“5 foot-radius sphere centered on a point within range” which one is correct? #dnd @ChrisPerkinsDnD @mikemearls pic.twitter.com/qe6JxXQlc2

— JB Little (@DropTheDie) February 27, 2016

The circle on the left has a 5-foot radius. The circle on the right does not. https://t.co/uegJ8E2LOg

— Christopher Perkins (@ChrisPerkinsDnD) February 27, 2016

@DM_Screen @DropTheDie @DnDDomain @ChrisPerkinsDnD I’d use the red one – blue one is pushing radius a bit further out to snap to grid

— Mike Mearls (@mikemearls) February 28, 2016

@mikemearls @DnDDomain @ChrisPerkinsDnD Thanks for the insight, Mike. Most people seem to agree. These will help: pic.twitter.com/brH6BYXclk

— JB Little (@DropTheDie) February 28, 2016

@DropTheDie @xenon_ST @ChrisPerkinsDnD yup – that’s the intent

— Mike Mearls (@mikemearls) February 28, 2016

@ChrisPerkinsDnD @DropTheDie @JeremyECrawford The question then becomes how much of a 5ft grid square has to be covered for it be affected?

— Mavalanche (@aus_maverick) February 27, 2016

If an area of effect is circular and covers at least half a square, it affects the square (see DMG, 251). #DnD https://t.co/Qilytnphqk

— Jeremy Crawford (@JeremyECrawford) March 1, 2016

Maybe there’s something I’m missing and I’ll sound silly for asking this but… I’ve played plenty of RP games (D&D etc.) and I’ve never seen movement, character placement, or any form of targeting actually use line intersections instead of the center of a square/hex. I’m sure “mathematically” the left (red) circle is distance accurate, that being said, the right (blue) circle is showing accurate target placement for the game. it’s obvious this question comes about from a player or DM wanting to know “just how squares does this 5 or 10 or 15 ft radius affect?” I’ve been looking for references on this for a game I’m in where these kind of arguments seem to happen quite often and I’m not finding any images that give a clear and correct answer.

For example, could you please illustrate the area of effect for “Earth Tremor” (D&D 5e, lvl 1 evocation, range: self, 10 ft radius)? And please don’t draw it with the origin on a line intersection because that’s not where the character is standing.