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Your simple to use online
U-value and Acoustic calculator
for windows and doors
Oracle is the complete online calculator and compliance information site for window & door fabricators, installation companies and insulated glass unit manufacturers.
acoustic calculator
Acoustic calculator for Windows

Quickly and Accurately calculate acoustic values for Windows

u value calculator
U-value calculator for windows and doors.

Building Control compliance, FENSA & Certass approved

ce marking
CE Marking 5 Step guide

CE Mark Doors and Windows with our 5 Step Guide

How it works
Calculations from the Oracle online U-value calculator are recognised by FENSA and Certass for their competent person schemes.

Once subscribed it’s quick and easy to assess product performance and is pre-loaded with product data for many popular window and door set suites from major PVCu window system companies and composite door system manufacturers.

Learn more about Oracle
System company data pre-loaded on the Oracle
What our clients say
Thank you brilliant service from you guys. I can't tell you how much that had helped me out this week !
Steve Cooke
We strive to pioneer and produce the most technical and aesthetically accurate sash window as possible. This means thoroughly testing new designs and manufacturing techniques before bringing innovations to market. Being able to work with a Professional but flexible organisation like Build Check, to test these innovations to the appropriate standards and to develop new techniques where a standard doesn't exist is a cost effective and essential service in the R&D project.
Ramon Rabett - Technical Director at Master Frame