diff --git a/opm/parser/eclipse/Units/UnitSystem.hpp b/opm/parser/eclipse/Units/UnitSystem.hpp
index abf3023e8..1f8fb83cd 100644
--- a/opm/parser/eclipse/Units/UnitSystem.hpp
+++ b/opm/parser/eclipse/Units/UnitSystem.hpp
@@ -110,6 +110,8 @@ namespace Opm {
 
         Dimension parse(const std::string& dimension) const;
 
+        double from_si( const std::string& dimension, double );
+        double to_si( const std::string& dimension, double );
         double from_si( measure, double ) const;
         double to_si( measure, double ) const;
         void from_si( measure, std::vector<double>& ) const;
diff --git a/src/opm/parser/eclipse/Units/UnitSystem.cpp b/src/opm/parser/eclipse/Units/UnitSystem.cpp
index 0f3810986..f9546dc55 100644
--- a/src/opm/parser/eclipse/Units/UnitSystem.cpp
+++ b/src/opm/parser/eclipse/Units/UnitSystem.cpp
@@ -1437,6 +1437,16 @@ namespace {
             + this->measure_table_to_si_offset[ static_cast< int >( m ) ];
     }
 
+    double UnitSystem::from_si( const std::string& dimension, double value) {
+        const auto& dim = this->parse(dimension);
+        return dim.convertSiToRaw(value);
+    }
+
+    double UnitSystem::to_si( const std::string& dimension, double value) {
+        const auto& dim = this->parse(dimension);
+        return dim.convertRawToSi(value);
+    }
+
     void UnitSystem::from_si( measure m, std::vector<double>& data ) const {
         double factor = this->measure_table_from_si[ static_cast< int >( m ) ];
         double offset = this->measure_table_to_si_offset[ static_cast< int >( m ) ];