Conversions

This section of the annex should be used in conjunction with the abbreviations section.
Please note that the words gallon and tonne have different values depending on whether
the source of the text you are reading is ‘British’ or ‘American’ in origin.

Length:
1 µm 0.001 mm = 0.000001 m
1 mm 0.001 m = 1 000 µm = 0.0394 inch
1 cm 0.01 m = 10 mm = 0.394 inch
1 m 1 000 000 µm = 1 000 mm = 100 cm = 0.001 km = 39.4 inch = 3.28 ft =1.093 yd
1 km 1 000 m = 1 093 yd= 0.621 mi
1 inch 25.38 mm = 2.54 cm
1 ft 12 inch = 0.305 m
1 yd 3 ft = 0.914 m
1 mi 1 760 yd = 1.609 km

Weight:
1 µg 0.001 mg = 0.000001 g
1 mg 0.001 g = 1 000 µg
1 g 1 000 000 µg = 1 000 mg = 0.001 kg = 0.0353 oz
1 kg 1 000 g = 2.205 lb
1 mt 1 000 kg = 1 000 000 g = 0.9842 UK t = 1.102 US t
1 oz 28.349 g
1 lb 16 oz = 453.59 g
1 UK cwt 112 lb = 50.80 kg
1 US cwt 100 lb = 45.36 kg
1 UK t 20 UK cwt = 2 240 lb
1 US t 20 US cwt = 2 000 lb
1 UK t 1.016 mt = 1.12 US t

Volume:
1 µl 0.001 ml = 0.000001 l
1 ml 0.001 l = 1 000 µl = 1 cc
1 L 1 000 000 µl = 1 000 ml = 0.220 UK gallon = 0.264 US gallon
1 m³ 1 000 l = 35.315 ft3 = 1.308 yd3 = 219.97 UK gallons = 264.16 US
gallons
1 ft³ 0.02832 m3 = 6.229 UK gallons = 28.316 l
1 UK gallon 4.546 l = 1.2009 US gallons
1 US gallon 3.785 l = 0.833 UK gallon
1 MGD 694.44 GPM = 3.157 m3/min = 3 157 l/min

Concentration - dissolving solids in liquids:
1 % 1 g in 100 ml
1 ppt 1 g in 1 000 ml = 1 g in 1 l = 1 g/l = 0.1%
1 ppm 1 g in 1 000 000 ml = 1 g in 1 000 L = 1 mg/l = 1 µg/g
1 ppb 1 g in 1 000 000 000 ml = 1 g in 1 000 000 l = 0.001 ppm = 0.001 mg/l

Concentration - dilution of liquids in liquids:
1 % 1 ml in 100 ml
1 ppt 1 ml in 1 000 ml = 1 ml in 1 l = 1 ml/l = 0.1%
1 ppm 1 ml in 1 000 000 ml = 1 ml in 1 000 l = 1 µl/l
1 ppb 1 ml in 1 000 000 000 ml = 1 ml in 1 000 000 l = 0.001 ppm = 0.001 ml/l

Area:
1 m² 10.764 ft² = 1.196 yd²
1 ha 10 000 m² = 100 ares = 2.471 acres
1 km² 100 ha = 0.386 mi²
1 ft² 0.0929 m²
1 yd² 9 ft2 = 0.836 m²
1 acre 4 840 yd² = 0.405 ha
1 mi² 640 acres = 2.59 km²

Temperature:
°F (9 ÷ 5 x °C) + 32
°C (°F - 32) x 5 ÷ 9

Pressure:
1 psi 70.307 g/cm²

Scientific units
Scientists have a different way of writing some of the units described in this glossary.
They use what is called the Système International (SI). The units are referred to as SI
units. For example: 1 ppt, which can be written as 1 g/l (see concentration above) is
written as 1 g l-1 in scientific journals. 1 g/kg is written as 1 g kg-1. 12 mg/kg would be
written as 12 mg kg-1.95 µg/kg would be written as 95 µg kg-1. A stocking density of
11 kg/m3 would be written as 11 kg m-3. This system of standardization is not normally
used in commercial aquaculture hatcheries and grow out units and has therefore not been
used in this manual. More information about this topic can be found on the internet by
searching for SI Units.