Convert BTU per Hour to Watts

About converting BTU per Hour to Watts

BTU per Hour (BTU/h) and Watts (W) are both units of power, so converting between them is a single multiplication: multiply your BTU per Hour figure by 0.2931. Ten BTU per Hour comes to 2.9307 Watts, and a hundred works out at 29.3071 Watts.

Rule of thumb: going from BTU per Hour to Watts divides, so the figure always shrinks — it takes about 3.4121 BTU per Hour to make a single Watt. If your answer came out bigger, you have the conversion the wrong way round.

What is a BTU per Hour?

BTU per hour is the unit American heating and cooling equipment is sized in: furnaces, boilers, air conditioners and heat pumps all carry a BTU/h rating. It is a rate of heat flow — genuinely a power, in the same family as the watt — but the "per hour" is dropped so routinely in advertising that a "12,000 BTU air conditioner" reads as normal, which quietly confuses a quantity of energy with a rate of delivering it. It also inherits the BTU’s vagueness: several BTU definitions exist and differ by a fraction of a percent, so any conversion here rests on one chosen convention.

What is a Watt?

The watt is the SI unit of power — one joule per second — named after James Watt, whose steam-engine improvements did as much as anything to make the idea of power commercially interesting. It measures a rate, not an amount: a watt tells you how fast energy is being moved or converted and says nothing on its own about how much has been used. That is the entire difference between the watts printed on a light bulb and the kilowatt-hours printed on the bill. It is also deliberately universal — the same unit rates a bulb, a loudspeaker, an engine, a laser and a cyclist on a hill.

To put both in perspective: a window air conditioner is usually 5,000 to 12,000 BTU per hour, while an LED bulb bright enough for a room draws about 10 watts.

The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Watts to BTU per Hour converter, or browse all Power converters.