The Spread is this times the Advance

To Find the degree of the fitting to use on an offset

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Degree	Multiplier
5⅝°	The Spread is .0985 times the Advance.
11¼°	The Spread is .1989 times the Advance.
22½°	The Spread is .4142 times the Advance.
30°	The Spread is .5774 times the Advance.
45°	The Spread is equal to the Advance.
60°	The Spread is 1.7321 times the Advance.
67½°	The Spread is 2.4142 times the Advance.
72°	The Spread is 3.078 times the Advance.