Removed constants, usging full unit name instead of symbol

README.md

@@ -60,10 +60,10 @@ Conversion::convert($value,'type')->to('type')
 
 ```php
 
-Conversion::convert(1, 'MB')->to('kB'); // output 1,024.00 ( two decimal place )
+Conversion::convert(1, 'megabyte')->to('kilobyte'); // output 1,024.00 ( two decimal place )
 
 // Formatting the output
-Conversion::convert(1, 'MB')->to('kB')->format(0,'.',','); // output 1,024 ( no decimal place )
+Conversion::convert(1, 'megabyte')->to('kilobyte')->format(0,'.',','); // output 1,024 ( no decimal place )
 
 ```
 
@@ -94,151 +94,135 @@ Conversion::convert(1,'kg')->to('g');
 
 ## Conversion Chart
 
-### Acceleration
-    METRE_PER_SECOND_SQUARED = 'm/s^2';
-
-### Angle
-    TURN = 'turn';
-    RADIAN = 'rad';
-    DEGREE = 'deg';
-    GRADIAN = 'grad';
-
-### Area
-    	// Metric system
-    SQUARE_METRE = 'm^2';
-    HECTARE = 'ha';
-    SQUARE_KILOMETRE = 'km^2';
-    	// Imperial system
-    SQUARE_INCH = 'in^2';
-    SQUARE_FEET = 'ft^2';
-    SQUARE_YARD = 'yd^2';
-    ACRE = 'ac';
-    SQUARE_MILE = 'mi^2';
-
-### Storage
-    BIT = 'b';
-    BYTE = 'B';
-    KILOBIT = 'kb';
-    KILOBYTE = 'kB';
-    MEGABIT = 'Mb';
-    MEGABYTE = 'MB';
-    GIGABIT = 'Gb';
-    GIGABYTE = 'GB';
-    TERABIT = 'Tb';
-    TERABYTE = 'TB';
-    PETABIT = 'Pb';
-    PETABYTE = 'PB';
-
-### Current
-    STATAMPERE = 'statA';
-    MICROAMPERE = 'uA';
-    MILLIAMPERE = 'mA';
-    ABAMPERE = 'aA';
-    AMPERE = 'A';
-    KILOAMPERE = 'kA';
-
-### Fuel
-    	// Metric units
-    KILOMETRES_PER_LITRE = 'km/L';
-    LITRE_PER_100_KILOMETRES = 'L/100 km';
-    	// Imperial units
-    MILES_PER_GALLON = 'mpg';
-    	// US units
-    US_MILES_PER_GALLON = 'us mpg';
-
-### Length
-    	// Metric system
-    MILLIMETRE = 'mm';
-    CENTIMETRE = 'cm';
-    METRE = 'm';
-    KILOMETRE = 'km';
-    	// Imperial system
-    INCH = 'in';
-    FOOT = 'ft';
-    YARD = 'yd';
-    MILE = 'mi';
-    	// Other systems
-    NAUTICAL_MILE = 'nmi';
-
-### Mass
-    	// Metric system
-    MICROGRAM = 'mcg';
-    MILLIGRAM = 'mg';
-    GRAM = 'g';
-    KILOGRAM = 'kg';
-    METRIC_TON = 't';
-    	// Imperial system
-    OUNCE = 'oz';
-    POUND = 'lb';
-    STONE = 'st';
-    SHORT_TON = 's. t.';
-    LONG_TON = 'l. t.';
-### Pressure
-    PASCAL = 'Pa';
-    KILOPASCAL = 'kPa';
-    MEGAPASCAL = 'MPa';
-    BAR = 'bar';
-    MILLIMETRES_OF_MERCURY = 'mmHg';
-    ATMOSPHERE = 'atm';
-    INCHES_OF_MERCURY = 'inHg';
-    POUNDS_PER_SQUARE_INCH = 'psi';
-
-### Speed
-    	// Metric units
-    METRE_PER_SECOND = 'm/s';
-    KILOMETRES_PER_HOUR = 'km/h';
-    	// Imperial units
-    FEET_PER_SECOND = 'ft/s';
-    MILES_PER_HOUR = 'mph';
-   		// Other units
-    KNOT = 'kn';
-
-### Temperature
-    CELSIUS = 'C';
-    FAHRENHEIT = 'F';
-    KELVIN = 'K';
-
-### Time
-    NANOSECOND = 'ns';
-    MICROSECOND = 'us';
-    MILLISECOND = 'ms';
-    SECOND = 's';
-    MINUTE = 'min';
-    HOUR = 'hr';
-    DAY = 'd';
-    WEEK = 'wk';
-    MONTH = 'mo';
-    YEAR = 'a';
-    DECADE = 'decade';
-    CENTURY = 'century';
-    MILLENIUM = 'ka';
-
-### Voltage
-    VOLT = 'V';
-    KILOVOLT = 'KV';
-
-### Volume
-    	// Metric system
-    MILLILITRE = 'mL';
-    LITRE = 'L';
-    CUBIC_METRE = 'm^3';
-    	// Imperial system
-    GALLON = 'gal';
-    QUART = 'qt';
-    PINT = 'pt';
-    CUP = 'c';
-    TABLESPOON = 'tbsp';
-    TEASPOON = 'tsp';
-    	// US system
-    US_GALLON = 'us gal';
-    US_QUART = 'us qt';
-    US_PINT = 'us pt';
-    US_CUP = 'us c';
-    US_OUNCE = 'us oz';
-    US_TABLESPOON = 'us tbsp';
-    US_TEASPOON = 'us tsp';
-    	// Other units
-    CUBIC_INCH = 'in^3';
+## Acceleration         
+       'METRE_PER_SECOND_SQUARE
+                               
+## Angle                
+       'TURN'                  
+       'RADIAN'                
+       'DEGREE'                
+       'GRADIAN'               
