Last Updated: 1 December 2016
[NTM 13,265] Conversion factors53
53
Conversion Factors
Physical Quantity Unit of measurement Conversion factor to metres Symbol length international
nautical mile
micron
mile
chain
yard
foot
link
inch
1852
10–6
1609.344
22 (0.9144)
0.9144
1/3 (0.9144)
22 (0.9144)/100
1 (0.9144)/36
n mile
μ
.........................
ch
yd
ft or ‘
Ik
in or ”square metres area square yard
square foot
square inch
acre
rood
perch(0.9144)2
(0.9144)2/9
(0.9144)2/1296
4840 (0.9144)2
1210 (0.9144)2
30.25 (0.9144)2sq yd or yd2
sq ft or ft2
sq in or in2
ac
rd
pkilograms Mass ton
short ton
hundredweight
quarter
stone
pound
ounce
dram
grain
slug
troy ounce
pennyweight2240 (0.453 592 37)
2000 (0.453 592 37)
112 (0.453 592 37)
28 (0.453 592 37)
14 (0.453 592 37)
1 (0.453 592 37)
1/16 (0.453 592 37)
1/256 (0.453 592 37)
1/7000 (0.453 592 37)
32.174 (0.453 592 37)
480/7000 (0.453 592 37)
24/7000 (0.453 592 37).........................
sh tn
cwt
qr
.........................
lb
oz
dr
gr
.........................
oz tr dwtcubic metres Volume cubic yard
cubic foot
cubic inch
gallon
quart
pint
gill
fluid ounce
fluid drachm
minim(0.9144)3
1/27(0.9144)3
1/46656 (0.9144)3
1x 4.546 09 x 10–3
1/4 x 4.546 09 x 10–3
1/8 x 4.546 09 x 10–3
1/32 x 4.546 09 x 10–3
1/160 x 4.546 09 x 10–3
1/1280 x 4.546 09 x 10–3
1/76800 x 4.546 09 x 10–3cu yd or yd3
cu ft or ft3
cu in or in3
gal
qt
pt
.........................
fl oz
fl dr
minmetres per second Velocity and
speedknot
mile per hour
foot per minute463/900
1609.334/3600
0.3048/60kn
m/h or mph
ft/minjoules Work and Energy kilocalorie
calorie
British thermal unit
gigaelectronvolt
megaelectronvolt
kiloelectronvolt
electronvolt4.1868 x 103
4.1868
1055.056
1.602 189 2 x l0–10
1.602 189 2 x 10–13
1.602 189 2 x 10–16
1.602 189 2 x 10–19kcal
cal
Btu
GeV
MeV
KeV
eVwatts Power horsepower 745.7 hp pascals Pressure millibar
millimetre of
mercury100
133.322 19bar
mmHgpascal seconds Dynamic
Viscositypoise
centipoise10–1
10–3P
cPsquare metres per second Kinematic
Viscositystokes
centistokes10–4
10–6St
cStbecquerels Activity
(radionuclides)curie 3.7 x 1010 μCi coulombs per kilogram Exposure
(ionising
radiation)roentgen 0.258 x 10–3 R grays Absorbed dose,
Absorbed dose
index, Kerma,
Specific energy
imparted
(ionising
radiation)10–2 rad
[reg 53 am LN 99 of 2016 reg 178, effective 1 December 2016]