Heat Loss Calculator

Input Parameters

Imperial (°F, BTU, ft)SI (°C, kW, m)

Area (sq ft)

U-Value (BTU/hr·ft²·°F)

Indoor Temperature (°F)

Outdoor Temperature (°F)

Enable Dynamic Analysis

21,000

Heat Loss BTU/hr

Heat Loss per Area BTU/hr/sq ft

Temperature Difference70 °F

U-Value0.3 BTU/hr·ft²·°F

Area1,000 sq ft

Formula:

\Delta T = T_{indoor} - T_{outdoor}

Calculation:

\Delta T = 70 - 0

Result:

70.00 \text{ °F}

Formula:

Q = A \times U \times \Delta T

Calculation:

Q = 1000.00 \times 0.30 \times 70.00

Result:

21000.00 \text{ BTU/hr}

Formula:

Q/A = \frac{Q}{A}

Calculation:

Q/A = \frac{21000.00}{1000.00}

Result:

21.00 \text{ BTU/hr/sq ft}