Manufacturer provided DPI vs ES Task Manager displayed DPI












0















I am a web developer and I am looking for an android phone below Rs. 10,000 for my development purpose which should have 360x640 viewport size.



I don't find any phone manufacturers specifying viewport size in specifications. So, I decided to calculate viewport size with manufacturer provided information like screen resolution and dpi.



I have a Samsung J7 Max android phone. I used this phone to find a method to calculate viewport size.



Below is the example phone specification:



Model: Samsung J7 Max



Screen Resolution: 1080x1920



DPI or PPI: 386



Refer this site for full specification: https://www.gsmarena.com/samsung_galaxy_j7_max-8684.php



I Googled and found below formula to calculate the viewport size.



dp = px / (dpi / 160)


This is how my calculation was,



Width:

dp = 1080 / (386 / 160)

dp = 448



Height:

dp = 1920 / (386 / 160)

dp = 796


So, the viewport size would be 448x796.



Now I opened http://whatismyscreenresolution.net/ in my mobile browser to check the viewport size. And it returned 412x732.



??????



Calculated viewport size: 448x796



Browser viewport size: 412x732



The calculated viewport size is different from the viewport size displayed in the browser.



So I went back to my calculation and checked every number. But I couldn't spot out what was wrong.



I installed ES Task manager app in my phone to verify dpi. Surprisingly it showed 420dpi, where 386dpi was in phone specification.



Now I performed the same calculation with dpi as 420(ES Task manager displayed dpi value).



Width:

dp = 1080 / (420 / 160)

dp = 412



Height:

dp = 1920 / (420 / 160)

dp = 732


Now calculated viewport size matched the browser(412x732).



Now my question is,




  1. What is Manufacturer provided dpi value(386) and ES Task manager displayed dpi value(420)?

  2. How to come up with a number 420 from the manufacturer provided information?! so that I can match the browser viewport size?!


Thanks a lot!






android browser viewport dpi







share|improve this question



























    0















    I am a web developer and I am looking for an android phone below Rs. 10,000 for my development purpose which should have 360x640 viewport size.



    I don't find any phone manufacturers specifying viewport size in specifications. So, I decided to calculate viewport size with manufacturer provided information like screen resolution and dpi.



    I have a Samsung J7 Max android phone. I used this phone to find a method to calculate viewport size.



    Below is the example phone specification:



    Model: Samsung J7 Max



    Screen Resolution: 1080x1920



    DPI or PPI: 386



    Refer this site for full specification: https://www.gsmarena.com/samsung_galaxy_j7_max-8684.php



    I Googled and found below formula to calculate the viewport size.



    dp = px / (dpi / 160)


    This is how my calculation was,



    Width:
    
dp = 1080 / (386 / 160)
    
dp = 448
    

    
Height:
    
dp = 1920 / (386 / 160)
    
dp = 796


    So, the viewport size would be 448x796.



    Now I opened http://whatismyscreenresolution.net/ in my mobile browser to check the viewport size. And it returned 412x732.



    ??????



    Calculated viewport size: 448x796



    Browser viewport size: 412x732



    The calculated viewport size is different from the viewport size displayed in the browser.



    So I went back to my calculation and checked every number. But I couldn't spot out what was wrong.



    I installed ES Task manager app in my phone to verify dpi. Surprisingly it showed 420dpi, where 386dpi was in phone specification.



    Now I performed the same calculation with dpi as 420(ES Task manager displayed dpi value).



    Width:
    
dp = 1080 / (420 / 160)
    
dp = 412
    

    
Height:
    
dp = 1920 / (420 / 160)
    
dp = 732


    Now calculated viewport size matched the browser(412x732).



    Now my question is,




    1. What is Manufacturer provided dpi value(386) and ES Task manager displayed dpi value(420)?

    2. How to come up with a number 420 from the manufacturer provided information?! so that I can match the browser viewport size?!


    Thanks a lot!






    android browser viewport dpi







    share|improve this question

























      0












      0








      0








      I am a web developer and I am looking for an android phone below Rs. 10,000 for my development purpose which should have 360x640 viewport size.



