and what each symbol means

target = value × (factor of starting unit ÷ factor of target unit), where each factor is the unit value in J/m³.

Symbols used in the formula
SymbolMeaning
valueThe number you want to convert
factorThe unit’s size expressed in the base unit (J/m³)

Heat Density examples

J/m³ to kJ/m³

10 J/m³ = 0.01 kJ/m³.

J/m³ to MJ/m³

10 J/m³ = 0.00001 MJ/m³.

J/m³ to Btu/ft³

10 J/m³ = 0.0002683919 Btu/ft³.

How to calculate Heat Density step by step

  1. Choose the starting unit and the target unit.
  2. Enter your value.
  3. Read the converted value, plus the conversion factor in both directions.

Popular heat density conversions

How to read your Heat Density result

Heat density here means energy per unit volume, such as the energy content of a fuel or stored heat. The SI unit is joule per cubic metre. One Btu per cubic foot is about 37,259 J/m³, so natural-gas heating values quoted in Btu/ft³ convert to roughly 37 MJ/m³ per 1,000 Btu/ft³.

UNITSYMBOLEQUALSVALUE OF 1 J/M³
Joule per cubic meterJ/m³1 J/m³ = 1 J/m³1 J/m³
Kilojoule per cubic meterkJ/m³1 kJ/m³ = 1,000 J/m³0.001 kJ/m³
Megajoule per cubic meterMJ/m³1 MJ/m³ = 1,000,000 J/m³0.000001 MJ/m³
Joule per literJ/L1 J/L = 1,000 J/m³0.001 J/L
Kilowatt hour per cubic meterkWh/m³1 kWh/m³ = 3,600,000 J/m³2.777778×10⁻⁷ kWh/m³
Kilocalorie per cubic meterkcal/m³1 kcal/m³ = 4,184 J/m³0.0002390057 kcal/m³
Btu per cubic footBtu/ft³1 Btu/ft³ = 37,258.946 J/m³0.00002683919 Btu/ft³

Common mistakes when calculating Heat Density

  • Mixing energy per volume (J/m³) with energy per mass (J/kg).
  • Forgetting that 1 MJ/m³ is 1,000 kJ/m³.
  • Using a gross heating value where a net value is needed.

Heat Density FAQ

How many J/m³ is 1 Btu/ft³?

About 37,258.9 J/m³.

How many kJ/m³ is 1 MJ/m³?

1 MJ/m³ is 1,000 kJ/m³.

Is heat density the same as energy density?

In this converter, yes: both mean energy per unit volume.

What is the base unit for heat density?

This converter uses joule per cubic meter (J/m³) as the common base unit: every value is first converted to it and then to the target unit.

How do I convert between two heat density units?

Choose the starting and target units, enter the value and read the result. By hand: convert to the base unit with the table, then divide by the target unit factor.

How many kilojoules per cubic meter are in 1 joule per cubic meter?

1 J/m³ = 0.001 kJ/m³.

How many megajoules per cubic meter are in 1 joule per cubic meter?

1 J/m³ = 0.000001 MJ/m³.

How many btu per cubic foot are in 1 joule per cubic meter?

1 J/m³ = 0.00002683919 Btu/ft³.

Which heat density units does this converter support?

It covers 7 units: joule per cubic meter (J/m³), kilojoule per cubic meter (kJ/m³), megajoule per cubic meter (MJ/m³), joule per liter (J/L), kilowatt hour per cubic meter (kWh/m³), kilocalorie per cubic meter (kcal/m³), btu per cubic foot (Btu/ft³).

How accurate is the heat density converter?

Results are calculated at full double precision and shown to about 8 significant figures. Round the answer to the precision of your original measurement; a result cannot be more accurate than the number you started with.

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Method, review and disclaimer

Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the International System of Units (SI)