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W' Balance (W Prime Balance)


This data field display your W' Balance (%) live during a ride. This value is displayed into the GoldenCheetah software, and well described on the video here: </p><p></p><p>Check all the details on my blog:</p><p></p><p>It needs 3 parameters: your Wprime value (in joules) and your Critical Power (CP) in watts. You can choose also the formula used to compute the data (starting with version 1.2). Use GoldenCheetah to help you find the correct values if you don't know them. Of course, a compatible powermeter is required.</p>

What’s New

What's new with version 2.3.5:</p><p>- Support for Edge 540/840</p><p></p><p>What's new with version 2.3.4:</p><p>- Supports Forerunner 265 / 265S / 965</p><p></p><p>What's new with version 2.3.2:</p><p>- Supports Forerunner 255/255 Music/255S/255S Music/955/955 Solar, Edge 1040/1040 Solar</p><p></p><p>What's new with version 2.3.1:</p><p>- Supports fenix 7 series, Epix gen 2 series, and Mk2 and other new devices</p>

Additional Information


This app requires access to:

  • Run in the background when it is not active (potentially affecting battery life)
  • Record additional information into activity files
  • Your Garmin Connect™ fitness profile
  • D2™ Air D2™ Air
  • D2™ Bravo D2™ Bravo
  • D2™ Charlie D2™ Charlie
  • D2™ Delta D2™ Delta
  • D2™ Delta PX D2™ Delta PX
  • D2™ Delta S D2™ Delta S
  • Descent™ Mk1 Descent™ Mk1
  • Descent™ MK2 Descent™ MK2, Descent™MK2i
  • Descent™ Mk2S Descent™ Mk2S
  • Edge® 1030 Edge® 1030
  • Edge® 1030 Plus Edge® 1030 Plus
  • Edge® 1030, Bontrager Edge® 1030, Bontrager
  • Edge® 1040 Edge® 1040
  • Edge® 130 Edge® 130
  • Edge® 130 Plus Edge® 130 Plus
  • Edge® 520 Plus Edge® 520 Plus
  • Edge® 530 Edge® 530
  • Edge® 540 Edge® 540
  • Edge® 820 Edge® 820
  • Edge® 830 Edge® 830
  • Edge® 840 Edge® 840
  • Edge® Explore 820 Edge® Explore 820
  • Enduro™ Enduro™
  • Enduro™ 2 Enduro™ 2
  • epix™ epix™
  • epix™ (Gen 2) epix™ (Gen 2), quatix® 7 – Sapphire Edition
  • ForeAthlete® 735XTJ ForeAthlete® 735XTJ
  • ForeAthlete® 920XTJ ForeAthlete® 920XTJ
  • Forerunner® 255 Forerunner® 255
  • Forerunner® 255 Music Forerunner® 255 Music
  • Forerunner® 255S Forerunner® 255S
  • Forerunner® 255S Music Forerunner® 255S Music
  • Forerunner® 265 Forerunner® 265
  • Forerunner® 265S Forerunner® 265S
  • Forerunner® 735XT Forerunner® 735XT
  • Forerunner® 745 Forerunner® 745
  • Forerunner® 920XT Forerunner® 920XT
  • Forerunner® 935 Forerunner® 935
  • Forerunner® 945 Forerunner® 945
  • Forerunner® 945 LTE Forerunner® 945 LTE
  • Forerunner® 955 Forerunner® 955, Forerunner® 955 Solar
  • Forerunner® 965 Forerunner® 965
  • fēnix® 3 fēnix® 3, quatix® 3, tactix® Bravo
