BTU to kJ
One BTU is the heat needed to raise a pound of water by 1 °F, about 1.055 kJ. Air conditioners and boilers are rated in BTU per hour, and 12,000 BTU/h is one ton of refrigeration.
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Common values
Formula
kJ = BTU × 1.055056
An air conditioner’s “12,000 BTU” is a per-hour figure. As a rule of thumb, twenty square metres needs about 5,000 BTU/h.
Frequently asked questions
Q. How many kJ is 1 BTU?
1 BTU is 1.0551 kJ, and 10 BTU is 10.5506 kJ. Type any value in the box above to convert instantly.
Q. And how many BTU is 1 kJ?
1 kJ is 0.9478 BTU. This converter works both ways, so typing in the right box updates the left one.
Q. Where is this unit used?
An air conditioner’s “12,000 BTU” is a per-hour figure. As a rule of thumb, twenty square metres needs about 5,000 BTU/h.
Other converters
Traditional units (geun, doe, majigi and so on) vary by region and product.