protected $_units = array(
'ARRATEL' => array('0.5', 'arratel'),
'ARTEL' => array('0.5', 'artel'),
'ARROBA_PORTUGUESE' => array('14.69', 'arroba'),
'ARROBA' => array('11.502', '@'),
'AS_' => array('0.000052', 'as'),
'ASS' => array('0.000052', 'ass'),
'ATOMIC_MASS_UNIT_1960' => array('1.6603145e-27', 'amu'),
'ATOMIC_MASS_UNIT_1973' => array('1.6605655e-27', 'amu'),
'ATOMIC_MASS_UNIT_1986' => array('1.6605402e-27', 'amu'),
'ATOMIC_MASS_UNIT' => array('1.66053873e-27', 'amu'),
'AVOGRAM' => array('1.6605402e-27', 'avogram'),
'BAG' => array('42.63768278', 'bag'),
'BAHT' => array('0.015', 'baht'),
'BALE' => array('326.5865064', 'bl'),
'BALE_US' => array('217.7243376', 'bl'),
'BISMAR_POUND' => array('5.993', 'bismar pound'),
'CANDY' => array('254', 'candy'),
'CARAT_INTERNATIONAL' => array('0.0002', 'ct'),
'CARAT' => array('0.0002', 'ct'),
'CARAT_UK' => array('0.00025919564', 'ct'),
'CARAT_US_1913' => array('0.0002053', 'ct'),
'CARGA' => array('140', 'carga'),
'CATTI' => array('0.604875', 'catti'),
'CATTI_JAPANESE' => array('0.594', 'catti'),
'CATTY' => array('0.5', 'catty'),
'CATTY_JAPANESE' => array('0.6', 'catty'),
'CATTY_THAI' => array('0.6', 'catty'),
'CENTAL' => array('45.359237', 'cH'),
'CENTIGRAM' => array('0.00001', 'cg'),
'CENTNER' => array('50', 'centner'),
'CENTNER_RUSSIAN' => array('100', 'centner'),
'CHALDER' => array('2692.52', 'chd'),
'CHALDRON' => array('2692.52', 'chd'),
'CHIN' => array('0.5', 'chin'),
'CHIN_JAPANESE' => array('0.6', 'chin'),
'CLOVE' => array('3.175', 'clove'),
'CRITH' => array('0.000089885', 'crith'),
'DALTON' => array('1.6605402e-27', 'D'),
'DAN' => array('50', 'dan'),
'DAN_JAPANESE' => array('60', 'dan'),
'DECIGRAM' => array('0.0001', 'dg'),
'DECITONNE' => array('100', 'dt'),
'DEKAGRAM' => array('0.01', 'dag'),
'DEKATONNE' => array('10000', 'dat'),
'DENARO' => array('0.0011', 'denaro'),
'DENIER' => array('0.001275', 'denier'),
'DRACHME' => array('0.0038', 'drachme'),
'DRAM' => array(array('' => '0.45359237', '/' => '256'), 'dr'),
'DRAM_APOTHECARIES' => array('0.0038879346', 'dr'),
'DYNE' => array('1.0197162e-6', 'dyn'),
'ELECTRON' => array('9.109382e-31', 'e−'),
'ELECTRONVOLT' => array('1.782662e-36', 'eV'),
'ETTO' => array('0.1', 'hg'),
'EXAGRAM' => array('1.0e+15', 'Eg'),
'FEMTOGRAM' => array('1.0e-18', 'fg'),
'FIRKIN' => array('25.40117272', 'fir'),
'FLASK' => array('34.7', 'flask'),
'FOTHER' => array('979.7595192', 'fother'),
'FOTMAL' => array('32.65865064', 'fotmal'),
'FUNT' => array('0.4095', 'funt'),
'FUNTE' => array('0.4095', 'funte'),
'GAMMA' => array('0.000000001', 'gamma'),
'GIGAELECTRONVOLT' => array('1.782662e-27', 'GeV'),
'GIGAGRAM' => array('1000000', 'Gg'),
'GIGATONNE' => array('1.0e+12', 'Gt'),
'GIN' => array('0.6', 'gin'),
'GIN_JAPANESE' => array('0.594', 'gin'),
'GRAIN' => array('0.00006479891', 'gr'),
'GRAM' => array('0.001', 'g'),
'GRAN' => array('0.00082', 'gran'),
'GRANO' => array('0.00004905', 'grano'),
'GRANI' => array('0.00004905', 'grani'),
