I did some anolysis regarding the map size https://imgur.com/l3fS5G4 For those too lazy to click that link, I came to the conclusion that the Fallout 4 map size is 9 square miles.

How did I arrive at that conclusion? I was looking at data I retrieved using the Companion App API. Fallout sends some 'calibration' coordinates (the edges of the red squared area in the image above) to the app, so that the app knows where to show the map markers on the global map. The coordinates the game sends are NW (-135168, 102400), NE (114688, 102400) and SW (-135168, -147456). With each local map snapshot the game sends to the app, it again sends some 'calibration' coordinates which can be used to determine where in the global world the local snapshot is placed. Example coordinates are NW (-42959.922, 59482.934), NE (-39089.203, 59482.934) and SW (-42959.922, 57305.652). They change all the time as you move around, but the width and height always stay the same. Comparing the width and height of global map and local snapshot we can learn that a local snapshot fits 64.55 x 114.756 times into the global map.

Next I needed some feature from the local map whose size I could estimate. I choose to use one of the big wood prefab tiles from the settlement workshop. Measuring the size on the local map revealed that you can fit such a tile 15.234 x 8.571 times into the local map. After some more calculations we know that a prefab tile fits 983.355 x 983.573 (there seem to be some minor measurement errors here as I suppose those two numbers should exactly be the same) times into the global map.

Assuming that the size of a prefab tile is 3x3 meters I arrive at the conclusion that the Fallout 4 map size is about 3000 x 3000 meters, or 9 square kilometers.

Are you sure your calculations are correct? According to http://whatculture.com/gaming/fallout-4s-map-is-bigger-than-skyrim-but-still-less-than-the-witcher-3.php

Fallout 3 – 16 mi²

Skyrim – 39mi²

Fallout 4 – 43mi²

And they even put the map sizes against each other here: https://www.reddit.com/r/fo4/comments/3rir58/fo4_fo3_skyrim_map_size_comparison_scaled_to_grid/

Top marks for showing your working out.

Sorry, but that side is full of [censored]. They do not tell how they arrived at their conclusion and how they ensured that they got the scale of the maps they are comparing.
Also 43mi² is a bit unrealistic. I played the game and I can tell you that Fallout 4 is never that big, you reach the other end of the map too early when you start from the opposite side.

I, however, gave all information I used in my anolysis, so everyone can redo my anolysis and confirm it (or prove me wrong).

It does feel rather small, yeah. I keep forgetting that I'm supposed to be wandering throughout Boston and surrounding towns: feels more like one downtown city with attached suburbs. People may damn New Vegas as being too "empty", but at least it felt like a desert and still kept things in reasonable walking distance.

It's quite big.

*childish giggle*

The "real world unit" size may be wrong, but by counting the cells the comparison sizes should be correct.

As to your anolysis: 9 km² doesn't really surprise me for a "real world" size equivalent, given how much more complicated Fallout's urban maps would be to make than TES' wilderness. That's still a lot of virtual real-estate.

Gamers and their open-world map sizes. Still, this doesn't anywhere near beat the obsessiveness over at GTAforums when GTA V's map leaked. Or GTA IV's map leaked. Or San Andreas' map leaked.

All calculations using any unit sizes or convertion tables are unneeded and arbitrary.
First: size=\= quality.

Second:
The only calculation that matters in game size is time it takes to walk north to south and east to west.

Average walking speed is 3.1 mph/5kph

If a map takes 1 hour to walk across its around 3 miles wide.

If my character walks 6 mph and takes 1 hour to walk across it is still 3 miles wide because everything in games are relitive to how quickly my character moves.

Over 220 hours played, still have about 20% of the map completely unexplored, it's "Big Enough".

Forgot to check the second link. Yeah, the maps comparison seems to be legit.

Sure, when playing a game the only thing that matters is the subjective size. But I wanted to have some objective numbers to refute that inflated numbers a lot of so-called 'gaming sites', like the one corebit mentioned above, love to talk about.

I also think that Fallout 4's map is big enough. It is much more vertical that any previous game, adding a lot of 'play space' that way

Can you use your anolysis to explain why my character can carry 350 pounds of gear while wearing nothing but panties and a bra?

