A rounded rectangle but with full radius.

This cannot be a rounded rectangle because those are not fully or "perfectly" rounded at the two ends. This is more like an elongated circle? A flat cylinder?

I searched a lot, but among all guides or pictures that identify and name different shapes, I couldn't get this particular shape. The closest I could get was a stretched ellipse.

There are only two processes to get this shape as far as I know: the first one is making a long rectangle and making its corner radius exactly half of the height. The second one is putting two circles a distance apart and adding a rectangle between those. So, are these something like "perfect rounded rectangles" or "rectangular circles"?

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    I would call it "rounded stroke cap" – Vinny Nov 12 at 16:03
  • Yes, that seems like a good name. This is a stroke cap after all, while the stroke has rounded corners. But we specifically make this shape too, in general designs, using rounded rectangles and not strokes. This shape might be an important, big, and bold part of the layout. Calling it just a stroke cap won't be enough. – Abhimanyu Nov 12 at 16:07
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    I see... In this case, I guess "Stadium shape" as suggested by @Danielillo might be more suitable. – Vinny Nov 12 at 16:16
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    This was asked a long time ago on math.stackexchange math.stackexchange.com/q/539262/29335 – rschwieb Nov 13 at 4:25
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    Ah, someone even pointed out a second math.se version below I was previously unaware of: math.stackexchange.com/q/5465/29335 – rschwieb Nov 14 at 14:29
up vote 23 down vote accepted

Stadium Shape

As a geometric figure.

A stadium is a geometric figure consisting of a rectangle with top and bottom lengths a whose ends are capped off with semicircles of radius r.

enter image description here

Sources mathworld.wolfram.com/Stadium.html / mentalfloss.com


Capsule Shape

Following @Rafael's answer, there are many results in Google as Capsule Shape

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    In the US I'm sure a lot of ppl think of a Baseball stadium. – Rafael Nov 12 at 16:25
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    Perhaps because of my primarily 3D design area of knowledge, I refer to this form and shape as a capsule - though that is most often applied to the 3D solid of similar form, it's also often used for the 2D silhouette of that same form. en.wikipedia.org/wiki/Capsule_(geometry) – GerardFalla Nov 13 at 21:36
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    I've seen it called a "racetrack" as well, same basic idea. – whatsisname Nov 14 at 5:48

While perhaps not the "technical" term for it.. I see it often called a Pill Shape.

For me, it is a rounded rectangle just because the tool I would use is a rectangle and I would round it.

On a 3D model, I would use a sphere and move some vertexes.

But for non-graphic designers, I would call it a "Pill shape" Probably Penicillin pill shape.

Obround is another alternative. See this question on math.stackexchange or the wiktionary definition.

Two out of Wikipedia's five stadium references use obround instead.

A technical word for this kind of shape is Oblong.

See : https://www.vocabulary.com/dictionary/oblong

  • By definition, an oblong is more general term, not describing shape of the corners. It might work in some communities but be confusing in general use. – miroxlav Nov 13 at 15:41
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    @miroxlav the definition changes between UK and US English. – Pete Kirkham Nov 13 at 17:26
  • Quote: "If you stretch a circle until it becomes an oval" you get an oval, an ellipse. – Rafael Nov 13 at 18:32
  • @PeteKirkham – it does, but which one exactly describes the above shape? I think neither. – miroxlav Nov 13 at 20:40
  • Agree that oblong has very large meaning but it could be a word for this kind of shape. Also there is no specific word for every trapezoid maybe there is none for an elongated shape without perfectly rounded corner. – David Horizonef Nov 14 at 8:21

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