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Heat Density Converter

Convert heat density (energy per unit volume) between J/m3, kJ/m3, MJ/m3, Wh/m3, kWh/m3, kcal/m3, cal/cm3 and BTU/ft3.

What this tool does

Convert heat density (energy per unit volume) between J/m3, kJ/m3, MJ/m3, Wh/m3, kWh/m3, kcal/m3, cal/cm3 and BTU/ft3. Type an amount in megajoules per cubic meter, choose the units, and the tool converts it to BTU (International Table) per cubic foot. It offers 8 energy density (energy per volume) units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Joule per cubic meter, Kilojoule per cubic meter, Megajoule per cubic meter, Watt-hour per cubic meter, Kilowatt-hour per cubic meter, Kilocalorie (thermochemical) per cubic meter, Calorie (thermochemical) per cubic centimeter, BTU (International Table) per cubic foot. Starts as Megajoule per cubic meter.
  • To: Choose one of the same 8 units as "From". Starts as BTU (International Table) per cubic foot.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from megajoules per cubic meter to BTU (International Table) per cubic foot:

  • 1 MJ/m³ ≈ 26.839192 BTU (IT)/ft³
  • 5 MJ/m³ ≈ 134.19596 BTU (IT)/ft³
  • 10 MJ/m³ ≈ 268.39192 BTU (IT)/ft³
  • 50 MJ/m³ ≈ 1,341.9596 BTU (IT)/ft³
  • 100 MJ/m³ ≈ 2,683.919199 BTU (IT)/ft³

Multiply the number of megajoules per cubic meter by about 26.839192 to get BTU (International Table) per cubic foot. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Megajoule per cubic meter: exact by definition. BTU (International Table) per cubic foot: NIST SP 811 (2008), Appendix B.9.

Limitations

  • Converts energy per unit volume only. It does not work out heating needs or fuel cost.
  • BTU is the International Table BTU and calorie is the thermochemical calorie.

FAQs

Q: How many BTU per cubic foot is one MJ/m3?
A: About 26.84 BTU per cubic foot, using the International Table BTU.
Q: Which BTU and calorie are used?
A: BTU means the International Table BTU (1055.05585262 J) and calorie means the thermochemical calorie (4.184 J). The thermochemical BTU and the International Table calorie are slightly different and are not offered here.

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