Thermal Conductivity Calculator

Heat Flow Rate (Q) - Watts

Material Thickness (L) - Meters

Surface Area (A) - m²

Temp. Difference (ΔT) - K or °C

The Thermal Conductivity (k) is:

0.00

W/(m·K)

What is Thermal Conductivity?

Thermal conductivity is a physical property of materials that measures their ability to conduct heat. Quantitatively, it represents the rate at which heat flows through a unit thickness of a material per unit area, given a unit temperature gradient. In the International System of Units (SI), it is measured in Watts per meter-Kelvin (W/m·K).

High thermal conductivity materials, like copper and aluminum, are used in heat sinks and cooling systems because they transfer energy rapidly. Conversely, low thermal conductivity materials, such as fiberglass or polystyrene, serve as excellent insulators, helping to maintain temperatures by slowing down heat transfer.

How to Use the Thermal Conductivity Calculator

Our calculator uses Fourier's Law of Heat Conduction to determine the conductivity of a material. To get an accurate result, you will need four specific data points:

Heat Flow Rate (Q): The amount of heat energy transferred per unit of time, measured in Watts (W).
Thickness (L): The distance through which the heat is traveling, measured in meters (m).
Area (A): The cross-sectional surface area perpendicular to the heat flow, in square meters (m²).
Temperature Difference (ΔT): The absolute difference in temperature between the hot and cold sides.

The Formula

The mathematical expression used by this tool is: k = (Q × L) / (A × ΔT). Where 'k' represents the thermal conductivity coefficient. By rearranging this formula, engineers can also solve for heat loss or required insulation thickness in construction and manufacturing projects.

Frequently Asked Questions

Does temperature affect thermal conductivity? Yes, for most materials, thermal conductivity varies with temperature. Metals usually see a decrease in conductivity as temperature rises, while gases often see an increase.

What is the difference between Thermal Conductivity and Thermal Resistance? While conductivity measures how easily heat moves through a material, thermal resistance (R-value) measures how much a material opposes the flow of heat.