ChangePlan's Free Simple U Value Calculator (2024)

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Disclaimer: We hope to provide an accurate and useful service, but any reliance you place on the information provided on this site is strictly at your own risk. Whilst the information and/or specification contained herein is to the best of our knowledge true and accurate we specifically exclude any liability for errors, omissions or otherwise arising therefrom. Details, practices, principles, values and calculations should be verified as to accuracy and suitability for the required purpose for use. No responsibility for the accuracy of this data or your use or reference to it is accepted by ChangePlan Ltd or any of the parties involved in creating or providing this service.

U-Value Calculator for calculating U Values in building construction projects.
This Simple U-Value Calculator can help you quickly check your designs or plans to see if they are likely to achieve BS EN ISO 6946 2017 compliance.
A useful tool for designers, architects and the general public to quickly calculate the u-values of different elements within a building.
U-Value Calculator Version 3.70

Developed by: ChangePlan Ltd & Black Squirrel Computers [PHP MySql Web Developer Hertfordshire]

Provided by ChangePlan Ltd www.changeplan.co.uk/u_value_calculator.php
U-Value Calculator Version 3.70
Printed:07-06-2024 08:40

U-Value Calculator
We aim to provide this U-Value Calculator as a handy tool for checking the heat transfer of your building structure designs and plans. As part of on-going developments we will be rolling out a series of updates to create a set of free, useful tools for everyone including designers, architects and engineers.

Please bookmark this page and share it with anyone who might find it useful.

Changes in this update v3.70:

  • The calculator has become multilingual
  • Languages available at the momemnt are English, French, Spanish, Italian & German.
  • Translations are from Google's Translate. We appologise for any errors.
  • If you would like to have your language added, please contact us.

Changes in update v3.60:

    Changes in update v3.40:

      Changes in update v3.30:

        Changes in update v3.20:

          Changes in update v3.10:

            Changes in update v3.03:

              Changes in update v3.02:

                Changes in update v2.00:

                  Future updates:

                  • Ability to save your projects as an ebook, for sharing etc.
                  • New materials are being continually added as they become available.
                  • Ability for users to define and save prefered default settings.
                  • Ongoing support for new mobile devices.

                  Contact

                  If you have found a bug or have any comments or suggestions, please click the envelope icon on the main page to send us a message.
                  ChangePlan U-Value Calculator Icon Menu
                  How to use the U-Value Calculator.

                  Please bookmark this page and share it with anyone who might find it useful.
                  Please click here to load a demo calculation.
                  External Wall
                  Pitched Roof (warm)
                  Ground Floor (floating)

                  ChangePlan's Free Simple U Value Calculator (4)Manage Projects and U-Value Calculations.

                    ChangePlan's Free Simple U Value Calculator (5)New U-Value Calculation.

                      ChangePlan's Free Simple U Value Calculator (6)Save a U-Value Calculation.

                        ChangePlan's Free Simple U Value Calculator (7)Delete a U-Value Calculation.

                          ChangePlan's Free Simple U Value Calculator (8)Logout.

                            ChangePlan's Free Simple U Value Calculator (9)Logout.

                              ChangePlan's Free Simple U Value Calculator (10)Print a U-Value Calculation.

                                ChangePlan's Free Simple U Value Calculator (11)Contact Us.

                                  ChangePlan's Free Simple U Value Calculator (12)Material Selection

                                    ChangePlan's Free Simple U Value Calculator (13)Material Search

                                      ChangePlan's Free Simple U Value Calculator (14)Information about the U-Value Calculator.

                                        ChangePlan's Free Simple U Value Calculator (15)This help screen.

                                          If you have found a bug or have any comments or suggestions, please click the envelope icon on the main page to send us a message.

                                          Current Environmental Settings

                                          Internal Temp

                                          External Temp

                                          Relative Humidity

                                          Dew Point

                                          Project and U-Value Calculation Manager Icon Menu
                                          How to use the Project and U-Value Calculation Manager.

                                          ChangePlan's Free Simple U Value Calculator (16)Delete a Project or U-Value Calculation.

                                            ChangePlan's Free Simple U Value Calculator (17)Load a Saved U-Value Calculation.

                                              ChangePlan's Free Simple U Value Calculator (18)Copy a Saved U-Value Calculation.

                                                ChangePlan's Free Simple U Value Calculator (19)Share a Saved U-Value Calculation.

                                                  ChangePlan's Free Simple U Value Calculator (20)Default Settings.

                                                    ChangePlan's Free Simple U Value Calculator (21)This help screen.

                                                      If you have found a bug or have any comments or suggestions, please click the envelope icon on the main page to send us a message.

                                                      ChangePlan's Free Simple U Value Calculator (2024)

                                                      FAQs

                                                      How do I calculate the U-value? ›

                                                      This gives a thermal resistance of 5.263 m2K/W. You can then calculate a basic U-value using the following formula: 1 / (Sum of the R-values of all the elements which make up the construction).

