U-value for windows and doors
Whole Window U Value Calculator
Calculator for Windows and Doors
Our U Value Calculator is designed to work out the u-value of various designs of windows and doors. It can be a single paned window/door, or one with a number of panes of glass.
Whole Window U Values
We do not just supply a u-value taken from the centre point of the glass or the centre of a window panel. This is a whole window calculator that works out the combined u value of the glazing, the frame and the spacer.
Our calculator does not restrict you to using products from any one manufacturer. We can calculate the u value of single, double or triple glazed windows built with softwood, hardwood or upvc frames.
We can make adjustments for Window and Doors with or without Spacers and any Thermal bridges used in the installation.
No Membership Required
You do not need to be a member of our website to make use of our calculator. It is open to use by anyone.
Conforms to European Standard EN ISO 10077
Our U Value Calculator will provide you with a calculation that is performed in accordance with the U-Value equation provided in European Standard EN ISO 10077. It will provide an accurate u-value that will satisfy your building control.
U Value Certificate
On submitting the required details to us and on receipt of the necessary payment, we will calculate your U-value and send you a certificate with a unique serial number for that window or door. You can then use that certificate to demonstrate compliance with Building Regulations depending on the U-values that were obtained.