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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 =3.2808 ft
1 rod =1 pole=1 perch=16.5ft(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 degree=0.01745 rad=60 min =3600 s
sin 1 =0.01745241
1 rad = 57.30 degree

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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9 comments on "Units of Measurement"

Nagababu s says:

Please send “Traverse closing error table format “

siddhartha reddy says:

please send abt levelling

s.nagababu says:

pls send open travers open error distribution and closed travers
error dustribution formula.

akhil says:


R Saravanan says:

I need a shutering ( Form Work ) desing formy poject any one help me .

Ananth says:

I need some formulas for civil engineering

rohit waghmare says:

respected sir, i am fresher so i need new prepare drawing in that drawing 1 bed 1 kithchen and 1 hall please tell me and help me

Ghafoor ahmed niazi says:

sir plz tell me how find outer dia meter of bearing by formula plz send formula

vijay sasane says:

Nice and very good

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