BTU per Pound to Megajoules per Kilogram (BTU/lb to MJ/kg)

Formula

MJ/kg = BTU/lb × 0.002326

or MJ/kg = BTU/lb ÷ 429.9226139295

Derivation from SI units:

• 1 BTU_IT/lb = 1055.05585262 J ÷ 0.45359237 kg = 2326 J/kg exactly.
• 1 MJ/kg = 10⁶ J/kg.
• 1 BTU/lb = 2326 J/kg ÷ 1000000 J/kg per MJ/kg = 0.002326 MJ/kg

Both units are defined exactly, so the factor is exact. BTU per Pound definition: BTU per pound; Megajoule per Kilogram definition: megajoule per kilogram.

Worked examples

1. A reading of 144 BTU/lb converts to 0.334944 MJ/kg.
   144 BTU/lb × 0.002326 = 0.334944 MJ/kg
2. A value of 1000 BTU/lb is 2.326 MJ/kg.
   1000 BTU/lb × 0.002326 = 2.326 MJ/kg

Where it's used

BTU per Pound are used for US steam tables, while megajoules per kilogram appear in fuel calorific values (GCV, NCV). Both measure specific energy: enthalpy, latent heat and heating value per mass, so the conversion is a fixed factor.

BTU per Pound to other specific energy units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "British thermal unit_IT per pound".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units with special names).

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.