How many pieces of track do you need to make a circle?

 
The following charts give the information on the most popular types of track avalible for 'O', 'HO', and 'N' scale.
 
HO Scale 
Radius Curve No. of Pieces

HO Code 100 & 83

15" Radius Section 12
18" Radius Section 12
22" Radius Section 16
24" Radius Section 16
 
N Scale
Radius Curve No. of Pieces

N Code 55

10" Radius Curve 16
11.25" Radius Curve 16
12.5" Radius Curve 16
13.75" Radius Curve 16
15" Radius Curve 16
16.25" Radius Curve 16
17.5" Radius Curve 16
18.75" Radius Curve 16
20" Radius Curve 16
21.25" Radius Curve 16
30.609" Radius Curve 32
71" Radius Curve 44 + 4.25" straight

N Code 80

9 3/4" Radius Curve 12
11" Radius Curve 12
19" Radius Curve 24
 
O Scale
Diameter ( inches) No. of Pieces

Realtrax & Scaletrax

O-31 8
O-42 12
O-54 12
O-72 16
O-82 16

Lionel Fastrack

O-36 8
O-48 12
O-60 16
O-72 16
O-84 32

Atlas O 21st Century Track System

O-27 8
O-36 12
O-45 12
O-54 16
O-63 16
O-72 16
O-81 16
O-90 16
O-99 16

Lionel O Tubular Track System

O-31 8
O-42 12
O-54 16
O-72 16

Lionel O-27 Tubular Track System

O-27 8
O-42 12
O-54 16
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