'GROS' => array('0.003824', 'gros'),
'HECTOGRAM' => array('0.1', 'hg'),
'HUNDRETWEIGHT' => array('50.80234544', 'cwt'),
'HUNDRETWEIGHT_US' => array('45.359237', 'cwt'),
'HYL' => array('9.80665', 'hyl'),
'JIN' => array('0.5', 'jin'),
'JUPITER' => array('1.899e+27', 'jupiter'),
'KATI' => array('0.5', 'kati'),
'KATI_JAPANESE' => array('0.6', 'kati'),
'KEEL' => array('21540.19446656', 'keel'),
'KEG' => array('45.359237', 'keg'),
'KILODALTON' => array('1.6605402e-24', 'kD'),
'KILOGRAM' => array('1', 'kg'),
'KILOGRAM_FORCE' => array('1', 'kgf'),
'KILOTON' => array('1016046.9088', 'kt'),
'KILOTON_US' => array('907184.74', 'kt'),
'KILOTONNE' => array('1000000', 'kt'),
'KIN' => array('0.6', 'kin'),
'KIP' => array('453.59237', 'kip'),
'KOYAN' => array('2419', 'koyan'),
'KWAN' => array('3.75', 'kwan'),
'LAST_GERMANY' => array('2000', 'last'),
'LAST' => array('1814.36948', 'last'),
'LAST_WOOL' => array('1981.29147216', 'last'),
'LB' => array('0.45359237', 'lb'),
'LBS' => array('0.45359237', 'lbs'),
'LIANG' => array('0.05', 'liang'),
'LIBRE_ITALIAN' => array('0.339', 'lb'),
'LIBRA_SPANISH' => array('0.459', 'lb'),
'LIBRA_PORTUGUESE' => array('0.459', 'lb'),
'LIBRA_ANCIENT' => array('0.323', 'lb'),
'LIBRA' => array('1', 'lb'),
'LIVRE' => array('0.4895', 'livre'),
'LONG_TON' => array('1016.0469088', 't'),
'LOT' => array('0.015', 'lot'),
'MACE' => array('0.003778', 'mace'),
'MAHND' => array('0.9253284348', 'mahnd'),
'MARC' => array('0.24475', 'marc'),
'MARCO' => array('0.23', 'marco'),
'MARK' => array('0.2268', 'mark'),
'MARK_GERMANY' => array('0.2805', 'mark'),
'MAUND' => array('37.3242', 'maund'),
'MAUND_PAKISTAN' => array('40', 'maund'),
'MEGADALTON' => array('1.6605402e-21', 'MD'),
'MEGAGRAM' => array('1000', 'Mg'),
'MEGATONNE' => array('1.0e+9', 'Mt'),
'MERCANTILE_POUND' => array('0.46655', 'lb merc'),
'METRIC_TON' => array('1000', 't'),
'MIC' => array('1.0e-9', 'mic'),
'MICROGRAM' => array('1.0e-9', '�g'),
'MILLIDALTON' => array('1.6605402e-30', 'mD'),
'MILLIER' => array('1000', 'millier'),
'MILLIGRAM' => array('0.000001', 'mg'),
'MILLIMASS_UNIT' => array('1.6605402e-30', 'mmu'),
'MINA' => array('0.499', 'mina'),
'MOMME' => array('0.00375', 'momme'),
'MYRIAGRAM' => array('10', 'myg'),
'NANOGRAM' => array('1.0e-12', 'ng'),
'NEWTON' => array('0.101971621', 'N'),
'OBOL' => array('0.0001', 'obol'),
'OBOLOS' => array('0.0001', 'obolos'),
'OBOLUS' => array('0.0001', 'obolus'),
'OBOLOS_ANCIENT' => array('0.0005', 'obolos'),
'OBOLUS_ANCIENT' => array('0.00057', 'obolos'),
'OKA' => array('1.28', 'oka'),
'ONCA' => array('0.02869', 'onca'),
'ONCE' => array('0.03059', 'once'),
'ONCIA' => array('0.0273', 'oncia'),
'ONZA' => array('0.02869', 'onza'),
'ONS' => array('0.1', 'ons'),
'OUNCE' => array(array('' => '0.45359237', '/' => '16'), 'oz'),
'OUNCE_FORCE' => array(array('' => '0.45359237', '/' => '16'), 'ozf'),
'OUNCE_TROY' => array(array('' => '65.31730128', '/' => '2100'), 'oz'),
