diff --git a/src/Crisu83/Conversion/Quantity/Pressure/Pressure.php b/src/Crisu83/Conversion/Quantity/Pressure/Pressure.php
index 6b3dd9c..e626610 100644
--- a/src/Crisu83/Conversion/Quantity/Pressure/Pressure.php
+++ b/src/Crisu83/Conversion/Quantity/Pressure/Pressure.php
@@ -28,6 +28,7 @@ class Pressure extends Quantity
      */
     protected static $conversionMap = array(
         Unit::PASCAL                    => 1,
+        Unit::HECTOPASCAL               => 100,
         Unit::KILOPASCAL                => 1000,
         Unit::MEGAPASCAL                => 1e6,
         Unit::BAR                       => 1e5,
diff --git a/src/Crisu83/Conversion/Quantity/Pressure/Unit.php b/src/Crisu83/Conversion/Quantity/Pressure/Unit.php
index f09a101..e7d4412 100644
--- a/src/Crisu83/Conversion/Quantity/Pressure/Unit.php
+++ b/src/Crisu83/Conversion/Quantity/Pressure/Unit.php
@@ -19,6 +19,7 @@
 class Unit extends BaseUnit
 {
     const PASCAL                    = 'Pa';
+    const HECTOPASCAL               = 'hPa';
     const KILOPASCAL                = 'kPa';
     const MEGAPASCAL                = 'MPa';
     const BAR                       = 'bar';