BTU Heat Calculator Sq Ft

BTU Heat Formula:

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

Heat Output (BTU/h):

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1. What is a BTU Heat Calculator Sq Ft?

Definition: This calculator estimates the heating BTU (British Thermal Units) required based on square footage, BTU per square foot, and a correction factor.

Purpose: It helps HVAC professionals and homeowners determine heating requirements for spaces.

2. How Does the Calculator Work?

The calculator uses the formula:

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

Where:

\( Q \) — Heat output (BTU/h)
\( A \) — Area (square feet)
\( \text{BTU/ft}^2 \) — BTU per square foot per hour
\( F \) — Correction factor

Explanation: The area is multiplied by the BTU requirement per square foot, then adjusted by the factor for specific conditions.

3. Importance of BTU Calculation

Details: Proper BTU estimation ensures adequate heating, energy efficiency, and proper HVAC system sizing.

4. Using the Calculator

Tips: Enter the area in square feet, BTU per square foot (default 20 BTU/h·ft²), and correction factor (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU per square foot value?
A: Most spaces require 20 BTU per square foot, but this varies by climate (30-40 BTU/ft² in cold areas, 10-15 in mild climates).

Q2: When would I change the correction factor?
A: Adjust for room height (>8ft ceilings), insulation quality, window area, or room type (bathrooms often need more heat).

Q3: How does this relate to furnace sizing?
A: The calculated BTU helps determine the appropriate furnace or heater capacity needed for the space.

Q4: Does this account for heat loss?
A: The factor can be increased to account for significant heat loss through walls, windows, or poor insulation.

Q5: How do I convert BTU to other units?
A: 1 BTU/h ≈ 0.293 watts. For kW, divide BTU/h by 3412.