Metric
You must use metric measure in your writing.
It's decades since Australia switched to metric. You should use only metric measurements. There are some exceptions such as sailing magazines that still like to write about 36 foot yachts and 22 fathoms down. If you feel readers need to also know the old imperial measure, then put the accurate imperial equivalent in brackets after the metric measurement, like this: The knife is 15cm (6 inches) long.
Conversion tables:
Symbol
When You Know
Multiply By
To Find
Symbol
Length
in
inches
25.4
millimetres
mm
ft
feet
0.305
metres
m
yd
yards
0.914
metres
m
mi
miles
1.61
kilometres
km
Area
in2
square inches
645.2
square millimetres
mm2
ft2
square feet
0.093
square metres
m2
yd2
square yard
0.836
square meters
m2
ac
acres
0.405
hectares
ha
mi2
square miles
2.59
square kilometers
km2
Volume
fl oz
fluid ounces
29.57
millilitres
mL
gal
gallons
3.785
litres
L
ft3
cubic feet
0.028
cubic metres
m3
yd3
cubic yards
0.765
cubic metres
m3
Mass
oz
ounces
28.35
grams
g
lb
pounds
0.454
kilograms
kg
T
short tons (2000 lb)
0.907
megagrams (or "metric ton")
Mg (or "t")
Temperature
oF
Fahrenheit
(F-32) x 5 / 9
or
(F-32) / 1.8
Celsius
oC
Illumination
fc
foot-candles
10.76
lux
lx
fl
foot-Lambrets
3.426
candela/m2
cd/m2
FORCE and PRESSURE or STRESS
lbf
poundforce
4.45
newtons
N
lbf/in2
poundforce pre square inch
6.89
kilopascals
kPa