+                               
+## Area                 
+       'SQUARE_METRE'          
+       'HECTARE'               
+       'SQUARE_KILOMETRE'      
+       'SQUARE_INCH'           
+       'SQUARE_FEET'           
+       'SQUARE_YARD'           
+       'ACRE'                  
+       'SQUARE_MILE'           
+                               
+## Storage              
+       'BIT'                   
+       'BYTE'                  
+       'KILOBIT'               
+       'KILOBYTE'              
+       'MEGABIT'               
+       'MEGABYTE'              
+       'GIGABIT'               
+       'GIGABYTE'              
+       'TERABIT'               
+       'TERABYTE'              
+       'PETABIT'               
+       'PETABYTE'              
+                               
+## Current              
+       'STATAMPERE'            
+       'MICROAMPERE'           
+       'MILLIAMPERE'           
+       'AMPERE'                
+       'ABAMPERE'              
+       'KILOAMPERE'            
+                               
+## Fuel                 
+       'KILOMETRES_PER_LITRE'  
+       'LITRE_PER_100_KILOMETRE
+       'MILES_PER_GALLON'      
+       'US_MILES_PER_GALLON'   
+                               
+## Length               
+       'MILLIMETRE'            
+       'CENTIMETRE'            
+       'METRE'                 
+       'KILOMETRE'             
+       'INCH'                  
+       'FOOT'                  
+       'YARD'                  
+       'MILE'                  
+       'NAUTICAL_MILE'         
+                               
+## Mass                 
+       'MICROGRAM'             
+       'MILLIGRAM'             
+       'GRAM'                  
+       'KILOGRAM'              
+       'METRIC_TON'            
+       'OUNCE'                 
+       'POUND'                 
+       'STONE'                 
+       'SHORT_TON'             
+       'LONG_TON'              
+                               
+## Pressure             
+       'PASCAL'                
+       'KILOPASCAL'            
+       'MEGAPASCAL'            
+       'BAR'                   
+       'MILLIMETRES_OF_MERCURY'
+       'INCHES_OF_MERCURY'     
+       'POUNDS_PER_SQUARE_INCH'
+       'ATMOSPHERE'            
+                               
+## Speed                
+       'METRE_PER_SECOND'      
+       'KILOMETRES_PER_HOUR'   
+       'FEET_PER_SECOND'       
+       'MILES_PER_HOUR'        
+       'KNOT'                  
+                               
+## Temperature          
+       'CELSIUS'               
+       'FAHRENHEIT'            
+       'KELVIN'                
+                               
+## Time                 
+       'NANOSECOND'            
+       'MICROSECOND'           
+       'MILLISECOND'           
+       'SECOND'                
+       'MINUTE'                
+       'HOUR'                  
+       'DAY'                   
+       'WEEK'                  
+       'MONTH'                 
+       'YEAR'                  
+       'DECADE'                
+       'CENTURY'               
+       'MILLENIUM'             
+                               
+## Voltage              
+       'VOLT'                  
+       'KILOVOLT'              
+                               
+## Volume               
+       'MILLILITRE'            
+       'LITRE'                 
+       'CUBIC_METRE'           
+       'GALLON'                
+       'QUART'                 
+       'PINT'                  
+       'TABLESPOON'            
+       'TEASPOON'              
+       'US_GALLON'             
+       'US_QUART'              
+       'US_PINT'               
+       'US_CUP'                
+       'US_OUNCE'              
+       'US_TABLESPOON'         
+       'US_TEASPOON'           
+       'CUBIC_INCH'            
+       'CUBIC_FOOT'            
 
