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### Pixel Density: Explained!

by Marques Brownlee • 131,448 views

Thumbs up if you learned something! More info and devices: http://goo.gl/4Brfl Upvote on Reddit: http://goo.gl/48JoE ~ http://twitter.com/MKBHD http://gplus.to/MKBHD...

"I wouldn't bet on a Retina Macbook Pro" Typing on a Retina Macbook Pro﻿
Lmfao same shit here watching it on a 4K oled tv 😂﻿
I'm not quite understanding, so basically the farther away you use the device then the smaller the pixel density should be? And the smaller the pixel density then the better the display or is it vice versa? ﻿
+Emmanuel Doku yes the further away you use a device the less pixels you will notice so its more clear. the closer you are to a device the more mixels you will notice on the screen. so for example even though our tvs and monitors have less PPI than our smartphones thereason we dont notice the less pixels on tvs is because we are not as close to tvs like we are with phones﻿
The math doesn't work out. I have a 29 inch screen at 2560x1080(=2073600) pixels with dimesnions 26,5''x11,5''(=298,125), which by your math would give me a ppi of 6955,5ppi! Obviously wrong! Correct way to do it is to first square the pixel numbers in each direction and add the two numbers together. (2560^2 + 1080^2), then take the square root of that and divide it by the diagonal length of the screen; the one most frequently given by producer. [sqrt(2560^2 + 1080^2)]/29= 2778,5/29 = 95,8! That's more like it!﻿
are you retarded﻿
Omg! fetus Marques!﻿
+worstpersonever11 LOL yeah he looks like that﻿
QHD smartphones﻿
+Van Kai people say its not need but i think its going to be sick ﻿
+Van Kai Wow thats nice ﻿
I thought 1920 x 1080 = 2,073,600 ?﻿
+Brian Stephenson typo﻿
nice video bro﻿
another way to work out ppi square x and square y. add x^2 and y^2. square root the answer. then divide by diagonal screen size in inches﻿
I am happy with my 4 ppi. So there﻿
And again for for the subpixels, subpixels.﻿
42 squillion dots per pixel dividedby pie arse squared.﻿
outro song?﻿
Moscow (original) - Yves C﻿
funny im watching this on a retina mac﻿
And ironically came out the same year as the video lol﻿
+Jake Back watching on my 5k mac﻿
In researching process for 4k TV i appreciated this video. Already bought Vizio 50" for \$698! but not happy with it so I'm going to exchange for Samsung UN55HU6950. Anyways wanted to say i found it ironically funny that you said u didnt believe macbook with retina would be coming out, yet that is what i just watched this vid on. 2013 model, lol. Love all your videos Marques and appreciate what you do and also wanted to say it makes me smile to see a prediction like this. You're so good at everything you do, its nice to see your human once in a while. Thank you for sharing your passion with the world and thanks the inspiration. Hopefullly soon this year i can get my channel up and running.﻿
He probably likes to have them for his breakfast.﻿
Thanks!﻿
Woah man! Don't get ahead of yourself, a Retina Display on an iPad?! That is absurd! That sounds like something too futuristic to even imagine...I mean, retina display on anything is hard to imagine! haha﻿
i like cheerios too﻿
if we increase pixel per inch doesn't it increase resolution of display as pixels are increased ﻿
+Anurag Singh well usually you increase the resoulition to get higher pixels but also the smaller a device the more pixels﻿
I view these videos on my iPod 4, and a set the video quality to 360p. It's about 1 and a half hand widths from my face, and that's good enough for me. Of course, I would pick a higher resolution if it weren't for the fact that my Internet is terrible. Shaw has grandfathered our bandwidth twice, meaning that they have raised the minimum bandwidth for new plans above what we have twice already. ﻿
Well I have an iPad 3 and of course it has a retina display! :)﻿
Nice explanation﻿
Awesome video well explained the math helped big time ! ﻿
528 PPI? iPad? I thought is was 226?﻿
It's very neat to look at this video and just think of how much tech has evolved in the past coupes years. ﻿
His microwave is warning us of impending doom﻿
Precise, concise & easy.....typical marques!!....thaanx man!!!!﻿
Lol ironic watching this on a iPad mini retina (this is how I know this video is old)﻿
