Skip to main content
BTU to Tons

Watts to BTU per Second Calculator

Divide watts by about 1,055.06 to get BTU per second (BTU/s).

Cooling (thermal) watts, not an AC's electrical input.

cooling W
Cooling capacity

Enter a value in cooling W to see it in BTU/s.

Watts to BTU/s formula

One International Table BTU is 1,055.05585262 joules, and 1 watt is 1 joule per second. So BTU/s = W ÷ 1,055.05585262.

1,000 cooling W equals 0.9478 BTU/s.

1,000 ÷ 0.2930710702 = 3,412.1416 BTU/hr; 3,412.1416 ÷ 3,600 = 0.9478 BTU/s

Check your time unit

1 BTU/s = 60 BTU/min = 3,600 BTU/hr. AC ratings use BTU/hr, so for an AC you usually want watts to BTU/hr instead.