  • fēnix® 5 fēnix® 5, quatix® 5
  • fēnix® 5 Plus fēnix® 5 Plus
  • fēnix® 5S fēnix® 5S
  • fēnix® 5S Plus fēnix® 5S Plus
  • fēnix® 5X fēnix® 5X, tactix® Charlie
  • fēnix® 5X Plus fēnix® 5X Plus
  • fēnix® 6 fēnix® 6
  • fēnix® 6 Dual Power fēnix® 6 Dual Power
  • fēnix® 6 Pro fēnix® 6 Pro, fēnix® 6 Sapphire
  • fēnix® 6 Pro Dual Power fēnix® 6 Pro Dual Power
  • fēnix® 6 Pro Solar fēnix® 6 Pro Solar
  • fēnix® 6 Solar fēnix® 6 Solar
  • fēnix® 6S fēnix® 6S
  • fēnix® 6S Dual Power fēnix® 6S Dual Power
  • fēnix® 6S Pro fēnix® 6S Pro, fēnix® 6S Sapphire
  • fēnix® 6S Pro Dual Power fēnix® 6S Pro Dual Power
  • fēnix® 6S Pro Solar fēnix® 6S Pro Solar
  • fēnix® 6S Solar fēnix® 6S Solar
  • fēnix® 6X Pro fēnix® 6X Pro, fēnix® 6X Sapphire, fēnix® 6X Pro Solar, tactix® Delta Sapphire, quatix® 6X Solar, tactix® Delta Solar, tactix® Delta Solar Ballistics
  • fēnix® 7 fēnix® 7, fēnix® 7– Sapphire Solar Edition, fēnix® 7 Solar, quatix® 7
  • fēnix® 7 Pro fēnix® 7 Pro, fēnix® 7 Pro – Solar Edition, fēnix® 7 Pro – Sapphire Solar Edition
  • fēnix® 7 Pro – Solar Edition (No Wi-Fi®) fēnix® 7 Pro – Solar Edition (No Wi-Fi®)
  • fēnix® 7S fēnix® 7S, fēnix® 7S– Solar Edition, fēnix® 7S– Sapphire Solar Edition
  • fēnix® 7S Pro fēnix® 7S Pro, fēnix® 7S Pro– Sapphire Solar Edition
  • fēnix® 7X fēnix® 7X, fēnix® 7X - Solar Edition, fēnix® 7X– Sapphire Solar Edition, quatix® 7X – Solar Edition
  • fēnix® 7X Pro fēnix® 7X Pro, fēnix® 7X Pro– Sapphire Solar Edition
  • fēnix® 7X Pro No Wi-Fi fēnix® 7X Pro No Wi-Fi
  • fēnix® Chronos fēnix® Chronos
  • MARQ™ Adventurer MARQ™ Adventurer
  • MARQ™ Athlete MARQ™ Athlete
  • MARQ™ Aviator MARQ™ Aviator
  • MARQ™ Captain MARQ™ Captain, MARQ™ Captain: American Magic Edition
  • MARQ™ Commander MARQ™ Commander
  • MARQ™ Driver MARQ™ Driver
  • MARQ™ Expedition MARQ™ Expedition
  • MARQ™ Golfer MARQ™ Golfer
  • quatix® 6 quatix® 6
  • quatix® 6X quatix® 6X, quatix® 6X Solar, quatix® 6X Dual Power
  • tactix® 7 tactix® 7, tactix® 7 – Pro Ballistics Edition, tactix® 7 – Pro Edition
Average Rating: (55 Ratings)

johan rodriguez
October 10, 2023 | Version 2.3.5

bonjour, je viens de telecharger et synchroniser w' balance sur mon edge 530. Des que je mets le w' sur mon ecran d'affichage: je n'ai pas le pourcentage mais les infos suivantes en permanence: C|300|26000|TTE:0 si vous pouviez m'apporter une reponse, je vous remercie d'avance

David Cooper
April 21, 2023 | Version 2.3.5

Love this data field. If you use critical power this is a must have APP.

September 8, 2022 | Version 2.3.2

Awesome tool for training! Is it possible to make it work with an Edge 520? Only found the "Dr. Skiba" App, but that one isnt that accurate for me. Maybe it is still the "differential" version.

