Expert: Dr Darts Date: 4/28/2008 Subject: Dart boards
Question How do i make a dartboard?
How can i calculate the percentages and areas of dartboard?
I have to have a 15% chance of hitting bullseye and 30% chance of hitting another region.
How do i calculate the percentages and areas to be exact?
Answer I need clarification. Do you want dimensions of a standard dart board?
The radius of a standard dartboard from the outside double wire to the bull is 170mm.
Assuming your darts all score ie go inside the outer double wire, and excluding skill, then your bull would have to comprise 15% of the dartboard area.
The area of the board is 90774 sq mm
15% of this is 13616 sq mm giving a diameter for the bull to be 130mm compared to 12.7 mm on a normal board. The diameter of the 25 is 31.8 mm.
Your board will have a significantly larger bull.
If you have a 15% chance of hitting the bull you automatically have an 85% chance of hitting another region. If you wanted a 30% chance of hitting a specific other segment, the nearest you could get would be to divide the board into tyhirds with a bull in the centre.
This give 4 segments only . You would have a 15% chance of hitting the bull and a 28.3333 % chance of hitting another named segment.
Since I cannot assume that this board is for serious play I would make it out of cardboard boxes.
I have attached the official rules ref dartboard dimensions below
13.00 DARTBOARDS
13.01 All dartboards used in BDO tournaments shall;
(a) be of the 'bristle' type.
(b) be of the '1 - 20' clock pattern.
(c) have an inner centre ring, 'Bull', that shall score '50' points.
(d) have an outer centre ring that shall score '25' points.
(e) have an inner narrow band, 'Treble Ring', which shall score
treble the segment number.
(f) have an outer narrow band, 'Double Ring', which shall score double
the segment number.
(g) have segmental material comprising;
Wire types can be round, triangular or diamond-shaped in section
- maximum 1.85mm or 1.27mm minimum. (+/-.2mm)
- Inner and outer bull rings, if not made of wire, to have a wall thickness not greater
than 1.6mm {+/- 0.2 mm} and to have sharpened edges.
- Strip materials should not be greater than 1.85 mm in wall thickness and have a
sharpened edge to form an apex.
- All segmental materials shall either be affixed to the face of the board in such a manner
that they lie flat on the face of the dartboard or alternatively strip materials be embedded
into the surface of the board.
(h) have the following dimensions;
Double and Treble dimensions to be;
- for conventional wire boards, measured inside to inside = 8.0mm +/- 0.2mm
- for boards manufactured with strip material measured apex to apex = 9.6mm +/- 0.2mm
'Bull' inside diameter = 12.7 mm. +/- 0.2 mm.
’25’ ring inside diameter = 31.8mm +/- 0.3 mm
Outside edge of ‘Double’ wire to Centre Bull = 170.0 mm. +/- 0.2 mm.
Outside edge of ‘Treble’ wire to Centre Bull = 107.0 mm. +/- 0.2 mm.
Outside edge of ‘Double’ wire to outside edge = 340.0 mm. +/- 0.5 mm.
Of ‘Double’ wire
Overall dartboard diameter {+/- 3.0 mm.} = 451.0 mm. +/- 3.0 mm.
(i) All dartboards to be manufactured from African Sisal
13.02 The dartboard shall be fixed such that the '20' segment is the darker of the two segment
colours and is at the top centre of the dartboard.
13.03 The dartboard shall be fixed in such a manner that the vertical height from the floor, at
the same level as the Oche, to a horizontal line through the centre of the 'Bull' shall
measure 1.73 metres.
