Kudos again to the folks at diablo.incgamers.com for this information. The results below are measured using in-game "yards". See this article for the details on how they did the measuring and an idea of what these distances look like on screen. Note that these are based on beta, so if people see things that have changed (like Dire Bats being fixed), please update the values.
Maximum Distance/Range for Skills
A range of values is listed for a
few skills due to them being random. Also, distances for skills that
don’t touch the ground (& go past the left/right edge of the screen)
have their perspective affected by their casting elevation. I’m not
sure how to adjust the perceived distance to compensate, so their
actual range will be less than the observed distance listed. The
skills that are affected are marked with an “*”. Also, some skills
were harder than others to judge so there’s no guarantee it’s error
free.
Barbarian
8 – Cleave (12 area effect)
10 – Bash
10 – Frenzy
11 – Revenge
12 – Rend
16 – Hammer of the Ancients (6 radius centered 10 yards in front
of the barb)
50 – Seismic Slam (possibly random)
50 – Leap
70* – Ancient Spear
Demon Hunter
80* – Chakram (with a 3 radius)
80-90* – Rapid Fire (average due to being random)
85* – Bola Shot
86* – Impale
90* – Entangling Shot
100* – plain arrow
120-130* – Hungering Arrow (kind of> guessed here since it goes off screen)
Monk
9 – Fists of Thunder (no rune, first 2 hits): third hit is 14
yards
10 – Crippling Wave
10 – Lashing Tail Kick
16 – Deadly Reach
27 – Wave of Light (initial area effect has radius of 16 centered 11
yards out from the monk)
28 – Fists of Thunder (with Thunderclap rune,teleport range); only 14 if not targeting
50 – Dashing Strike (only when cursor is close to a target, otherwise 10)
Witch Doctor
30-50 – Plague of Toads (average due to being random)
30 – Firebats (no rune)
50 – Corpse Spiders (with random radius somewhere around 15 max)
60 – Grasp of the Dead (with 14 radius)
70* – Firebats (Direbats rune) : not the listed 40 (It’s been posted on the official
bug forum already.)
78* – Haunt (but when cursor is close to a target, it reaches all the way to the top corners)
100* – Poison Dart
Wizard
14 – Spectral Blades (only 10 if not targeting)
20 – Frost Nova
20-30 – Shock Pulse (average due to being random)
26 – Wave of Force
50 – Arcane Torrent (with random radius about 8 yards, radius of 4
individually)
50 – Energy Twister (average due to being random) (with 8-10 radius)
55 – Ray of Frost
86* – Magic Missile
88* – plain wand missile
94* – Arcane Orb