1200 Btu to Joules

1200 Btu ≈ 1.2661e+6 J

Calculation: J = 1200 Btu × 1055.06 ≈ 1.2661e+6 J

Btu to Joule Converter

Choose the type of measurement to convert
Select the source unit to convert from
Select the target unit to convert to
Enter a numeric value or fraction to convert
Sig. Figures:

How to Convert Btu to Joule

1 Btu = 1055.06 Joules

Joule = Btu × 1055.06

Example: 1200 Btu × 1055.06 = 1266100 J

Reverse Conversion

To convert Joules back to Btu:

  • Remember, 1 joule equals 0.000947817 Btu.
  • To convert 1266100 J to Btu, multiply 1266100 x 0.000947817, resulting in 1200 Btu.

1200 Btu is also equal to:

  • 1266.1 kilojoule
  • 0.35169 kilowatt hour
  • 302.6 calorie (nutritional)
  • 351.69 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 1200 Btu in Joules?

1200 Btu equals 1266100 Joules. This is calculated by multiplying 1200 by the conversion factor 1055.06.

What does 1200 Btu look like in Joules?

1200 Btu (1266100 Joules) is a small space heater output per hour.

How do you calculate 1200 Btu to Joules?

Multiply 1200 by the conversion factor 1055.06. The calculation is 1200 × 1055.06 = 1266100 Joules. This factor is defined by international measurement standards.

Share This Calculation

1200 Btu = 1266070 Joules
1200 Btu = 1266070 Joules — conversion chart

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.