u-value calculation on wood windows and doors

U Value Calculator Logo
timber framed wood windows

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.

Our U Value calculator is a whole window calculator designed to calculate an accurate U-Value of windows and doors. This calculated value conforms to European Standard EN ISO 10077. This standard applies in Scotland and England. Our calculator is primarily intended for use with wooden windows and doors. These can be made from hardwood or softwood, of any size with double or triple glazing. If you can provide us with the u value of any other type of frame you are using we can provide a u value for that too. Our uvalue calculator is not restricted to products manufactured by one company.

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 four page 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.