3C. CONVERSION TABLES AND STATISTICS
(cd).
LENGTH
SI / Metric
1 centimetre (cm) = 0.394 inch
1 metre (m) = 39.370 inch= 1.094 yards
1 kilometre (km) = 0.621 mile
Imperial
1 inch (in.) = 2.540 cm
1 hand =4 inches
1 foot (ft.) = 12 inches = 30.480 cm
1 yard (yd.) = 36 inches= 0.914 m
1 furlong = 220 yards
1 statute mile = 1760 yards=
1 nautical mile = 2025.333 yards =
AREA
SI / Metric
1 sq. centimetre (cm^2 ) = 0.155 inch^2
1 sq. metre (m^2 ) = 10.764 foot^2
1 are = 100 m^2
1 hectare (ha) = 10,000 m^2 = 2.471 acres
1 sq. kilometre (m^2 ) = 0.386 miles^2
1 manzana =0.700 ha
Imperial
1 sq. inch (in^2 ) = 6.452 cm^2
1 sq. foot (foot^2 ) = 0.093 m^2
1 sq. yard (yard^2 ) = 0.836 m^2
1 acre = 4840 yard^2 = 0.405 ha
WEIGHT
SI / Metric
1 gram (g) = 0.035 ounce
1 kilogram (kg) = 2.205 pounds
1 quintal (qu) = 100 kg
1 metric tonne (MT or tonne) = 1000 kg = 2204.6 pounds = 0.984 short ton
The International System of Units (the SI System—Système International d Unités)
is in essence an expansion of the metric system, which was established in the 18th
century. The SI System is gradually replacing the old metric system so as to incor-
porate more recent technological and scientific developments. The SI System uses
symbols that should not be used in the plural, or be followed by a full-stop or be
written in capitals (except when a capital letter is a symbol). It is based on 7 base
units for 7 base quantities:length (m), mass (kg), time (s), electric current (A),
GROWING FOOD – THE FOOD PRODUCTION HANDBOOK 313
,
thermodynamic temperature (K), amount of substance (mol) & luminous intensity
1608.64 m
1851.154 m