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Map Scale Conversion Factors

Scale Representative Fraction Map in/mi Map in/ch map ft/in
1:253,440 253.44 0.25 0.0031 21,120
1:126,720 126.72 0.50 0.0063 10,560
1:63,360 63.36 1.00 0.0125 5,280
1:62,500 62.50 1.01 0.0127 5,208
1:31,680 31.68 2 0.025 2,640
1:24,000 24.00 2.64 0.033 2,000
1:21,120 21.12 3 0.038 1,760
1:15,840 15.84 4 0.05 1,320
1:7,920 7.92 8 0.1 660

Table 5.1. Map Scale Conversion Factors