diff --git a/qt-ui/preferences.cpp b/qt-ui/preferences.cpp
index 334b2a1d2..6c4e65df8 100644
--- a/qt-ui/preferences.cpp
+++ b/qt-ui/preferences.cpp
@@ -125,6 +125,8 @@ void PreferencesDialog::setUiFromPrefs()
 	ui.gf_low_at_maxdepth->setChecked(prefs.gf_low_at_maxdepth);
 	ui.show_ccr_setpoint->setChecked(prefs.show_ccr_setpoint);
 	ui.defaultSetpoint->setValue((double)prefs.defaultsetpoint / 1000.0);
+	ui.psro2rate->setValue(prefs.o2consumption / 1000.0);
+	ui.pscrfactor->setValue(rint(1000.0 / prefs.pscr_ratio));
 
 	// units
 	if (prefs.unit_system == METRIC)
@@ -299,7 +301,9 @@ void PreferencesDialog::syncSettings()
 	s.setValue("default_filename", ui.defaultfilename->text());
 	s.setValue("default_cylinder", ui.default_cylinder->currentText());
 	s.setValue("use_default_file", ui.btnUseDefaultFile->isChecked());
-	s.setValue("defaultsetpoint", (int) (ui.defaultSetpoint->value() * 1000.0));
+	s.setValue("defaultsetpoint", rint(ui.defaultSetpoint->value() * 1000.0));
+	s.setValue("o2consumption", rint(ui.psro2rate->value() *1000.0));
+	s.setValue("pscr_ratio", rint(1000.0 / ui.pscrfactor->value()));
 	s.endGroup();
 
 	s.beginGroup("Display");
@@ -397,7 +401,6 @@ void PreferencesDialog::loadSettings()
 	GET_BOOL("show_sac", show_sac);
 	GET_BOOL("display_unused_tanks", display_unused_tanks);
 	GET_BOOL("show_average_depth", show_average_depth);
-	GET_INT("default_setpoint", defaultsetpoint);
 	s.endGroup();
 
 	s.beginGroup("GeneralSettings");
@@ -405,6 +408,8 @@ void PreferencesDialog::loadSettings()
 	GET_TXT("default_cylinder", default_cylinder);
 	GET_BOOL("use_default_file", use_default_file);
 	GET_INT("defaultsetpoint", defaultsetpoint);
+	GET_INT("o2consumption", o2consumption);
+	GET_INT("pscr_ratio", pscr_ratio);
 	s.endGroup();
 
 	s.beginGroup("Display");
diff --git a/qt-ui/preferences.ui b/qt-ui/preferences.ui
index 2bcc684d7..77b3a25d1 100644
--- a/qt-ui/preferences.ui
+++ b/qt-ui/preferences.ui
@@ -151,7 +151,7 @@
         </sizepolicy>
        </property>
        <property name="currentIndex">
-        <number>5</number>
+        <number>2</number>
        </property>
        <widget class="QWidget" name="defaults_page">
         <layout class="QVBoxLayout" name="verticalLayout_3">
@@ -789,14 +789,14 @@
               </property>
              </widget>
             </item>
-            <item row="6" column="0">
+            <item row="7" column="0">
              <widget class="QLabel" name="label_26">
               <property name="text">
                <string>Default CCR set-point</string>
               </property>
              </widget>
             </item>
-            <item row="6" column="1">
+            <item row="7" column="1">
              <widget class="QDoubleSpinBox" name="defaultSetpoint">
               <property name="suffix">
                <string>bar</string>
@@ -819,6 +819,40 @@
               </property>
              </widget>
             </item>
+            <item row="8" column="0">
+             <widget class="QLabel" name="pSCR">
+              <property name="text">
+               <string>pSCR O₂ metabolism rate</string>
+              </property>
+             </widget>
+            </item>
+            <item row="9" column="0">
+             <widget class="QLabel" name="label_28">
+              <property name="text">
+               <string>pSCR ratio</string>
+              </property>
+             </widget>
+            </item>
+            <item row="8" column="1">
+             <widget class="QDoubleSpinBox" name="psro2rate">
+              <property name="suffix">
+               <string>ℓ/min</string>
+              </property>
+              <property name="decimals">
+               <number>3</number>
+              </property>
+             </widget>
+            </item>
+            <item row="9" column="1">
+             <widget class="QSpinBox" name="pscrfactor">
+              <property name="suffix">
+               <string/>
+              </property>
+              <property name="prefix">
+               <string>1:</string>
+              </property>
+             </widget>
+            </item>
            </layout>
           </widget>
          </item>
@@ -1400,10 +1434,10 @@
   </connection>
  </connections>
  <buttongroups>
-  <buttongroup name="buttonGroup"/>
   <buttongroup name="verticalSpeed"/>
   <buttongroup name="buttonGroup_2"/>
   <buttongroup name="buttonGroup_3"/>
+  <buttongroup name="buttonGroup"/>
   <buttongroup name="buttonGroup_4"/>
   <buttongroup name="buttonGroup_5"/>
   <buttongroup name="buttonGroup_6"/>