diff --git a/lib/DDG/Goodie/Conversions.pm b/lib/DDG/Goodie/Conversions.pm
index dbda539fb..28fd8b16e 100644
--- a/lib/DDG/Goodie/Conversions.pm
+++ b/lib/DDG/Goodie/Conversions.pm
@@ -3,61 +3,93 @@ package DDG::Goodie::Conversions;
 
 use DDG::Goodie;
 use Scalar::Util qw(looks_like_number);
-use Math::Round;
 
 # metric ton is base unit
-# known SI units and aliases
+# known SI units and aliases / plurals
 my %units = (
     # metric ton:
-    'metric ton'   => '1',
-    'tonne'        => '1',
-    't'            => '1',
-    'mt'           => '1',
-    'te'           => '1',
+    'metric ton'    => '1',
+    'tonne'         => '1',
+    't'             => '1',
+    'mt'            => '1',
+    'te'            => '1',
+    'metric tons'   => '1',
+    'tonnes'        => '1',
+    'ts'            => '1',
+    'mts'           => '1',
+    'tes'           => '1',
     
     # kilogram:
-    'kilogram'     => '1000',
-    'kg'           => '1000',
-    'kilo'         => '1000',
-    'kilogramme'   => '1000',
+    'kilogram'      => '1000',
+    'kg'            => '1000',
+    'kilo'          => '1000',
+    'kilogramme'    => '1000',
+    'kilograms'     => '1000',
+    'kgs'           => '1000',
+    'kilos'         => '1000',
+    'kilogrammes'   => '1000',
      
     # gram:
-    'gram'         => '1000000',
-    'g'            => '1000000',
-    'gm'           => '1000000',
-    'gramme'       => '1000000',
+    'gram'          => '1000000',
+    'g'             => '1000000',
+    'gm'            => '1000000',
+    'gramme'        => '1000000',
+    'grams'         => '1000000',
+    'gs'            => '1000000',
+    'gms'           => '1000000',
+    'grammes'       => '1000000',
     
     # milligram:
-    'milligram'    => '1000000000',
-    'mg'           => '1000000000',
+    'milligram'     => '1000000000',
+    'mg'            => '1000000000',
+    'milligrams'    => '1000000000',
+    'mgs'           => '1000000000',
     
     # microgram:
-    'microgram'    => '1000000000',
-    'mcg'          => '1000000000',
+    'microgram'     => '1000000000',
+    'mcg'           => '1000000000',
+    'micrograms'    => '1000000000',
+    'mcgs'          => '1000000000',
     
     # long ton:
-    'long ton'     => '0.984207',
-    'weight ton'   => '0.984207',
-    'imperial ton' => '0.984207',
+    'long ton'      => '0.984207',
+    'weight ton'    => '0.984207',
+    'imperial ton'  => '0.984207',
+    'long tons'     => '0.984207',
+    'weight tons'   => '0.984207',
+    'imperial tons' => '0.984207',
     
     # short ton:
-    'short ton'    => '1.10231',
-    'ton'          => '1.10231',
+    'short ton'     => '1.10231',
+    'ton'           => '1.10231',
+    'short tons'    => '1.10231',
+    'tons'          => '1.10231',
 
     # stone:
-    'stone'        => '157.473',
-    'st'           => '157.473',
-
+    'stone'         => '157.473',
+    'st'            => '157.473',
+    'stones'        => '157.473',
+    'sts'           => '157.473',
+ 
     # pound:
-    'pound'        => '2204.62',
-    'lb'           => '2204.62',
-    'lbm'          => '2204.62',
-    'pound mass'   => '2204.62',
+    'pound'         => '2204.62',
+    'lb'            => '2204.62',
+    'lbm'           => '2204.62',
+    'pound mass'    => '2204.62',
+    'pounds'        => '2204.62',
+    'lbs'           => '2204.62',
+    'lbms'          => '2204.62',
+    'pounds mass'   => '2204.62',
 
     # ounce:
     'ounce'        => '35274',
     'oz'           => '35274',
+    'ounces'       => '35274',
+    'ozs'          => '35274',
 );
+    
+# match longest possible key (some keys are sub-keys of other keys):
+my $keys = join '|', reverse sort { length($a) <=> length($b) } keys %units;
 
 # build triggers based on available conversion units:
 triggers startend => keys %units;
@@ -67,7 +99,7 @@ description               'convert between various weights and measures';
 category                  'calculations';
 topics                    'computing', 'math';
 primary_example_queries   'convert 5 oz to grams';
-secondary_example_queries '5 ounces to g';
+secondary_example_queries '5 ounces to g', 'metric ton stone';
 code_url                  'https://github.com/duckduckgo/zeroclickinfo-goodies/blob/master/lib/DDG/Goodie/Conversions.pm';
 attribution                github  => ['https://github.com/elohmrow', '/bda'],
                            email   => ['bradley@pvnp.us'];
@@ -75,9 +107,7 @@ attribution                github  => ['https://github.com/elohmrow', '/bda'],
 zci answer_type => 'conversions';
 
 handle query => sub {
-    # match longest possible key (some keys are sub-keys of other keys):
-    my $keys = join '|', reverse sort { length($a) <=> length($b) } keys %units;
-    my @matches = ($_ =~ /\b($keys)s?\b/gi);
+    my @matches = ($_ =~ /\b($keys)\b/gi);
     
     return unless scalar @matches == 2; # conversion requires two triggers
 
diff --git a/t/Conversions.t b/t/Conversions.t
index f922265d6..c55e2f1a8 100644
--- a/t/Conversions.t
+++ b/t/Conversions.t
@@ -21,11 +21,15 @@ ddg_goodie_test(
     'convert 0.111 stone to pound' => test_zci('0.111 stone is 1.554 pound',),
     'mcg to mcg'                   => test_zci('1 mcg is 1.000 mcg',),
     '3 kilogramme to pound'        => test_zci('3 kilogramme is 6.614 pound',),
-    '1.3 tonnes to ton'            => test_zci('1.3 tonne is 1.433 ton',),
+    '1.3 tonnes to ton'            => test_zci('1.3 tonnes is 1.433 ton',),
     'stone pound'                  => test_zci('1 stone is 14.000 pound',),
     'gram pound convert'           => test_zci('1 gram is 0.002 pound',),
     "convert 1 ton to long ton"    => test_zci('1 ton is 0.893 long ton',),
     'puff toke to kludge'          => undef,
+    '2 tons to kg'                 => test_zci('2 tons is 1814.372 kg',),
+    '1 ton to kilos'               => test_zci('1 ton is 907.186 kilos',),
+    '3.9 oz g'                     => test_zci('3.9 oz is 110.563 g',),
+    'convert -9 g to ozs'          => undef,
 );
 
 done_testing;