hey MKBHD, the current ipad has 264 PPI . and it is 2048X1536.... so there is something wrong with your calculation  ﻿
This video is 2 years old﻿
Thank you very much Marques for your video on Pixel Density - you explain really well and it helped me understand. But I don't think I understood the calculation for the ppi. For the full HD pixel display, I calculated thus: to get the total number of pixels on the screen display . . 1920 x 1080 = 2,073,600 total pixels. Then, to get the total size of the screen display - the area, I calculated . . 20.5" x 12.5" = 256 total square inches. Then, in order to work out the pixel density (ppi), I calculated: 2,073,600 divided by 256 = 8,100 ppi. But this doesn't seem right - it seems awfully high. What have I done wrong? Could you, or someone please kindly enlighten me. Thank you for your help. Chris﻿
The actual formula is this: √(X² + Y²) / diagonal display size in inches Using your specified example: √(1920² + 1080²) / √(20.5² + 12.5²) = 91.75 ppi Not sure about Marques formula in the video, but yeah...hope this helped!﻿
+Chenhao Liu Chenhao Liu, thank you for your kind help - yes, you really helped me! I tried your formula step by step to make sure I really understood the formula you sent me, and I came up with the same answer! Now I know how to calculate them. Have a nice day, Chris﻿
haha iphone sucks only 326ppi loool﻿
Thumbs up﻿
ummm if the ipad 3 has a 2048x1536 if has 263 ppi﻿
Awkward moment when I am watching on a late 2013 retina macbook pro...﻿
Is all u talk about is phones﻿
Lol yes﻿
Thank you!﻿
Somehow I keep on doing the calculations wrong. According to every reputable source my phone (HTC 8X) has a PPI of 342. When I calculate this [(resolution = 720x1280 = 921600) / (sq/inch ~ 4x2.25 = 9)] = 102400. A whomping 300 times more pixels than sources say. What am I doing wrong? How do I get the numbers that are on the tech-sheet? I came to this video to try and figure this out.﻿
i'm actually trying to solve this with little luck as well, but i can tell you that since you're dealing with area when measuring the display, the answer should be squared at the end. hopefully that will help﻿
sq root people﻿
lol , you did the math wrong ! iPad 3,4,Air have 264ppi not 528 , you have to divide by 2 here because of 2Xlength and 2Xbreadth . ﻿
Superb review. Now i know how to calculate the ppi of a device without using any software or anything. I will just need a calculator.﻿
+ashish mukundan hey man i tried your method and FUUUUUUUUUU﻿
+Nugroho anindra Got the answer? ﻿
seriously dude!!!! whats wrong with your Oven?????﻿
+lazertag720  thats hilararious lmfao﻿
Lol he didn't do anything it has something to do with the camera, you can see it happen with an old tv and a camera as well﻿
nicely explained﻿
higher ppi gets handy in durovis dive type solution. 4k or 8k would be awsome for example watching movies comparable to 200" sreen or more from couple of meters distance.﻿
That's a very good video! Thanks!﻿
"Ace Zeus" = Asus lol﻿
Wow, the PPI on the S2 shocked me! I agree, 250 PPI on a phone is the threshold for quality.﻿
This is what I think too. At least 250 or more is needed for a fine display.﻿
I presume Cheerios sponser you?﻿
thnx man!﻿
(+1) & Subscribed, I kinda knew all this already just loved watching you tell me I'm right,except I can convert it to pixels per sq. millimeter.﻿
Great video, simple yet informative! MKBHD is the boss, hope you continue doing this for a long time. ﻿
nice! my Laptop has 141 dpi(leonovo y 500), and my phone has 240 dpi(xperia u)! so thats really not bad at all!﻿
1080 x 1920 = 2,073,600 Pixels. On a 32" LED 1080p Screen, that measures 15.625" H x 27.625" W (10,963.656 Sq. mm).  2,073,600 Pixels (1080p) divided into 10,963.656 Sq./mm Equals 189.133 pixels per sq. mm. That's ppm if it exists.﻿
then why pc monitors has a clearer display than the ordinary phones?﻿
You are holding it farther away from your face, so it's harder to see the individual pixels.﻿
Another way to calculate it is (the data and numbers like the display diagonal size and resolution are the only things that change in this formula) √(1920² + 1080²) = 2203 and then you just divide the product by the diagonal size (in inches preferably), so this would be 441 ppi.﻿
