How Do You Size a Radiator for a Room

Measure the length, width and height of the room in feet. Multiply all three values to determine the cubic footage of the space. For example, if you have a room that measures 12 feet long by 10 feet wide by 7 feet high, multiplying 12 by 10 by 7 produces 840 cubic feet.

How do you calculate radiator size for a room?

Measure the length, width and height of the room in feet. Multiply all three values to determine the cubic footage of the space. For example, if you have a room that measures 12 feet long by 10 feet wide by 7 feet high, multiplying 12 by 10 by 7 produces 840 cubic feet.

How do you calculate BTU for a room?

For example, a 300 square foot room typically requires 7,000 BTUs to maintain a comfortable temperature, while a 1,000 square foot room requires 18,000 BTUs. A simple formula to determine your heating needs is: (desired temperature change) x (cubic feet of space) x . 133 = BTUs needed per hour.