 
 ## Contribute

src/Abhimanyusharma003/Conversion/Conversion.php

@@ -2,287 +2,139 @@
 
 class Conversion {
 
-    // Acceleration
-    const METRE_PER_SECOND_SQUARED = 'm/s^2';
-
-    // Angle
-    const TURN = 'turn';
-    const RADIAN = 'rad';
-    const DEGREE = 'deg';
-    const GRADIAN = 'grad';
-
-    // Area
-    // Metric system
-    const SQUARE_METRE = 'm^2';
-    const HECTARE = 'ha';
-    const SQUARE_KILOMETRE = 'km^2';
-    // Imperial system
-    const SQUARE_INCH = 'in^2';
-    const SQUARE_FEET = 'ft^2';
-    const SQUARE_YARD = 'yd^2';
-    const ACRE = 'ac';
-    const SQUARE_MILE = 'mi^2';
-
-    // Storage
-    const BIT = 'b';
-    const BYTE = 'B';
-    const KILOBIT = 'kb';
-    const KILOBYTE = 'kB';
-    const MEGABIT = 'Mb';
-    const MEGABYTE = 'MB';
-    const GIGABIT = 'Gb';
-    const GIGABYTE = 'GB';
-    const TERABIT = 'Tb';
-    const TERABYTE = 'TB';
-    const PETABIT = 'Pb';
-    const PETABYTE = 'PB';
-
-    // Current
-    const STATAMPERE = 'statA';
-    const MICROAMPERE = 'uA';
-    const MILLIAMPERE = 'mA';
-    const ABAMPERE = 'aA';
-    const AMPERE = 'A';
-    const KILOAMPERE = 'kA';
-
-    // Fuel
-    // Metric units
-    const KILOMETRES_PER_LITRE = 'km/L';
-    const LITRE_PER_100_KILOMETRES = 'L/100 km';
-    // Imperial units
-    const MILES_PER_GALLON = 'mpg';
-    // US units
-    const US_MILES_PER_GALLON = 'us mpg';
-
-    // Length
-    // Metric system
-    const MILLIMETRE = 'mm';
-    const CENTIMETRE = 'cm';
-    const METRE = 'm';
-    const KILOMETRE = 'km';
-    // Imperial system
-    const INCH = 'in';
-    const FOOT = 'ft';
-    const YARD = 'yd';
-    const MILE = 'mi';
-    // Other systems
-    const NAUTICAL_MILE = 'nmi';
-
-    // Mass
-    // Metric system
-    const MICROGRAM = 'mcg';
-    const MILLIGRAM = 'mg';
-    const GRAM = 'g';
-    const KILOGRAM = 'kg';
-    const METRIC_TON = 't';
-    // Imperial system
-    const OUNCE = 'oz';
-    const POUND = 'lb';
-    const STONE = 'st';
-    const SHORT_TON = 's. t.';
-    const LONG_TON = 'l. t.';
-
-    // Pressure
-    const PASCAL = 'Pa';
-    const KILOPASCAL = 'kPa';
-    const MEGAPASCAL = 'MPa';
-    const BAR = 'bar';
-    const MILLIMETRES_OF_MERCURY = 'mmHg';
-    const ATMOSPHERE = 'atm';
-    const INCHES_OF_MERCURY = 'inHg';
-    const POUNDS_PER_SQUARE_INCH = 'psi';
-
-    // Speed
-    // Metric units
-    const METRE_PER_SECOND = 'm/s';
-    const KILOMETRES_PER_HOUR = 'km/h';
-    // Imperial units
-    const FEET_PER_SECOND = 'ft/s';
-    const MILES_PER_HOUR = 'mph';
-    // Other units
-    const KNOT = 'kn';
-
-    // Temperature
-    const CELSIUS = 'C';
-    const FAHRENHEIT = 'F';
-    const KELVIN = 'K';
-
-    // Time
-    const NANOSECOND = 'ns';
-    const MICROSECOND = 'us';
-    const MILLISECOND = 'ms';
-    const SECOND = 's';
-    const MINUTE = 'min';
-    const HOUR = 'hr';
-    const DAY = 'd';
-    const WEEK = 'wk';
-    const MONTH = 'mo';
-    const YEAR = 'a';
-    const DECADE = 'decade';
-    const CENTURY = 'century';
-    const MILLENIUM = 'ka';
-
-    // Voltage
-    const VOLT = 'V';
-    const KILOVOLT = 'KV';
-
-    // Volume
-    // Metric system
-    const MILLILITRE = 'mL';
-    const LITRE = 'L';
-    const CUBIC_METRE = 'm^3';
-    // Imperial system
-    const GALLON = 'gal';
-    const QUART = 'qt';
-    const PINT = 'pt';
-    const CUP = 'c';
-    const TABLESPOON = 'tbsp';
-    const TEASPOON = 'tsp';
-    // US system
-    const US_GALLON = 'us gal';
-    const US_QUART = 'us qt';
-    const US_PINT = 'us pt';
-    const US_CUP = 'us c';
-    const US_OUNCE = 'us oz';
-    const US_TABLESPOON = 'us tbsp';
-    const US_TEASPOON = 'us tsp';
-    // Other units
-    const CUBIC_INCH = 'in^3';
-    const CUBIC_FOOT = 'ft^3';
-
     /**
      * @var array
      */
     protected static $conversionChart = array(
         // Acceleration
-        Conversion::METRE_PER_SECOND_SQUARED => 1,
+        'METRE_PER_SECOND_SQUARED' => 1,
 
