Conversion Tables

Symbol

Unit

Symbol

Unit

a

are (100 sq m)

km

kilometre

hectare

square kilometre

cm

centimetre

m

metre

cm²

square centimetre

m²

square metre

dm

decimetre

mm

millimetre

dm²

square decimetre

mm²

square millimetre

Plural as for singular

Factor

Multiples and submultiples

Prefix

Symbol

One million

10⁶

mega

M

One thousand

10³

kilo

k

One hundred

10²

hecto

h

Ten

10¹

deca

da

One tenth

10^-1

deci

d

One hundredth

10^-2

centi

c

One thousandth

10^-3

milli

m

One millionth

10^-6

micro

µ

Imperial

(linear)

Imperial

(area)

12 inches

= 1 foot

144 sq. inches

= 1 sq foot

3 feet

= 1 yard

9 sq. feet

= 1 sq yard

5.5 yards

= 1 rod, pole or perch

484 sq. yards

= 1 sq chain (Gunter's)

22 yards

= 1 chain (Gunter's)

10 sq. chains

= 1 acre

10 chains

= 1 furlong

640 acres

= 1 sq mile

8 furlongs

= 1 mile

30.25 sq yards

= 1 sq rod, pole or perch

40 sq poles

= 1 rood

4 roods

= 1 acre

Metric

(linear)

Metric

(area)

10 mm

= 1 cm

100 cm²

= 1 dm²

10 cm

= 1 dm

100 dm²

= 1 m²

100 cm

= 1 m

100 m²

= 1 a

1,000 m

= 1 km

10,000 m²

= 1 ha

100 ha

= 1 km²

Imperial to

Metric (linear)

Imperial to

Metric (area)

1 inch

= 0.0254 m

1 sq foot

= 0.09290304 m²

= 25.4 mm

1 sq yard

= 0.83612736 m²

1 foot

= 0.3048 m

1 sq chain (Gunter's)

= 404.686 m²

1 yard

= 0.9144 m

1 rood

= 1011.71 m²

1 rod, pole or perch

= 5.0292 m

1 acre

= 4046.86 m²

1 link

= 0.201168 m

1 sq link

= 0.0404687m²

1 chain (Gunter's)

= 20.11684 m

1 sq mile

= 258.999 ha

1 chain (engineers)

= 30.48 m

1 furlong

= 201.168 m

1 mile

= 1.609344 km

Metric to

Imperial (linear)

Metric to

Imperial (area)

1 mm

= 0.0393701 inch

1 cm²

= 0.155000 sq inch

1 cm

= 0.393701 inch

1 m²

= 1.19599 sq yards

1 dm

= 3.93701 inches

1 a

= 119.599 sq yards

1 m

= 39.3701 inches

1 ha

= 2.47105 acres

= 3.28084 feet

1 km²

= 247.105 acres

= 1.09361 yards

1 km

= 1093.61 yards

= 0.621371 mile

SCOTS

IMPERIAL

A. LINEAR

8.88 inches

= 1 link

1 Scots inch

= 1.001616 Imp inches

1.35 links

= 1 foot

1 Scots link

= 8.89435 Imp inches

31/12 feet

= 1 ell

1 Scots foot

= 12.019392 Imp inches

6 ells

= 1 fall

1 ell

= 37.0598 Imp inches

4 falls

= 1 chain

= 3.0883166 Imp feet

= 1.0294389 yards

10 chains

= 1 furlong

1 fall

= 6.1766334 yards

8 furlongs

= 1 mile

1 Scots chain

= 24.706533 yards

1 Scots furlong

= 247.06533 yards

1 Scots mile

= 1976.5226 yards

NB To convert Scots ells into Imperial yards multiply by

1.0294389

NB To convert Imperial yards into Scots ells multiply by

0.971403

B. SQUARE

78.8544 sq inches

= 1 Sq link

1 sq Scots inch

= 1.0032346 sq Imp inches

1.82615 sq links

= 1 Sq foot

1 sq Scots link

= 79.109061 sq Imp inches

9.5069 sq feet

= 1 Sq ell

1 sq Scots foot

= 144.46578 sq Imp inches

36 sq ells

= 1 Sq fall

= 1.0032345 sq Imp feet

16 sq falls

= 1 Sq chain

1 sq ell

= 1.0597444 sq yards

2½ sq chains

= 1 Rood

1 sq fall

= 38.150341 sq yards

4 Roods

= 1 Acre

1 sq Scots chain

= 610.40545 sq yards

1 Scots rood