diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 3ac7cb6ffb377fa641149b10be3f18c9b37c6558..b87b3d28ea8f1a8793142e17f6884e4fb02a1c4c 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -3097,9 +3097,18 @@ abstract class CommonObject
                 $trueWeightUnit=pow(10, $weightUnit);
                 $totalWeight += $weight * $qty * $trueWeightUnit;
             }
-            else
-            {
-                $totalWeight += $weight * $qty;   // This may be wrong if we mix different units
+            else {
+		if ($weight_units == 99) {
+			// conversion 1 Pound = 0.45359237 KG
+			$trueWeightUnit = 0.45359237;
+			$totalWeight += $weight * $qty * $trueWeightUnit;
+		} elseif ($weight_units == 98) {
+			// conversion 1 Ounce = 0.0283495 KG
+			$trueWeightUnit = 0.0283495;
+			$totalWeight += $weight * $qty * $trueWeightUnit;
+		}
+		else
+                	$totalWeight += $weight * $qty;   // This may be wrong if we mix different units
             }
             if ($volume_units < 50)   // >50 means a standard unit (power of 10 of official unit), > 50 means an exotic unit (like inch)
             {
diff --git a/htdocs/core/lib/product.lib.php b/htdocs/core/lib/product.lib.php
index 5aec64f3ce02ae797d58a2a6a18d8b347acad96c..7048b8570c6a78b55ee988b3c081a60daee47560 100644
--- a/htdocs/core/lib/product.lib.php
+++ b/htdocs/core/lib/product.lib.php
@@ -441,7 +441,8 @@ function measuring_units_string($unit,$measuring_style='')
 		$measuring_units[0] = $langs->transnoentitiesnoconv("WeightUnitkg");
 		$measuring_units[-3] = $langs->transnoentitiesnoconv("WeightUnitg");
 		$measuring_units[-6] = $langs->transnoentitiesnoconv("WeightUnitmg");
-        $measuring_units[99] = $langs->transnoentitiesnoconv("WeightUnitpound");
+		$measuring_units[98] = $langs->transnoentitiesnoconv("WeightUnitounce");
+		$measuring_units[99] = $langs->transnoentitiesnoconv("WeightUnitpound");
 	}
 	else if ($measuring_style == 'size')
 	{
diff --git a/htdocs/langs/en_US/other.lang b/htdocs/langs/en_US/other.lang
index b151614ce3cc55448fb9024aa35df06db666de71..e15d490c0f274e8d4a35751993b6f36b058f3d08 100644
--- a/htdocs/langs/en_US/other.lang
+++ b/htdocs/langs/en_US/other.lang
@@ -124,6 +124,7 @@ WeightUnitkg=kg
 WeightUnitg=g
 WeightUnitmg=mg
 WeightUnitpound=pound
+WeightUnitounce=ounce
 Length=Length
 LengthUnitm=m
 LengthUnitdm=dm
diff --git a/htdocs/product/class/html.formproduct.class.php b/htdocs/product/class/html.formproduct.class.php
index 01064c8ffa33bf213c1f43d5e438481d2067a6e6..1dbfbc7662f6506ba28e60f6f9255d4e7ee51ba8 100644
--- a/htdocs/product/class/html.formproduct.class.php
+++ b/htdocs/product/class/html.formproduct.class.php
@@ -307,7 +307,7 @@ class FormProduct
 		$return='';
 
 		$measuring_units=array();
-		if ($measuring_style == 'weight') $measuring_units=array(-6=>1,-3=>1,0=>1,3=>1,99=>1);
+		if ($measuring_style == 'weight') $measuring_units=array(-6=>1,-3=>1,0=>1,3=>1,98=>1,99=>1);
 		else if ($measuring_style == 'size') $measuring_units=array(-3=>1,-2=>1,-1=>1,0=>1,98=>1,99=>1);
         else if ($measuring_style == 'surface') $measuring_units=array(-6=>1,-4=>1,-2=>1,0=>1,98=>1,99=>1);
 		else if ($measuring_style == 'volume') $measuring_units=array(-9=>1,-6=>1,-3=>1,0=>1,88=>1,89=>1,97=>1,99=>1,/* 98=>1 */);  // Liter is not used as already available with dm3