diff --git a/opm/parser/eclipse/Units/UnitSystem.cpp b/opm/parser/eclipse/Units/UnitSystem.cpp
index da3d61d26..8fd429a62 100644
--- a/opm/parser/eclipse/Units/UnitSystem.cpp
+++ b/opm/parser/eclipse/Units/UnitSystem.cpp
@@ -447,6 +447,21 @@ namespace {
         return this->measure_table_to_si[ static_cast< int >( m ) ] * val;
     }
 
+    void UnitSystem::from_si( measure m, std::vector<double>& data ) const {
+        double factor = this->measure_table_from_si[ static_cast< int >( m ) ];
+        auto scale = [=](double x) { return x * factor; };
+        std::transform( data.begin() , data.end() , data.begin() , scale);
+    }
+
+
+    void UnitSystem::to_si( measure m, std::vector<double>& data) const {
+        double factor = this->measure_table_to_si[ static_cast< int >( m ) ];
+        auto scale = [=](double x) { return x * factor; };
+        std::transform( data.begin() , data.end() , data.begin() , scale);
+    }
+
+
+
     const char* UnitSystem::name( measure m ) const {
         return this->unit_name_table[ static_cast< int >( m ) ];
     }
diff --git a/opm/parser/eclipse/Units/UnitSystem.hpp b/opm/parser/eclipse/Units/UnitSystem.hpp
index 1521a1953..d22e6f3be 100644
--- a/opm/parser/eclipse/Units/UnitSystem.hpp
+++ b/opm/parser/eclipse/Units/UnitSystem.hpp
@@ -22,6 +22,7 @@
 
 #include <string>
 #include <map>
+#include <vector>
 #include <memory>
 
 namespace Opm {
@@ -81,6 +82,8 @@ namespace Opm {
 
         double from_si( measure, double ) const;
         double to_si( measure, double ) const;
+        void from_si( measure, std::vector<double>& ) const;
+        void to_si( measure, std::vector<double>& ) const;
         const char* name( measure ) const;
 
         static UnitSystem * newMETRIC();
diff --git a/opm/parser/eclipse/Units/tests/UnitTests.cpp b/opm/parser/eclipse/Units/tests/UnitTests.cpp
index d3184f3ec..4cf311dd2 100644
--- a/opm/parser/eclipse/Units/tests/UnitTests.cpp
+++ b/opm/parser/eclipse/Units/tests/UnitTests.cpp
@@ -213,3 +213,16 @@ BOOST_AUTO_TEST_CASE(LabUnitConversions) {
         BOOST_CHECK_CLOSE( 1.0 , lab->from_si( q.m , q.f ) , 1.0e-10 );
     }
 }
+
+
+BOOST_AUTO_TEST_CASE( VectorConvert ) {
+    std::vector<double> d0 = {1,2,3};
+    std::vector<double> d1 = {1,2,3};
+    UnitSystem * units = UnitSystem::newLAB();
+
+    units->from_si( UnitSystem::measure::pressure , d0 );
+    for (size_t i = 0; i < d1.size(); i++)
+        BOOST_CHECK_EQUAL( units->from_si( UnitSystem::measure::pressure , d1[i] ) , d0[i]);
+
+    delete units;
+}