BTU Calculator

To calculate the BTUs needed to heat your room you will require the following measurements: Room Width, Room length and Room Height.

BTUs are calculated using the following formula: Room width x Room length x Room height x 4 = BTUs Required.

Example: 14ft x 12ft x 11ft x 4 = 7392 BTUs Required.

If the radiator you have selected is a four column model, 36" high. Each section produces 499 BTUs, so a 15 section radiator is needed.

To calculate the BTU/hour required for your room, just complete the following form:    

 1. Enter your Room Dimensions (in feet)
Width (feet): Length (feet): Height (feet):
 2. Select your Room Type
Lounge / Dining Room / Bathroom
Kitchen / Common Area
 3. Extra Features
Is your room North facing? Yes  
Does your room have a Patio Door? Yes  
Does your room have Double Glazing? Yes  
 4. Calculate BTU Rate
Clear Calculator  
 5. Result