'PACKEN' => array('490.79', 'packen'),
'PENNYWEIGHT' => array(array('' => '65.31730128', '/' => '42000'), 'dwt'),
'PETAGRAM' => array('1.0e+12', 'Pg'),
'PFUND' => array('0.5', 'pfd'),
'PICOGRAM' => array('1.0e-15', 'pg'),
'POINT' => array('0.000002', 'pt'),
'POND' => array('0.5', 'pond'),
'POUND' => array('0.45359237', 'lb'),
'POUND_FORCE' => array('0.4535237', 'lbf'),
'POUND_METRIC' => array('0.5', 'lb'),
'POUND_TROY' => array(array('' => '65.31730128', '/' => '175'), 'lb'),
'PUD' => array('16.3', 'pud'),
'POOD' => array('16.3', 'pood'),
'PUND' => array('0.5', 'pund'),
'QIAN' => array('0.005', 'qian'),
'QINTAR' => array('50', 'qintar'),
'QUARTER' => array('12.70058636', 'qtr'),
'QUARTER_US' => array('11.33980925', 'qtr'),
'QUARTER_TON' => array('226.796185', 'qtr'),
'QUARTERN' => array('1.587573295', 'quartern'),
'QUARTERN_LOAF' => array('1.81436948', 'quartern-loaf'),
'QUINTAL_FRENCH' => array('48.95', 'q'),
'QUINTAL' => array('100', 'q'),
'QUINTAL_PORTUGUESE' => array('58.752', 'q'),
'QUINTAL_SPAIN' => array('45.9', 'q'),
'REBAH' => array('0.2855', 'rebah'),
'ROTL' => array('0.5', 'rotl'),
'ROTEL' => array('0.5', 'rotel'),
'ROTTLE' => array('0.5', 'rottle'),
'RATEL' => array('0.5', 'ratel'),
'SACK' => array('165.10762268', 'sack'),
'SCRUPLE' => array(array('' => '65.31730128', '/' => '50400'), 's'),
'SEER' => array('0.933105', 'seer'),
'SEER_PAKISTAN' => array('1', 'seer'),
'SHEKEL' => array('0.01142', 'shekel'),
'SHORT_TON' => array('907.18474', 'st'),
'SLINCH' => array('175.126908', 'slinch'),
'SLUG' => array('14.593903', 'slug'),
'STONE' => array('6.35029318', 'st'),
'TAEL' => array('0.03751', 'tael'),
'TAHIL_JAPANESE' => array('0.03751', 'tahil'),
'TAHIL' => array('0.05', 'tahil'),
'TALENT' => array('30', 'talent'),
'TAN' => array('50', 'tan'),
'TECHNISCHE_MASS_EINHEIT' => array('9.80665', 'TME'),
'TERAGRAM' => array('1.0e+9', 'Tg'),
'TETRADRACHM' => array('0.014', 'tetradrachm'),
'TICAL' => array('0.0164', 'tical'),
'TOD' => array('12.70058636', 'tod'),
'TOLA' => array('0.0116638125', 'tola'),
'TOLA_PAKISTAN' => array('0.0125', 'tola'),
'TON_UK' => array('1016.0469088', 't'),
'TON' => array('1000', 't'),
'TON_US' => array('907.18474', 't'),
'TONELADA_PORTUGUESE' => array('793.15', 'tonelada'),
'TONELADA' => array('919.9', 'tonelada'),
'TONNE' => array('1000', 't'),
'TONNEAU' => array('979', 'tonneau'),
'TOVAR' => array('128.8', 'tovar'),
'TROY_OUNCE' => array(array('' => '65.31730128', '/' => '2100'), 'troy oz'),
'TROY_POUND' => array(array('' => '65.31730128', '/' => '175'), 'troy lb'),
'TRUSS' => array('25.40117272', 'truss'),
'UNCIA' => array('0.0272875', 'uncia'),
'UNZE' => array('0.03125', 'unze'),
'VAGON' => array('10000', 'vagon'),
'YOCTOGRAM' => array('1.0e-27', 'yg'),
'YOTTAGRAM' => array('1.0e+21', 'Yg'),
'ZENTNER' => array('50', 'Ztr'),
'ZEPTOGRAM' => array('1.0e-24', 'zg'),
'ZETTAGRAM' => array('1.0e+18', 'Zg'),
'STANDARD' => 'KILOGRAM'
)
Calculations for all weight units
Var
array