      I don't find any phone manufacturers specifying viewport size in specifications. So, I decided to calculate viewport size with manufacturer provided information like screen resolution and dpi.



      I have a Samsung J7 Max android phone. I used this phone to find a method to calculate viewport size.



      Below is the example phone specification:



      Model: Samsung J7 Max



      Screen Resolution: 1080x1920



      DPI or PPI: 386



      Refer this site for full specification: https://www.gsmarena.com/samsung_galaxy_j7_max-8684.php



      I Googled and found below formula to calculate the viewport size.



      dp = px / (dpi / 160)


      This is how my calculation was,



      Width:
      
dp = 1080 / (386 / 160)
      
dp = 448
      

      
Height:
      
dp = 1920 / (386 / 160)
      
dp = 796


      So, the viewport size would be 448x796.



      Now I opened http://whatismyscreenresolution.net/ in my mobile browser to check the viewport size. And it returned 412x732.



      ??????



      Calculated viewport size: 448x796



      Browser viewport size: 412x732



      The calculated viewport size is different from the viewport size displayed in the browser.



      So I went back to my calculation and checked every number. But I couldn't spot out what was wrong.



      I installed ES Task manager app in my phone to verify dpi. Surprisingly it showed 420dpi, where 386dpi was in phone specification.



      Now I performed the same calculation with dpi as 420(ES Task manager displayed dpi value).



      Width:
      
dp = 1080 / (420 / 160)
      
dp = 412
      

      
Height:
      
dp = 1920 / (420 / 160)
      
dp = 732


      Now calculated viewport size matched the browser(412x732).



      Now my question is,




      1. What is Manufacturer provided dpi value(386) and ES Task manager displayed dpi value(420)?

      2. How to come up with a number 420 from the manufacturer provided information?! so that I can match the browser viewport size?!


      Thanks a lot!






      android browser viewport dpi







      share|improve this question














      I am a web developer and I am looking for an android phone below Rs. 10,000 for my development purpose which should have 360x640 viewport size.



      I don't find any phone manufacturers specifying viewport size in specifications. So, I decided to calculate viewport size with manufacturer provided information like screen resolution and dpi.



      I have a Samsung J7 Max android phone. I used this phone to find a method to calculate viewport size.



      Below is the example phone specification:



      Model: Samsung J7 Max



      Screen Resolution: 1080x1920



      DPI or PPI: 386



      Refer this site for full specification: https://www.gsmarena.com/samsung_galaxy_j7_max-8684.php



      I Googled and found below formula to calculate the viewport size.



      dp = px / (dpi / 160)


      This is how my calculation was,



      Width:
      
dp = 1080 / (386 / 160)
      
dp = 448
      

      
Height:
      
dp = 1920 / (386 / 160)
      
dp = 796


      So, the viewport size would be 448x796.



      Now I opened http://whatismyscreenresolution.net/ in my mobile browser to check the viewport size. And it returned 412x732.



      ??????



      Calculated viewport size: 448x796



      Browser viewport size: 412x732



      The calculated viewport size is different from the viewport size displayed in the browser.



      So I went back to my calculation and checked every number. But I couldn't spot out what was wrong.



      I installed ES Task manager app in my phone to verify dpi. Surprisingly it showed 420dpi, where 386dpi was in phone specification.



      Now I performed the same calculation with dpi as 420(ES Task manager displayed dpi value).



      Width:
      
dp = 1080 / (420 / 160)
      
dp = 412
      

      
Height:
      
dp = 1920 / (420 / 160)
      
dp = 732


      Now calculated viewport size matched the browser(412x732).



      Now my question is,




      1. What is Manufacturer provided dpi value(386) and ES Task manager displayed dpi value(420)?

      2. How to come up with a number 420 from the manufacturer provided information?! so that I can match the browser viewport size?!


      Thanks a lot!






      android browser viewport dpi




      android browser viewport dpi






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      asked Nov 15 '18 at 3:57









      Jeffrin Manova PrabaharJeffrin Manova Prabahar

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