This report presents a new calculation method to calculate the U-value of revolving doors. The calculation method is developed based on EN ISO 10077-1:2017 and EN ISO 10077-2:2017 standards, being used for calculating the U-value of doors and windows. Additionally, the EN 10211:2017 standard is exploited to calculate certain thermal bridges (Psi-values). The calculation method is developed by performing: 1. An analysis to identify the different heat flow paths 2. Frame calculations for the revolving part 3. Psi (ψ) calculations for the revolving part 4. Air cavity calculations 5. Frame calculation for the canopy part 6. Psi (ψ) calculation for the canopy part 7. U-value calculation for the complete door