Idaho Transportation Department

Enter Axle Spacing in Decimal Format
(Example: 15 feet 9 inches should be entered as 15.75)


Distance A:
Distance B:
Distance C1:
Distance D:
Distance E:
Distance C2:
Distance F:
Your Off-Track is:

Note: Click on "Calculate" or press TAB after entering last number.

Inch to Decimal Conversion

1" = .08 ft

2" = .17 ft

3" = .25 ft

4" = .33 ft

5" = .42 ft

6" = .50 ft

7" = .58 ft

8" = .67 ft

9" = .75 ft

10" = .83 ft

11" = .92 ft