WORLD FOR CIVIL

Units of Measurement

Units of measurement used in past and present surveys are

For construction work: feet, inches, fractions of inches
(m, mm)
For most surveys: feet, tenths, hundredths, thousandths
(m, mm)
For National Geodetic Survey (NGS) control surveys:
meters, 0.1, 0.01, 0.001 m

The most-used equivalents are

1 meter= 39.37 in (exactly)= 3.2808 ft

1 rod =1 pole =1 perch=16.5 ft (5.029 m)

1 engineer’s chain =100 ft =100 links (30.48 m)

1 Gunter’s chain= 66 ft (20.11 m) =100

Gunter’s links (lk) =4 rods=0.020 km

1 acre= 100,000 sq (Gunter’s) links =43,560ft²= 160 rods²= 10 sq (Gunter’s) chains= 4046.87m²= 0.4047 ha

1 rood=1011.5 m²=40 rods²

1 ha= 10,000 m²= 107,639.10 ft²= 2.471 acres

1 arpent =about 0.85 acre, or length of side of
1 square arpent (varies) (about 3439.1 m²)

1 statute mi= 5280 ft =1609.35 m

1 mi²= 640 acres (258.94 ha)
1 nautical mi (U.S.)= 6080.27 ft= 1853.248 m

1 fathom =6 ft (1.829 m)

1 cubit =18 in (0.457 m)

1 vara =33 in (0.838 m) (Calif.), 331 3 in (0.851 m)
(Texas), varies

1 degree=0.01745 rad=60 min =3600 s
sin 1 =0.01745241

1 rad = 57.30degree