         // Angle
-        Conversion::TURN                     => 6.28318531,
-        Conversion::RADIAN                   => 1,
-        Conversion::DEGREE                   => 0.0174532925,
-        Conversion::GRADIAN                  => 0.015707963267949,
+        'TURN'                     => 6.28318531,
+        'RADIAN'                   => 1,
+        'DEGREE'                   => 0.0174532925,
+        'GRADIAN'                  => 0.015707963267949,
 
         // Area
-        Conversion::SQUARE_METRE             => 1,
-        Conversion::HECTARE                  => 100,
-        Conversion::SQUARE_KILOMETRE         => 1000000,
-        Conversion::SQUARE_INCH              => 0.00064516,
-        Conversion::SQUARE_FEET              => 0.09290304,
-        Conversion::SQUARE_YARD              => 0.83612736,
-        Conversion::ACRE                     => 247.105,
-        Conversion::SQUARE_MILE              => 2589988.110336,
+        'SQUARE_METRE'             => 1,
+        'HECTARE'                  => 100,
+        'SQUARE_KILOMETRE'         => 1000000,
+        'SQUARE_INCH'              => 0.00064516,
+        'SQUARE_FEET'              => 0.09290304,
+        'SQUARE_YARD'              => 0.83612736,
+        'ACRE'                     => 247.105,
+        'SQUARE_MILE'              => 2589988.110336,
 
         // Storage
-        Conversion::BIT                      => 0.00012207,
-        Conversion::BYTE                     => 0.000976563,
-        Conversion::KILOBIT                  => 0.125,
-        Conversion::KILOBYTE                 => 1,
-        Conversion::MEGABIT                  => 128,
-        Conversion::MEGABYTE                 => 1024,
-        Conversion::GIGABIT                  => 131072,
-        Conversion::GIGABYTE                 => 1.049e+6,
-        Conversion::TERABIT                  => 1.342e+8,
-        Conversion::TERABYTE                 => 1.074e+9,
-        Conversion::PETABIT                  => 1.374e+11,
-        Conversion::PETABYTE                 => 1.1e+12,
+        'BIT'                      => 0.00012207,
+        'BYTE'                     => 0.000976563,
+        'KILOBIT'                  => 0.125,
+        'KILOBYTE'                 => 1,
+        'MEGABIT'                  => 128,
+        'MEGABYTE'                 => 1024,
+        'GIGABIT'                  => 131072,
+        'GIGABYTE'                 => 1.049e+6,
+        'TERABIT'                  => 1.342e+8,
+        'TERABYTE'                 => 1.074e+9,
+        'PETABIT'                  => 1.374e+11,
+        'PETABYTE'                 => 1.1e+12,
 