February 14, 2022 | Version 2.3.1

Well,I want to know:What is rftp?It means run ftp?could you tell me?TKS

Pedro Jav
February 3, 2022 | Version 2.3.1

the app is simply no longer working on a fenix 6x pro (it used to work 1 year ago and it was great)

January 24, 2022 | Version 2.3.1

Thank you very much for including the Forerunner 745! But I can't get it to work. The initial value of 100% is not modified. Do I have to set the clock in any specific mode?

Dave Penlington
December 7, 2021 | Version 2.2.1

This was a great app allowing me to use realtime WBal data to push myself on Indoor sessions but lately I cannot get it to work even if I put my FTP at an artificially low figure. Might be my finger trouble rather than the app.

November 17, 2021 | Version 2.2.1

When will it be available on the Garmin Forerunner 745? I think it is necessary now!

David Wong
November 15, 2021 | Version 2.2.1

As a data nerd(presumably like many other cyclists) I really love this data shown live on screen, and may I suggest is it possible to add function to record Total kj (over CP) consumed during the whole ride? It would be quite a useful metric to quantity how cyclists cope with anaerobic efforts...... maybe it's just me too greedy lol

Developer Reply
November 16, 2021, nakan

Hi David, Thanks for your feedback. Actually, as far as I know, all Garmin devices which support native cycling power already record and display the total kj of a ride in the summary on Garmin Connect. Do you need anything else as recorded data?

February 28, 2021 | Version 2.2.1

Can't make it work with Garmin Pod for running...any idea why? thanks!

Developer Reply
February 28, 2021, nakan

This datafield is not designed to wirk with Garmin Running Power as Garmin don't provide any power data to external apps.

Dave Penlington
January 10, 2021 | Version 2.2.1

Great Widget. Using the estimated time to zero W Prime in indoor BKOOL HIIT velodrome sessions with the goal to get to, and below Zero Prime before the lap end. Brilliant and exhausting.

Ariel Popovsky
November 16, 2020 | Version 2.2.1

Having this field available while you ride is really useful.

October 27, 2020 | Version 2.2.1


Richard Advocaat
August 29, 2020 | Version 2.2.1

This datafield is the most usefull of them all. Now you have a fuelgauche on your device! Keep up the good work Nakan!

Jean Francois DONNAY
June 29, 2020 | Version 2.2.1

Fonctionne parfaitement sur l'Edge 1030 Plus Works perfectly on the Edge 1030 Plus

Robert Budde
June 15, 2020 | Version 2.2.1

Recent version (2.2.1) sometimes shows "NaN" or "Inf" on a Edge 830. With my old Edge 520, everything is fine and I really like the app. PLEASE upload the latest source to GitHub so users can help sorting out bugs!

Marvin Faure
May 21, 2020 | Version 2.2.1

New version doesn't work on 520

May 1, 2020 | Version 2.2.1

No conseguía vincularlo con mi Garmin 1030, pero porque no sabía que había que entrar a: perfil - pantalla de datos - añadir nueva pantalla de datos -añadir nueva pantalla pantalla de datos - Connect IQ - y seleccionar w' balance

Hanyu Ou
April 4, 2020 | Version 2.2.1

Recommended by Yunfei Wu. 吴云飞推荐的

Yannick Martinez
February 18, 2020 | Version 2.2.1

Dommage que l'on ne puisse plus voir sur analyse après entraînement la fonction en pourcentage comme sur le compteur que sa soit sur Garmin connect ou sur goldencheeta

David Findura
December 29, 2019 | Version 2.2.1

The previous version was good. Unfortunately the new version does not work on my Edge 520 so I had to find another app.

Omar Awad
November 4, 2019 | Version 2.2.1

Well made. Great added info

November 2, 2019 | Version 2.2.1

Version 2.2.1 does'nt work on my Garmin Edge 1000 ??

David Findura
June 23, 2019 | Version 2.1.2

Seems to accurately reflect what I'm feeling. It's nice to see how my energy is used. What's the app shown on the picture of the 520 with the data field "matches"?

Omar Awad
April 21, 2019 | Version 2.1.1

I absolutely love knowing how much fuel is left in the tank and when I’m ready for another tough effort