BTU Calculator

Width (f):

Length (f):

Height (f):

Window Area (ft²):

Type of Room:

What is below the room?:

What is above the room?:

Type of Outside Wall:

Number of Outside Walls:

BTU Calculator Guide

Use this BTU Calculator to estimate the ideal heating or cooling capacity for your room, ensuring comfort and energy efficiency.

Room Dimensions: Enter the room's width, height, and length in meters to determine its volume, a key factor in BTU calculation.
Window Area & Type: Input the window area (m²) and select the window type (single, double, or triple-pane) for accurate adjustment based on heat loss or gain through windows.
Room Type: Select the room type (living room, bedroom, kitchen, or bathroom) to factor in unique heating or cooling needs.
Room Placement: Choose what’s below and above the room (heated space, unheated space, or roof). Rooms over unheated spaces or beneath uninsulated roofs may require additional BTUs.
Wall Type & Number: Specify if outside walls are insulated and the number of outside walls. More walls or non-insulated walls increase BTU needs.

After entering all details, click Calculate BTU for a tailored recommendation on the required BTUs to efficiently heat or cool your room.

The size of the radiator depends on your room’s BTU requirement, which factors in the room’s size, insulation, windows, and type of room. Use a radiator BTU calculator to determine the correct BTU output needed and select a radiator that matches or slightly exceeds this requirement.

To calculate your radiator’s BTU requirement, measure your room dimensions (length, width, and height), and account for insulation, number of windows, and room type. Enter these details into a BTU calculator for an accurate output recommendation.

Yes, in larger spaces, you can use multiple radiators. Sum the BTUs of each radiator to ensure they collectively meet or exceed the room’s total BTU requirement for effective heating.

Look for a radiator with a BTU output that matches the BTU needs of your room, which you can calculate using a BTU room calculator. For rooms with poor insulation or large windows, consider adding 10-15% to the estimated BTU to ensure adequate warmth.

To convert BTU to kilowatts (kW), divide the BTU number by 3,412. For example, a radiator with 5,000 BTU output is approximately 1.47 kW. This conversion can help you compare radiator options that list power in different units.

Yes, kitchens, bathrooms, and living rooms have varying heating needs. Kitchens may require less heat, while bathrooms often need higher BTU to stay warm and reduce humidity. Use a BTU calculator for room-specific estimates.

Poorly insulated rooms require more BTUs to maintain a comfortable temperature, so choose a radiator with a higher output if your walls or windows are not well-insulated.

Larger windows increase heat loss, meaning a higher BTU radiator may be necessary. Double- or triple-pane windows reduce this impact but still require accounting for in the BTU calculation.

Yes, but ensure the new radiator’s BTU output meets the room’s heating requirement. Replacing a radiator with one of lower output may result in insufficient heating.

As a rough guide, multiply the room’s area (in square meters) by 100-150 BTUs, adjusting for insulation and windows. However, for an exact figure, use a BTU calculator tailored to radiator requirements.

- Yes, high ceilings increase the volume of air, requiring more BTUs to heat. Enter ceiling height in your BTU calculator to ensure you choose a radiator capable of heating the entire space effectively.