Use this construction calculation for preliminary quantity, geometry, material, load, or coverage planning when dimensions and units have been measured consistently.

Total SI R-value (m²·K/W)

Required number input.

Convert total SI R-value of an assembly to its reciprocal U-value; include surface films in R if needed. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Thermal transmittance (W/(m²·K))

The resulting thermal transmittance returned as a number.

• Nominal R- and U-values do not by themselves capture thermal bridges, air leakage, moisture, compression, installation gaps, surface films, aging, or whole-assembly performance. Energy-code compliance requires the prescribed assembly method.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Verify dimensions on site, use current product data and local code requirements, include an explicit waste or safety allowance where appropriate, and obtain qualified structural, electrical, plumbing, or geotechnical review when required.

• Insulation Heat Loss

  Calculate steady-state conductive heat-transfer rate through an assembly from U-value, area, and temperature difference.

• Insulation Thickness From Rvalue

  Homogeneous insulation thickness from target area-specific R-value and material thermal conductivity in SI units.

• Concrete Cost Per Yard

  Calculate concrete material cost per cubic yard by dividing total cost by delivered cubic yards; placement labor is included only if entered in total cost.