300 Btu to Joules

300 Btu ≈ 3.1652e+5 J

Calculation: J = 300 Btu × 1055.06 ≈ 3.1652e+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: 300 Btu × 1055.06 = 316520 J

Reverse Conversion

To convert Joules back to Btu:

  • Remember, 1 joule equals 0.000947817 Btu.
  • To convert 316520 J to Btu, multiply 316520 x 0.000947817, resulting in 300 Btu.

300 Btu is also equal to:

  • 316.52 kilojoule
  • 0.087921 kilowatt hour
  • 75.649 calorie (nutritional)
  • 87.921 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 300 Btu in Joules?

300 Btu equals 316520 Joules. This is calculated by multiplying 300 by the conversion factor 1055.06.

What does 300 Btu look like in Joules?

300 Btu (316520 Joules) is heating a cup of water — a kettle uses about 300 Btu.

How do you calculate 300 Btu to Joules?

Multiply 300 by the conversion factor 1055.06. The calculation is 300 × 1055.06 = 316520 Joules. This factor is defined by international measurement standards.

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300 Btu = 316517 Joules
300 Btu = 316517 Joules — conversion chart

Nearby Conversions

250 Btu263800 Joules 255 Btu269000 Joules 260 Btu274300 Joules 265 Btu279600 Joules 270 Btu284900 Joules 275 Btu290100 Joules 280 Btu295400 Joules 285 Btu300700 Joules 290 Btu306000 Joules 295 Btu311200 Joules 305 Btu321800 Joules 310 Btu327100 Joules 315 Btu332300 Joules 320 Btu337600 Joules 325 Btu342900 Joules 330 Btu348200 Joules 335 Btu353400 Joules 340 Btu358700 Joules 345 Btu364000 Joules 350 Btu369300 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.