HOWTO - Convert Decimal Feet to Feet and Fractional Inches

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Unit conversion foot survey convert units...

See also Topography and Project Units

0.01' = 0.003048 m

1/8" = 0.0104167'

1 mm = 0.03937" ~ 5/128" (4/128" = 1/32")

NOTE: Metric surveys usually show 3 decimals (1 mm), so they're 3x the precision of Imperial surveys (1/8"), but FFE is only shown to 2? (10 mm / 0.03'; ~1/3 the precision), see #4074.11 ADR.

DO NOT convert differences in elevations, instead convert elevations separately, then subtract to find the difference (or you may get different results depending on how the various values are rounded). For example: two buildings at FFE 281.7' and 281.58' would be 0.12' apart (1 7/16"), but they should be converted first (to 281' 8 3/8" & 281' 7") then subtracted to find the difference (which is 1 3/8" NOT 1 7/16") [example from #5462.10 AMR-CDC 5/4/21].

Rounded to the nearest 1/8" with four exceptions (to nearest 1/16"):

Decimal Feet to Inches
0.00' 0"
0.01' 0 1/8"
0.02' 0 1/4"
0.03' 0 3/8"
0.04' 0 1/2"
0.05' 0 5/8"
0.06' 0 3/4"
0.07' 0 7/8"
0.08' 1"
0.09' 1 1/8"
0.10' 1 1/4"
0.11' 1 3/8"
0.12' 1 7/16"
0.13' 1 1/2"
0.14' 1 5/8"
0.15' 1 3/4"
0.16' 1 7/8"
0.17' 2"
0.18' 2 1/8"
0.19' 2 1/4"
0.20' 2 3/8"
0.21' 2 1/2"
0.22' 2 5/8"
0.23' 2 3/4"
0.24' 2 7/8"
0.25' 3"
0.26' 3 1/8"
0.27' 3 1/4"
0.28' 3 3/8"
0.29' 3 1/2"
0.30' 3 5/8"
0.31' 3 3/4"
0.32' 3 7/8"
0.33' 4"
0.34' 4 1/8"
0.35' 4 1/4"
0.36' 4 3/8"
0.37' 4 7/16"
0.38' 4 1/2"
0.39' 4 5/8"
0.40' 4 3/4"
0.41' 4 7/8"
0.42' 5"
0.43' 5 1/8"
0.44' 5 1/4"
0.45' 5 3/8"
0.46' 5 1/2"
0.47' 5 5/8"
0.48' 5 3/4"
0.49' 5 7/8"
0.50' 6"
0.51' 6 1/8"
0.52' 6 1/4"
0.53' 6 3/8"
0.54' 6 1/2"
0.55' 6 5/8"
0.56' 6 3/4"
0.57' 6 7/8"
0.58' 7"
0.59' 7 1/8"
0.60' 7 1/4"
0.61' 7 3/8"
0.62' 7 7/16"
0.63' 7 1/2"
0.64' 7 5/8"
0.65' 7 3/4"
0.66' 7 7/8"
0.67' 8"
0.68' 8 1/8"
0.69' 8 1/4"
0.70' 8 3/8"
0.71' 8 1/2"
0.72' 8 5/8"
0.73' 8 3/4"
0.74' 8 7/8"
0.75' 9"
0.76' 9 1/8"
0.77' 9 1/4"
0.78' 9 3/8"
0.79' 9 1/2"
0.80' 9 5/8"
0.81' 9 3/4"
0.82' 9 7/8"
0.83' 10"
0.84' 10 1/8"
0.85' 10 1/4"
0.86' 10 3/8"
0.87' 10 7/16"
0.88' 10 1/2"
0.89' 10 5/8"
0.90' 10 3/4"
0.91' 10 7/8"
0.92' 11"
0.93' 11 1/8"
0.94' 11 1/4"
0.95' 11 3/8"
0.96' 11 1/2"
0.97' 11 5/8"
0.98' 11 3/4"
0.99' 11 7/8"
At Every 1/4" At Intermediate 1/8" Other Decimal Feet (2nd decimal)
' (rounded) ' " ' (rounded) ' " ' "
0.00 0 0 0.01 0.01041667 0.125
0.02 0.0208333 0.25 0.03 0.03125 0.375
0.04 0.04166667 0.5 0.05 0.0520833 0.625
0.06 0.0625 0.75 0.07 0.07291667 0.875
0.08 0.083333 1 0.09 0.09375 1.125
0.10 0.1041667 1.25 0.11 0.114583 1.375 0.12 1.44 = 1 112.64 /256"
0.13 0.125 1.5 0.14 0.1354167 1.625 56.32 /128"
0.15 0.145833 1.75 0.16 0.15625 1.875 28.16 /64"
0.17 0.166667 2 0.18 0.177083 2.125 14.08 /32"
0.19 0.1875 2.25 0.20 0.1979167 2.375 1 7.04 /16"
0.21 0.208333 2.5 0.22 0.21875 2.625 3.52 /8"
0.23 0.2291667 2.75 0.24 0.239583 2.875
0.25 0.25 3 0.26 0.2604167 3.125
0.27 0.270833 3.25 0.28 0.28125 3.375
0.29 0.2916667 3.5 0.30 0.302083 3.625
0.31 0.3125 3.75 0.32 0.3229167 3.875
0.33 0.333333 4 0.34 0.34375 4.125
0.35 0.3541667 4.25 0.36 0.364583 4.375 0.37 4.44 = 4 112.64 /256"
0.38 0.375 4.5 0.39 0.3854167 4.625 4 7 /16"
0.40 0.395833 4.75 0.41 0.40625 4.875
0.42 0.4166667 5 0.43 0.427083 5.125
0.44 0.4375 5.25 0.45 0.4479167 5.375
0.46 0.458333 5.5 0.47 0.46875 5.625
0.48 0.4791667 5.75 0.49 0.489583 5.875
0.50 0.5 6 0.51 0.5104167 6.125
0.52 0.520833 6.25 0.53 0.53125 6.375
0.54 0.5416667 6.5 0.55 0.552083 6.625
0.56 0.5625 6.75 0.57 0.5729167 6.875
0.58 0.583333 7 0.59 0.59375 7.125
0.60 0.6041667 7.25 0.61 0.614583 7.375 0.62 7.44 = 7 112.64 /256"
0.63 0.625 7.5 0.64 0.6354167 7.625 7 7 /16"
0.65 0.645833 7.75 0.66 0.65625 7.875
0.67 0.666667 8 0.68 0.677083 8.125
0.69 0.6875 8.25 0.70 0.6979167 8.375
0.71 0.708333 8.5 0.72 0.71875 8.625
0.73 0.7291667 8.75 0.74 0.739583 8.875
0.75 0.75 9 0.76 0.7604167 9.125
0.77 0.770833 9.25 0.78 0.78125 9.375
0.79 0.7916667 9.5 0.80 0.802083 9.625
0.81 0.8125 9.75 0.82 0.8229167 9.875
0.83 0.83333 10 0.84 0.84375 10.125
0.85 0.8541667 10.25 0.86 0.864583 10.375 0.87 10.44 = 10 112.64 /256"
0.88 0.875 10.5 0.89 0.8854167 10.625 10 7 /16"
0.90 0.895833 10.75 0.91 0.90625 10.875
0.92 0.9166667 11 0.93 0.927083 11.125
0.94 0.9375 11.25 0.95 0.9479167 11.375
0.96 0.958333 11.5 0.97 0.96875 11.625
0.98 0.979167 11.75 0.99 0.989583 11.875

see also T:\Lionel\Decimal Feet Conversion Reference.xlsx