         // Current
-        Conversion::STATAMPERE               => 3.33564e-10,
-        Conversion::MICROAMPERE              => 1e-06,
-        Conversion::MILLIAMPERE              => 0.001,
-        Conversion::AMPERE                   => 1,
-        Conversion::ABAMPERE                 => 10,
-        Conversion::KILOAMPERE               => 1000,
+        'STATAMPERE'               => 3.33564e-10,
+        'MICROAMPERE'              => 1e-06,
+        'MILLIAMPERE'              => 0.001,
+        'AMPERE'                   => 1,
+        'ABAMPERE'                 => 10,
+        'KILOAMPERE'               => 1000,
 
         // Fuel
-        Conversion::KILOMETRES_PER_LITRE     => 1,
-        Conversion::LITRE_PER_100_KILOMETRES => 100,
-        Conversion::MILES_PER_GALLON         => 0.354006,
-        Conversion::US_MILES_PER_GALLON      => 0.425144,
+        'KILOMETRES_PER_LITRE'     => 1,
+        'LITRE_PER_100_KILOMETRES' => 100,
+        'MILES_PER_GALLON'         => 0.354006,
+        'US_MILES_PER_GALLON'      => 0.425144,
 
         // Length
-        Conversion::MILLIMETRE               => 0.001,
-        Conversion::CENTIMETRE               => 0.01,
-        Conversion::METRE                    => 1,
-        Conversion::KILOMETRE                => 1000,
-        Conversion::INCH                     => 0.0254,
-        Conversion::FOOT                     => 0.3048,
-        Conversion::YARD                     => 0.9144,
-        Conversion::MILE                     => 1609.34,
-        Conversion::NAUTICAL_MILE            => 1852,
+        'MILLIMETRE'               => 0.001,
+        'CENTIMETRE'               => 0.01,
+        'METRE'                    => 1,
+        'KILOMETRE'                => 1000,
+        'INCH'                     => 0.0254,
+        'FOOT'                     => 0.3048,
+        'YARD'                     => 0.9144,
+        'MILE'                     => 1609.34,
+        'NAUTICAL_MILE'            => 1852,
 
         // Mass
-        Conversion::MICROGRAM                => 1e-7,
-        Conversion::MILLIGRAM                => 1e-6,
-        Conversion::GRAM                     => 0.001,
-        Conversion::KILOGRAM                 => 1,
-        Conversion::METRIC_TON               => 100,
-        Conversion::OUNCE                    => 0.0283495,
-        Conversion::POUND                    => 0.453592,
-        Conversion::STONE                    => 6.35029,
-        Conversion::SHORT_TON                => 907.185,
-        Conversion::LONG_TON                 => 1016.0469088,
+        'MICROGRAM'                => 1e-7,
+        'MILLIGRAM'                => 1e-6,
+        'GRAM'                     => 0.001,
+        'KILOGRAM'                 => 1,
+        'METRIC_TON'               => 100,
+        'OUNCE'                    => 0.0283495,
+        'POUND'                    => 0.453592,
+        'STONE'                    => 6.35029,
+        'SHORT_TON'                => 907.185,
+        'LONG_TON'                 => 1016.0469088,
 
         // Pressure
-        Conversion::PASCAL                   => 1,
-        Conversion::KILOPASCAL               => 1000,
-        Conversion::MEGAPASCAL               => 1e6,
-        Conversion::BAR                      => 1e5,
-        Conversion::MILLIMETRES_OF_MERCURY   => 133.3224,
-        Conversion::INCHES_OF_MERCURY        => 3.386389e3,
-        Conversion::POUNDS_PER_SQUARE_INCH   => 6.894757e3,
-        Conversion::ATMOSPHERE               => 101325,
+        'PASCAL'                   => 1,
+        'KILOPASCAL'               => 1000,
+        'MEGAPASCAL'               => 1e6,
+        'BAR'                      => 1e5,
+        'MILLIMETRES_OF_MERCURY'   => 133.3224,
+        'INCHES_OF_MERCURY'        => 3.386389e3,
+        'POUNDS_PER_SQUARE_INCH'   => 6.894757e3,
+        'ATMOSPHERE'               => 101325,
 
         // Speed
-        Conversion::METRE_PER_SECOND         => 1,
-        Conversion::KILOMETRES_PER_HOUR      => 0.277778,
-        Conversion::FEET_PER_SECOND          => 0.3048,
-        Conversion::MILES_PER_HOUR           => 0.44704,
-        Conversion::KNOT                     => 0.514444,
+        'METRE_PER_SECOND'         => 1,
+        'KILOMETRES_PER_HOUR'      => 0.277778,
+        'FEET_PER_SECOND'          => 0.3048,
+        'MILES_PER_HOUR'           => 0.44704,
+        'KNOT'                     => 0.514444,
 
