138 Btu to Joules

138 Btu ≈ 1.456e+5 J

Calculation: J = 138 Btu × 1055.06 ≈ 1.456e+5 J

Btu to Joule Converter

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How to Convert Btu to Joule

1 Btu = 1055.06 Joules

Joule = Btu × 1055.06

Example: 138 Btu × 1055.06 = 145600 J

Reverse Conversion

To convert Joules back to Btu:

  • Remember, 1 joule equals 0.000947817 Btu.
  • To convert 145600 J to Btu, multiply 145600 x 0.000947817, resulting in 138 Btu.

138 Btu is also equal to:

  • 145.6 kilojoule
  • 0.040444 kilowatt hour
  • 34.799 calorie (nutritional)
  • 40.444 watt hour
About these units

Btu: British thermal unit (IT) — legacy heat unit based on heating water.

Joule: SI unit of energy: 1 J = 1 N·m = 1 kg·m²·s⁻².

Frequently Asked Questions

How much is 138 Btu in Joules?

138 Btu equals 145600 Joules. This is calculated by multiplying 138 by the conversion factor 1055.06.

What does 138 Btu look like in Joules?

138 Btu (145600 Joules) is heating a cup of water — a kettle uses about 300 Btu.

How do you calculate 138 Btu to Joules?

Multiply 138 by the conversion factor 1055.06. The calculation is 138 × 1055.06 = 145600 Joules. This factor is defined by international measurement standards.

Share This Calculation

138 Btu = 145598 Joules
138 Btu = 145598 Joules — conversion chart

Nearby Conversions

128 Btu135000 Joules 129 Btu136100 Joules 130 Btu137200 Joules 131 Btu138200 Joules 132 Btu139300 Joules 133 Btu140300 Joules 134 Btu141400 Joules 135 Btu142400 Joules 136 Btu143500 Joules 137 Btu144500 Joules 139 Btu146700 Joules 140 Btu147700 Joules 141 Btu148800 Joules 142 Btu149800 Joules 143 Btu150900 Joules 144 Btu151900 Joules 145 Btu153000 Joules 146 Btu154000 Joules 147 Btu155100 Joules 148 Btu156100 Joules

For general conversions between Btu and Joules, see the Btu to Joules converter.

Also convert Btu to:

Conversion factors verified against NIST, BIPM, ISO 80000-4 1 cal_IT = 4.1868 J by definition (BIPM/ITS-90). Last reviewed: April 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.