Over 300 here, and same except I'd say ~50% of the map unexplored. "Size" in a Cartesian sense doesn't matter.

the guy who ran across the fallout 4 map was sprinting much of the way and fallout 4 sprinting speed is very fast and at that speed you can easily cross a lot of maps that fast, your calculations are wrong, the map isn't small, fallout 3 is significantly smaller, less than half, fallout 4 is 427 grid squares and fallout 3 is 289 grid squares, also the witcher map when compared to fallout 4 isn't much bigger and has about the same size area of water, you can run across all these maps pretty fast at fallout 4 sprinting speed.

Man walks at less than 4mph, 4mph is a fast walk, slight jog. How long will it take you to run end to end? I doubt it would take 10-11 real hours to walk across the map. Our guy may be super sprinter but then what is size and distance, but i suppose you could say he runs unnaturally fast like Barbie being out of proportion (and He-Man).

Yup, and when I say 20% unexplored, that is just map area, if we include unique buildings, locations and indoors.... whooo boy, I ain't seen nothing yet.

Any stats on Daggerfall size? That was supposed to be the largest map size in the TES franchise. Would be interesting to see how that legacy game CGA/VGA resolution map size holds up against that of today's super 23"+ monitors

i found 90% of the places 2 time over in less then 20 hours. so it does feel pretty small about 1/3 of skyrim.

that was wrong, the author even apologized

Except they are all... samey. Seen one hospital, seen em all. Industrial buildings, hotels, residentials... a couple of nice setpieces, but not much outside that. Could argue "well Skyrim had nothing but draugr crypts and dwemer ruins", but those had the advantage of having so much variation even among those templates. No two ruins were exactly alike, with so many having unique puzzles and approaches that even made radiant quests more exciting there than here.

The are not "samey" from a tactical standpoint, though I agree they are pretty samey from a "texture" standpoint. It is a post-apocalyptic wasteland after all.

And where exactly am I wrong? I triple checked all my calculations, they are correct. I love people who just reject other people's findings just because they don't like it, without actually trying to disprove what the other person did.

I would look into the numbers highlighted.

I have no idea how big it is but damn it feels massive to me. Sure, if all you do is run one place to the other it probably seems small. But exploring it inch by inch.. going to every single area marked on the game guide maps. This game is just ungodly massive.

I just got through doing the Financial District... it's like a massive maze with most the areas all linked to one another. I got so fricken confused and turned around in there. Took me around 6 hours to do just that district. By good fortune that's how long it took me to get MacCready's side quests all completed as well... Simply took him exploring with me into the financial district and the first part of his quest popped up rather quickly. Ran off to do that since I'd already been to that zone.. Went back to the financial district, finished it up. Ran all the way back to Sanctuary to drop off me loot and MacCready blabbed about the other part of the quest. Nice..worked out well.

Sorry but that size is wrong. It's less than 4 square miles.

Here is my math

128 game units(GU) = 6ft (height of player character)
Each cell in Oblivion,Fallout 3, Skyrim and Fallout 4 is 4096x GU
128GU /6 ft= 21.3~GU
1ft=21.3~ GU
4096/21.3=192.3004694835681 ft
192.3004694835681 ft x sqr'd =36979.47056360071 sq ft per cell
1 sq mile = 27878400 sq ft
27878400 sq f/36979.47056360071sq ft=753.8885650634763 cells make one square mile

FO4's Commonwealth world space has approximately 3008 playable cells.(each grid square on the map is exactly 4 cells and they total 752 but not all of them can be accessed. some in the glowing sea while shown on the map can't be accessed. that means this estimate is over)

3008/753.8885650634763 = 3.9899~ Sq miles

Fallout 4 main world space is less than 4 sq miles.

OB's Tamriel world space contains 4600-4800 playable cells
4800 cells/753.8885650634763 cells(1 sq mile)=6.36~ sq miles
Oblivion main world space has less than 6.4 sq miles playable area.

FO3's Wasteland worlds pace has 2500 playable cells at the same size:
2500 cells/753.8885650634763 cells(1 sq mile)=3.31~ sq miles
Fallout 3 main world space has just over 3.3 sq miles of playable area.

SK's Tamriel world space contains 4326 playable cells.
4326/753.8885650634763(1 sq mile)=5.73~ sq miles
Skyrim main world space has just over 5.7 sq miles of playable area.