The Heat Transfer Calculator determines the rate of heat flow through a material using the formula Q=k×A×(ΔT/d)Q = k × A × (ΔT / d)Q=k×A×(ΔT/d). Here, kkk represents the thermal conductivity of the material, AAA is the cross-sectional area, ΔTΔTΔT is the temperature difference across the material, and ddd is its thickness. This calculator helps engineers, students, and scientists analyze how efficiently heat is transferred through different materials, making it useful in thermal engineering, insulation design, and energy efficiency studies.