                                                      What is the U-value for dummies? ›

                                                      Thermal transmittance, also known as U-value, is the rate of transfer of heat through a structure (which can be a single material or a composite), divided by the difference in temperature across that structure. The units of measurement are W/m²K. The better-insulated a structure is, the lower the U-value will be.

                                                      What is the U-value of PIR insulation? ›

                                                      General Purpose PIR Insulation Board. General Purpose PIR is a standard foil-faced insulation board. General purpose PIR boards have wide applicability including pitched roofs, timber frames, floors, walls etc. They typically have a u-value of 0.022 W/mK.

                                                      How do you get 0.18 U-value for walls? ›

                                                      To meet 0.18 W/m2K, cavity walls will need either a full-fill cavity, additional internal insulation or have a cavity greater than 100 mm.

                                                      How do you calculate change in U? ›

                                                      Delta U is the change in internal energy of a system. To calculate this, since energy can be lost or gained through heat and work, we would add heat and work with the equation being Delta U = q (heat) + w (work).

                                                      What is the formula for the average U-value? ›

                                                      The formula for U value calculation reads: U = 1/Rtotal where Rtotal is the sum of thermal resistance from all layers. Further R= d/λ where d= material thickness and λ is thermal conductivity.

                                                      What is an example of a U-value? ›

                                                      For example, a double glazed window with a U-value of 2.8, means that for every degree difference in temperature between the inside and outside of the window, 2.8 watts will be transmitted every square metre. A range of typical U-values are: Solid brick wall: 2 W/(m²K) Cavity wall with no insulation: 1.5 W/(m²K).

                                                      What is the minimum U-value for walls? ›

                                                      For existing elements within existing dwellings, the regulations provide limiting U values, setting a baseline for the minimum acceptable level of insulation: Roofs: 0.16 W/m²K. Walls: 0.30 W/m²K. Floors: 0.25 W/m²K.

                                                      Is it better to have a higher or lower U-value? ›

                                                      U-values can tell you how well an insulating glass unit (IGU) will hold in heated or cooled air. The lower the number, the better the insulating performance. U-values generally range from 0.1 (very little heat loss) to 1.0 (high heat loss).

                                                      What insulation has the highest U-value? ›

                                                      Insulation Values of Materials
                                                      Insulation MaterialU-Value (W/m²K) Range
                                                      Extruded Polystyrene foam Insulation (XPS Insulation)0.028 - 0.038
                                                      Polyisocyanurate Insulation (PIR) and Polyurethane (PUR) Foam0.022 - 0.028
                                                      Cellulose Insulation (Recycled Paper Fibers)0.036 - 0.042
                                                      Reflective Foil Insulation (Multifoil)0.036 - 0.040
                                                      3 more rows

                                                      How thick should insulation be for walls? ›

                                                      In the walls: Typically, there is not an abundance of space inside your walls, so packing in the insulation isn't a bad idea. To get an R-value of 13 to 16, you will need four to five inches of insulation. However, if you use a more effective type of insulation, you may be able to get away with less.

                                                      What thickness of PIR insulation do I need? ›

                                                      The recommended thickness for PIR insulation in floors is typically around 100mm to achieve the recommended U-value of 0.25 W/m2K. The recommended thickness for PIR insulation in walls is typically around 125mm to achieve the recommended U-value of 0.17 W/m2K.

                                                      How to calculate U-value? ›

                                                      U Value is the reciprocal of all resistances of the materials found in the building element. To calculate the U-Value of the building element, the R-Value of all the different components that make up that element will be considered. U-Value (of building element) = 1 / (Rso + Rsi + R1 + R2 …)

                                                      How to increase U-value? ›

                                                      Some options for improving U values in existing buildings include: Adding insulation: Insulation is one of the most effective ways to improve U values and reduce heat loss.

                                                      Is 0.15 U-value good? ›

                                                      Walls: In colder climates, U-values around 0.15 W/m²K or lower are desirable for external walls. For internal walls, U-values around 0.3 W/m²K or lower are recommended. Roofs: U-values for roofs should aim for around 0.1 W/m²K or lower, especially in colder regions.

                                                      How do I figure out how many rolls of insulation I need? ›

                                                      To calculate how much insulation material to purchase, simply divide your attic's square footage by the square footage of insulation in the manufacturer's package (assuming you're purchasing pre-cut batts or rolls).

                                                      What is the U-value number? ›

                                                      A U-value value shows, in units of W/m²K, the ability of an element to transmit heat from a warm space to a cold space in a building, and vice versa. The lower the U-value, the better insulated the building element.

                                                      Who can produce a U-value calculation? ›

                                                      The conventions require a u-value calculation to be produced by someone who is suitably competent and experienced. Membership of the Elmhurst competency scheme will demonstrate that you are part of an industry recognised scheme.

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