Monkey Fist Passes

This assumes you are using 550 cord, and all measurements are in inches. I know, they're incredibly inefficient and silly units of measurement, but that's what the source document was in. The designs with whole-number pass calculations are bolded (they're every 3/8").

Core diameter	Decimal	Passes	Circumference	Cord Used
1/8	0.125	0.67	0.393	0.785
1/4	0.25	1.33	0.785	3.142
3/8	0.375	2.00	1.178	7.069
1/2	0.5	2.67	1.571	12.566
5/8	0.625	3.33	1.963	19.635
3/4	0.75	4.00	2.356	28.274
7/8	0.875	4.67	2.749	38.485
1	1	5.33	3.142	50.265
1 1/8	1.125	6.00	3.534	63.617
1 1/4	1.25	6.67	3.927	78.540
1 3/8	1.375	7.33	4.320	95.033
1 1/2	1.5	8.00	4.712	113.097
Ping pong ball	1.55	8.27	4.869	120.753
1 5/8	1.625	8.67	5.105	132.732
Golf ball	1.68	8.96	5.278	141.869
1 3/4	1.75	9.33	5.498	153.938
1 7/8	1.875	10.00	5.890	176.715
2	2	10.67	6.283	201.062
2 1/8	2.125	11.33	6.676	226.980
2 1/4	2.25	12.00	7.069	254.469
2 3/8	2.375	12.67	7.461	283.529
2 1/2	2.5	13.33	7.854	314.159
2 5/8	2.625	14.00	8.247	346.361
Tennis ball	2.63	14.03	8.262	347.681
2 3/4	2.75	14.67	8.639	380.133
2 7/8	2.875	15.33	9.032	415.476
3	3	16.00	9.425	452.389

Thanks to William Welch for the formula, and Cooter Malone for doing the math.