Room Size Radiator BTU Calculator

Radiator Heating Load Formula:

\[ Q = A \times \text{BTU/ft}^2 \]

Heating Load (BTU/h):

Definition: This calculator estimates the heating load in BTUs required for a room based on its size and heat loss characteristics.

Purpose: It helps homeowners and HVAC professionals determine the appropriate radiator size for effective room heating.

The calculator uses the formula:

\[ Q = A \times \text{BTU/ft}^2 \]

Where:

Explanation: The room area is multiplied by the heat loss factor to determine the total heating requirement.

Details: Proper BTU estimation ensures comfortable room temperatures, energy efficiency, and prevents radiator undersizing or oversizing.

Tips: Enter the room area in square feet and BTU per square foot (default 10 BTU/h·ft² for moderate climates). All values must be > 0.

Q1: What's a typical BTU/ft² value?
A: For moderate climates, 10 BTU/ft² is common. Use 12-15 for colder climates or poorly insulated rooms.

Q2: How do I measure room area?
A: Multiply room length by width. For irregular rooms, divide into rectangles and sum their areas.

Q3: When would I need a higher BTU/ft² value?
A: For rooms with high ceilings, poor insulation, many windows, or in very cold climates.

Q4: Does this account for room height?
A: The basic calculation doesn't. For rooms over 8ft tall, multiply result by (height/8).

Q5: How many radiators do I need?
A: Divide total BTU by your radiator's output (check manufacturer specs) to determine quantity.