         // Temperature
-        Conversion::CELSIUS                  => 273.15,
-        Conversion::FAHRENHEIT               => 255.372,
-        Conversion::KELVIN                   => 1,
+        'CELSIUS'                  => 273.15,
+        'FAHRENHEIT'               => 255.372,
+        'KELVIN'                   => 1,
 
         // Time
-        Conversion::NANOSECOND               => 1e-9,
-        Conversion::MICROSECOND              => 1e-6,
-        Conversion::MILLISECOND              => 0.001,
-        Conversion::SECOND                   => 1,
-        Conversion::MINUTE                   => 60,
-        Conversion::HOUR                     => 3600,
-        Conversion::DAY                      => 86400,
-        Conversion::WEEK                     => 604800,
-        Conversion::MONTH                    => 2.62974e6,
-        Conversion::YEAR                     => 3.15569e7,
-        Conversion::DECADE                   => 3.15569e8,
-        Conversion::CENTURY                  => 3.15569e9,
-        Conversion::MILLENIUM                => 3.1556926e10,
+        'NANOSECOND'               => 1e-9,
+        'MICROSECOND'              => 1e-6,
+        'MILLISECOND'              => 0.001,
+        'SECOND'                   => 1,
+        'MINUTE'                   => 60,
+        'HOUR'                     => 3600,
+        'DAY'                      => 86400,
+        'WEEK'                     => 604800,
+        'MONTH'                    => 2.62974e6,
+        'YEAR'                     => 3.15569e7,
+        'DECADE'                   => 3.15569e8,
+        'CENTURY'                  => 3.15569e9,
+        'MILLENIUM'                => 3.1556926e10,
 
         // Voltage
-        Conversion::VOLT                     => 1,
-        Conversion::KILOVOLT                 => 1000,
+        'VOLT'                     => 1,
+        'KILOVOLT'                 => 1000,
 
         // Volume
-        Conversion::MILLILITRE               => 1e-6,
-        Conversion::LITRE                    => 0.001,
-        Conversion::CUBIC_METRE              => 1,
-        Conversion::GALLON                   => 0.00454609,
-        Conversion::QUART                    => 0.00113652,
-        Conversion::PINT                     => 0.000568261,
-        Conversion::TABLESPOON               => 1.7758e-5,
-        Conversion::TEASPOON                 => 5.9194e-6,
-        Conversion::US_GALLON                => 0.00378541,
-        Conversion::US_QUART                 => 0.000946353,
-        Conversion::US_PINT                  => 0.000473176,
-        Conversion::US_CUP                   => 0.000236588,
-        Conversion::US_OUNCE                 => 2.9574e-5,
-        Conversion::US_TABLESPOON            => 1.4787e-5,
-        Conversion::US_TEASPOON              => 4.9289e-6,
-        Conversion::CUBIC_INCH               => 1.6387e-5,
-        Conversion::CUBIC_FOOT               => 0.0283168,
+        'MILLILITRE'               => 1e-6,
+        'LITRE'                    => 0.001,
+        'CUBIC_METRE'              => 1,
+        'GALLON'                   => 0.00454609,
+        'QUART'                    => 0.00113652,
+        'PINT'                     => 0.000568261,
+        'TABLESPOON'               => 1.7758e-5,
+        'TEASPOON'                 => 5.9194e-6,
+        'US_GALLON'                => 0.00378541,
+        'US_QUART'                 => 0.000946353,
+        'US_PINT'                  => 0.000473176,
+        'US_CUP'                   => 0.000236588,
+        'US_OUNCE'                 => 2.9574e-5,
+        'US_TABLESPOON'            => 1.4787e-5,
+        'US_TEASPOON'              => 4.9289e-6,
+        'CUBIC_INCH'               => 1.6387e-5,
+        'CUBIC_FOOT'               => 0.0283168,
     );
 
     /**
@@ -365,7 +217,7 @@ class Conversion {
      */
     protected function getConversion($unit)
     {
-        if ( ! isset(static::$conversionChart[$unit]))
+        if ( ! isset(static::$conversionChart[strtoupper($unit)]))
         {
             throw new \Exception(sprintf(
                 'No conversation between "%s" and "%s" is defined.',
@@ -374,7 +226,7 @@ class Conversion {
             ));
         }
 
-        return static::$conversionChart[$unit];
+        return static::$conversionChart[strtoupper($unit)];
     }