Select watts to Btu per hour or the reverse conversion. W, kW and MW are supported, along with International Table Btu/h, thousand Btu/h and million Btu/h (MMBtu/h). This converts power, not total heat energy.

Converts power to power. Btu/h is a rate; total heat in Btu also requires time. Uses International Table Btu.

Watts To Btu Formula

The following formula converts watts to International Table Btu per hour, a unit of power:

BtuIT / h ≈ Watts × 3.412141633128

Variables:

  • BtuIT/h is the equivalent thermal-power rate in International Table British thermal units per hour
  • Watts is the value in watts that needs to be converted

To convert watts to BtuIT/h, multiply by 3600/1055.05585262 (approximately 3.412141633128). Total energy in Btu also requires time: multiply a constant Btu/h rate by hours.

Watts to BTU/hr Conversion Table
Watts (W) BTU per hour (BTU/hr)
1034.121
2585.304
40136.486
60204.728
75255.911
100341.214
150511.821
200682.428
250853.035
3001023.642
4001364.857
5001706.071
7502559.106
10003412.142
12004094.570
15005118.212
20006824.283
25008530.354
300010236.425
500017060.708
Conversion factor: 1 W ≈ 3.412141633128 BtuIT/h; table values are rounded.

What Does “Watts to Btu” Mean?

A watt is a power rate of one joule per second. International Table Btu is an energy unit equal to 1055.05585262 joules, so BtuIT per hour is a power unit. One watt is approximately 3.412141633128 BtuIT/h. Total Btu energy requires an operating duration; this calculator converts only power rates. Other Btu conventions have different factors.

How to Calculate Watts To Btu?

The following steps outline the power conversion from watts to BtuIT/h.

  1. First, determine the power in watts (W).
  2. Next, use the conversion factor: 1 watt ≈ 3.412141633128 BtuIT/h.
  3. Multiply the power in watts by the conversion factor to get the equivalent power in BTU/hr.
  4. Finally, report the equivalent power in BtuIT/h.
  5. After inserting the power in watts and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Power in watts (W) = 500