1. What is BTU per sq ft?

Definition: This calculator determines the heating capacity per square foot by dividing the total BTU output by the area to be heated.

Purpose: It helps HVAC professionals and homeowners assess heating system efficiency and distribution across a space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• BTU/sq ft — Heating capacity per square foot (BTU/h sq ft)
• Total BTU — Total heating output of the system (BTU/h)
• Area — Space area in square feet (sq ft)

Explanation: The total heating capacity is divided by the area to determine how much heating power is available per square foot.

3. Importance of BTU per sq ft Calculation

Details: Proper heating distribution ensures comfortable temperatures, energy efficiency, and prevents overworking heating systems.

4. Using the Calculator

Tips: Enter the total BTU output of your heating system and the area to be heated. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU per sq ft value?
A: Most homes require 20-30 BTU per sq ft, but this varies by climate, insulation, and room type.

Q2: How do I find my system's total BTU?
A: Check your furnace or boiler specifications, or sum the BTU outputs of all heating units.

Q3: Should all rooms have the same BTU/sq ft?
A: No, bathrooms and kitchens often need more (40-50 BTU/sq ft), while bedrooms may need less.

Q4: Does this account for heat loss?
A: No, this is a basic calculation. For accurate sizing, consider insulation, windows, and climate factors.

Q5: What if my result is too high or low?
A: Values significantly outside 20-50 BTU/sq ft may indicate undersized or oversized heating systems.