nope terrible at math just want to know how long a chain was should have been more specificgypsyheart said:Does this help?
Maps from some countries may use imperial units, especially older maps. These maps displayed scale ratios but often they were of the form 60 chains to 1 inch or 2 miles to 1 inch, etc.
In this case measure mm on the map and multiply by the scale factor below (where 1 yard = 36 inches, 1 chain = 22 yards) ...
40 chains = 1 inch >> 40 x 22 x 36 >> 1 : 31,680 (scale factor)
60 chains = 1 inch >> 60 x 22 x 36 >> 1 : 47,520 (scale factor)
1 mile = 1 inch >> 63,360 x 1 >> 1 : 63,360 (scale factor)
2 miles = 1 inch >> 63,360 x 2 >> 1 : 126,720 (scale factor)
4 miles = 1 inch >> 63,360 x 4 >> 1 : 253,440 (scale factor)
Calculation: Measure 132 mm on a map which is scale 60 chains to 1 inch
132 x 47,520 = 6272,640 milimetres
ie 6,272.6 metres
ie 6.27 kilometres