So What Can I see From Here?
Usually, the limit to how far characters can see will be some obstruction, such as a building, a forest, or some hills. Mist and darkness also limit vision. Sometimes, however, the characters will be on flat plains on a clear day and the only limit to their vision will be their perception and the horizon. Once something goes below the horizon, it can’t be seen. But where is the horizon?
| Height in feet |
Miles away |
| 3 |
2 |
| 6 |
3 |
| 10 |
4 |
| 20 |
5 |
| 30 |
6 |
| 40 |
7 |
| 50 |
8 |
| 60 |
9 |
| 70 |
10 |
| 80 |
11 |
| 90 |
12 |
| 100 |
13 |
| 300 |
20 |
| 500 |
25 |
| 1,000 |
40 |
| 5,000 |
80 |
| 10,000 |
100 |
| 30,000 |
200 |
| 100,000 |
400 |
| 500,000 |
800 |
This table has been simplified for gaming use. On an earth-sized planet, the horizon for a six-foot tall person standing at sea level or on flat plains will be about 3 miles. This means that they can see features that are at ground level for up to three miles (depending, of course, on the quality of their vision and the size of the object). Features that are higher than ground level can be seen further.
To determine how far away you can see something, just add together all of the heights. For example, if a 6 foot man is on a 4 foot horse standing on a 30 foot hill, how close would you have to be to a 60 foot tall tower to see it? First add all the heights together 6 + 4 + 30 + 60 = 100 feet. Look at the table under “height in feet” and find 100 feet. Then look across under “miles away” to find 13 miles. So the tower could be spotted if it was no farther away than 13 miles.
You could see a 14,000 foot mountain a little more than 100 miles away.
This is good for seeing features on a map, such as lakes, forests, mountains, towns, etc. but knowing how far you can see is often not what your Player Characters need to know. Just because you can see 3 miles doesn’t mean that you can see a monster on the horizon. For that we need another table.
|
Perception Distance Table
|
| Item |
Size |
Perceive |
Identify |
| Creature – Fine |
6” or less |
30 ft. or less |
5 ft. or less |
| Creature – Diminutive |
6” – 1 ft. |
30 ft. – 60 ft. |
5 ft. – 10 ft. |
| Creature – Tiny |
1 ft. – 2 ft. |
60 ft. – 120 ft. |
10 ft. – 25 ft. |
| Creature – Small |
2 ft. – 4 ft. |
120 ft. – 240 ft. |
25 ft. – 50ft. |
| Creature – Medium |
4 ft. – 8 ft. |
240 ft. – 480 ft. |
50 ft. – 100 ft. |
| Creature – Large |
8 ft. – 16 ft. |
480 ft. – 960 ft. |
100 ft. – 200 ft. |
| Creature – Huge |
16 ft. – 32 ft. |
960 ft. – 1,920 ft. |
200 ft. – 400 ft. |
| Creature – Gargantuan |
32 ft. – 64 ft. |
1,920 ft. – 3,840 ft. |
400 ft. – 800 ft. |
| Creature – Colossal |
64 ft. or more |
3,840 ft. or more |
800 ft. or more |
In this table “perceive” means that you can see it and may notice it with a perception check. If you do notice it you will recognize the creature type if you have seen one before. If you don’t know what type of creature it is you will be able to tell the creature’s coloration, size, shape, number of limbs, wings, etc. If the creature is moving, you will also be able to tell which direction it is traveling and about how fast.
“Identify” means that you can see details and may recognize an individual that you have met before.
Here is a simple rule of thumb that is accurate enough for gaming use:
Distance away (in feet) that you can perceive an item is its size (in feet) times 60.
Distance away (in feet) that you can identify an item is its size (in feet) times 12.
Round fractions down to the nearest 5 ft.
The item’s size is its longest dimension (height or width).
One more thing.
You can perceive a burning candle 1 1/2 mile away.
Dungeon Master Assistance 
Great article!
I assume seeing a lit candle at 1.5 miles is in the dark?
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Yes. In the dark, clear sky, line of sight, etc. for creatures with typical human vision.
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Reblogged this on Fantasy of the mind.
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Hello.
I would like to translate this and another interesting articles from you to spanish at my blog so people from Spain and cener-south America can reach them too. Can I? Of course, menctioning you as original author.
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Hello David,
Yes, you have my permission to translate this and any other of my posts into Spanish and put them on your blog. Thank you for asking for permission. I only wish that I had the language skills required to do that myself.
Providing a link to my original post each time will be greatly appreciated.
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Thank you very much, Ronny
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Calculation is not right, or is it?
By your logic of adding up (4+6+30+60=100) that would mean that two persons of about 6 ft height would see eachother at (6+6=12) a bit over 4 miles apart? I think each can see up to 3 miles and the horizon takes over, so actually not being able to see for a mile more in case there’s a person standing? Or am I wrong?
I’d take higher of those two in your case, so a person on a horse on a hill (40) would see a 60 ft tower if it was no further than 9 miles.. and it would be barely visible at that/max distance (perc roll hard DC20) due to spotting something so far on the horizon.. not distinguishable, just seeing “something” 🙂
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I basically agree with you.
Did you miss the part where I said “This is good for seeing features on a map, such as lakes, forests, mountains, towns, etc.”? You couldn’t see a person 4 miles away, he would be too small. Check out the “Perception Distance Table”. You couldn’t even se a “Colossal” creature one mile away!
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Yup, my bad 🙂
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No problem. 🙂
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On the contrary, though, the reasoning for adding the heights is just fine. Although the person on the horse on a hill couldn’t see the base of the tower at 13 miles, as it would be below the horizon, he should just barely be able to see the top above it – assuming it is wide enough to distinguish at the distance.
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I wander if we can put a DC check about the distance.
Ex : human size =
240 Ft = DC10
480 Ft = DC15
720 Ft Dc 20
and so on
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I was young and too much of a rules guy, you should just go with the flow. Game has to be fluid, not to hassle yourself and players with trivial things such as being 100% realistic 🙂 you have to enjoy and just decide on spot, keeping in mind DC rules:
5 — very easy
10 — easy
15 — medium
20 — hard
25 — very hard
30 — impossible
Nat 20 is also valid only for attacks, crit, not for ability checks and such 🙂
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You’re right, it’s just to have in mind, a rule of thumb, a little bit of realism , and obviously not to complicate the game 😉
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by the way..thanks for yours explanations 🙂
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you’re welcome 😉
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