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Table 2- Improved "Rule-of-Thumb" : Conversion Factor (M)

Stave Thickness
Ratio (K)
(M)
6 sides
(M)
8 sides
(M)
9 sides
(M)
10 sides
(M)
12 sides
0.100 - 2.444 2.771 3.097 3.745
0.125 1.795 2.451 2.777 3.102 3.749
0.150 1.807 2.458 2.783 3.106 3.752
0.175 1.820 2.465 2.788 3.111 3.755
0.200 1.832 2.473 2.794 3.116 3.759
0.225 1.845 2.480 2.800 3.121 3.762
0.250 1.857 2.487 2.806 3.125 3.766
0.275 1.870 2.495 2.812 3.130 3.769
0.300 1.882 2.502 2.818 3.135 3.772
0.325 1.895 2.509 2.824 3.140 3.776
0.350 1.907 2.517 2.829 3.145 3.779
0.375 1.920 2.524 2.835 3.149 3.782
0.400 1.932 2.531 2.841 3.154 3.786
0.425 1.945 2.539 2.847 3.159 3.789
0.450 1.957 2.546 2.853 3.164 3.792
0.475 1.970 2.553 2.859 3.168 3.796
0.500 1.982 2.561 2.864 3.173 3.799
0.525 1.995 2.568 2.870 3.178 3.802
0.550 2.007 2.575 2.876 3.183 3.806
0.575 2.020 2.583 2.882 3.187 3.809
0.600 2.032 2.590 2.888 3.192 3.812
0.625 2.045 2.597 2.894 3.197 3.816
0.650 2.057 2.605 2.900 3.202 3.819
0.675 2.070 2.612 2.905 3.207 3.822
0.700 2.082 2.619 2.911 3.211 3.826
0.725 2.095 2.627 2.917 3.216 3.829
0.750 2.107 2.634 2.923 3.221 3.833
0.775 2.120 2.641 2.929 3.226 3.836
0.800 2.132 2.649 2.935 3.230 3.839
0.825 2.145 2.656 2.940 3.235 3.843
0.850 2.157 2.663 2.946 3.240 3.846
0.875 2.170 2.670 2.952 3.245 3.849
0.900 2.182 2.678 2.958 3.250 3.853
0.925 2.195 2.685 2.964 3.254 3.856
0.950 2.207 2.692 2.970 3.259 3.859
0.975 2.220 2.700 2.976 3.264 3.863
1.000 2.232 2.707 2.981 3.269 3.866
1.025 2.245 2.714 2.987 3.273 3.869
1.050 2.257 2.722 2.993 3.278 3.873
1.075 2.270 2.729 2.999 3.283 3.876
1.100 2.282 2.736 3.005 3.288 3.879
1.125 2.295 2.744 3.011 3.293 3.883
1.150 2.307 2.751 3.017 3.297 3.886
1.175 - 2.758 3.022 3.302 3.889
1.200 - 2.766 3.028 3.307 3.893
1.225 - 2.773 3.034 3.312 3.896
1.250 - 2.780 3.040 3.316 3.900
1.275 - 2.788 3.046 3.321 3.903
1.300 - 2.795 3.052 3.326 3.906
1.325 - 2.802 3.057 3.331 3.910
1.350 - 2.810 3.063 3.336 3.913
1.375 - 2.817 3.069 3.340 3.916
1.400 - 2.824 3.075 3.345 3.920
1.425 - - 3.081 3.350 3.923
1.450 - - 3.087 3.355 3.926
1.475 - - 3.093 3.359 3.930
1.500 - - 3.098 3.364 3.933