Using a tablet typically THREE FEET away?! I don't think so.﻿
TQ﻿
WARNING:  mkbhd video descriptions are black holes. each video links to 5 other videos which in turn link to even more.   this is where i finally hit a dead end. phew :0 ﻿
this guy is the smartest black dude i've seen so far.... the black dudes around my block, usually are always saying..... "heyy Blooood, Where You at Niggaaaaa" "hahahaha Its Braizy My Nigga" "thats on pirul" and they where there pants all the way to there ass to prove they are "EASY ACCESS" ........DOPE REVIEW﻿
Dang my ipad 3 is awesome I cant see a single sub pixel This is a first﻿
You explain it so well﻿
4K likes! ^_^﻿
You've just said a lot of wrong things. The iPad 3/4/Air has a pixel density of 264 ppi, not 551ppi. It's quiet imponsible. And the iPhone 4/4s has a display of 960x640, not 960x540.﻿
thumbs up to you for pointing it out and to him for correcting. ﻿
Wait, what!? The iPad Retina's PPI is 264 not 528!!! Still looks pretty darn good, but I think you made a mistake right there, Marques.﻿
Ha 528ppi ﻿
Moto G, 329 PPI. iPod Touch 4g, 326 PPI. Not bad for me then :-)﻿
+juicy jared Vooc charging is really worth it. But the unified storage issue is not very pleasing if you want to flash roms.﻿
+juicy jared 45 mins to charge from 0 to 100﻿
@Marques: Your formula is wrong or not the standard. Check Wikipedia for Pixel density. The formula for PPI = sqrt(width^2 x height^2) / screen size. e.g. for iPad PPI = sqrt(2048^2 x 1536^2) / 9.7" = 264 PPI. Exactly as it is advertised.﻿
I'd like to see a TV with a "retina display" next. ﻿
so help full ﻿
yeah, for phones, anything having more than 300ppi is called as Retina Display. S-III is having around 308 ppi.﻿
The LG Spectrum has a display resolution of 720 x 1080 on a 4.5 inch IPS display giving it a pixel density of 326 PPI! PUT THAT IN YOUR JUICE BOX AND SUCK IT APPLE!!! ﻿
is it possible to have a 4k resolution on an iphone or android smartphone?﻿
ty for the correction. seems my source was asinine. ﻿
Thanks!﻿
I hate the retina display crap.. it's just another one of apple's crappy marketing schemes. They should just tell you the PPI....﻿
Eat ur cheerioos!!!!!!!!﻿
what is up with the microwave?﻿
Love how you used the cwm wallpaper.﻿
nexus 10 has 300 PPI!!!!!!!!!!!!!!﻿
1920 MULTIPLIED BY 1920 PLUS 1080 MULTIPLIED BY 1080 DIVIDED BY (INCHES) = PPI﻿
MKB is left handed.........﻿
sooo... theres NO point of a 4k tv﻿
nope. 1,920 × 1,200 so not true retina :/﻿
4:11, 521ppi rumored in beginning if 2012? lol we still don't have that! 441ppi is max currently by the Galaxy S4!﻿
And he also predicted the "rumored Samsung 11" tablet with a resolution of 2560x1600", which is the Nexus 10. (I know it came out after you wrote your comment)﻿
what about the note 2 it gots 237ppi or smting,so isnt that a big issue what do you say mate﻿
Tablets are normally used around 2 feet, smart phones around 1 foot. Monitors are usually about 2 to 3 feet away. You might want to discuss that the OS and the Apps have to be written to take advantage of these various screen sizes and resolution, otherwise the user won't see a difference. This is where Apple is MUCH better at supporting these resolutions from their OS perspective and their OWN apps, THEN the better developers begin to support it.﻿
your maths is a bit askew... 528 PPI on a 9/7" display? that would mean the IPad would have a resolution around 4,500x2500... Im pretty sure that's not what it is... ﻿
It was posted a year ago people. He made a mistake. Chill.﻿
Thanks man, great explanation! So how many PPI do you think are ideal for a 10" tablet and 7" tablet? ﻿
iShit﻿
mine has over 100﻿
When will you talk about Cheerios?﻿
LOL! ﻿
Ha Ha I walked up to my tv, and just I saw the dots. It's Hi def btw﻿
very informative!﻿
Still not an actual "retina" display. Just more Apple slick marketing.﻿
Hmm, I usually use Pythagorean Theorem to calculate pixel density since displays are measured on the diagonal typically. For example, a 24 inch HD display has a pixel density of sqrt(1920^2 + 1080^2)/24 = 92 ppi. Makes more sense to me than finding the length and width of the display since all you need is the resolution and diagonal length.﻿
liar!﻿
did u say 528 ppi for the ipad 3??? how a 9.7 inch display gives you 528 ppi??? ﻿