diff --git a/backend-shared/plannershared.cpp b/backend-shared/plannershared.cpp
index 542f1aae1..b39aa556c 100644
--- a/backend-shared/plannershared.cpp
+++ b/backend-shared/plannershared.cpp
@@ -105,10 +105,18 @@ void plannerShared::set_decosac(double value)
 
 double plannerShared::sacfactor()
 {
-	return qPrefDivePlanner::sacfactor() / 100.0;
+	return qPrefDivePlanner::sacfactor() /
+#ifdef SUBSURFACE_MOBILE
+			10.0;
+#else
+			100.0;
+#endif
 }
 void plannerShared::set_sacfactor(double value)
 {
+#ifdef SUBSURFACE_MOBILE
+	value /= 10.0;
+#endif
 	// NO conversion, this is done in the planner model.
 	DivePlannerPointsModel::instance()->setSacFactor(value);
 }
diff --git a/mobile-widgets/qml/DivePlannerSetup.qml b/mobile-widgets/qml/DivePlannerSetup.qml
index 2c04d4695..a0c4a3176 100644
--- a/mobile-widgets/qml/DivePlannerSetup.qml
+++ b/mobile-widgets/qml/DivePlannerSetup.qml
@@ -261,15 +261,15 @@ Kirigami.ScrollablePage {
 					text: qsTr("SAC factor")
 				}
 				TemplateSpinBox {
-					from: 20
+					from: 10
 					to: 99
 					stepSize: 1
-					value: Planner.sacfactor
+					value: Backend.sacfactor
 					textFromValue: function (value, locale) {
 						return (value / 10).toFixed(1)
 					}
 					onValueModified: {
-						Planner.sacfactor = value
+						Backend.sacfactor = value
 					}
 				}
 				TemplateLabel {
diff --git a/mobile-widgets/qmlinterface.cpp b/mobile-widgets/qmlinterface.cpp
index 99dc54f2f..21ab50494 100644
--- a/mobile-widgets/qmlinterface.cpp
+++ b/mobile-widgets/qmlinterface.cpp
@@ -69,6 +69,9 @@ void QMLInterface::setup(QQmlContext *ct)
 			instance(), &QMLInterface::bottomsacChanged);
 	connect(qPrefDivePlanner::instance(), &qPrefDivePlanner::decosacChanged,
 			instance(), &QMLInterface::decosacChanged);
+	connect(qPrefDivePlanner::instance(), &qPrefDivePlanner::sacfactorChanged,
+			instance(), &QMLInterface::sacfactorChanged);
+
 	connect(qPrefDivePlanner::instance(), &qPrefDivePlanner::display_runtimeChanged,
 			instance(), &QMLInterface::display_runtimeChanged);
 	connect(qPrefDivePlanner::instance(), &qPrefDivePlanner::display_durationChanged,
diff --git a/tests/testplannershared.cpp b/tests/testplannershared.cpp
index f2655432c..da4de48fb 100644
--- a/tests/testplannershared.cpp
+++ b/tests/testplannershared.cpp
@@ -79,13 +79,13 @@ void TestPlannerShared::test_gas()
 {
 	// test independent of metric/imperial
 	plannerShared::set_sacfactor(4.2);
-	QCOMPARE(qPrefDivePlanner::sacfactor(), 420);
+	QCOMPARE(qPrefDivePlanner::sacfactor(), 42);
 	plannerShared::set_sacfactor(3.5);
-	QCOMPARE(qPrefDivePlanner::sacfactor(), 350);
+	QCOMPARE(qPrefDivePlanner::sacfactor(), 35);
 	qPrefDivePlanner::set_sacfactor(280);
-	QCOMPARE(plannerShared::sacfactor(), 2.8);
+	QCOMPARE(plannerShared::sacfactor(), 28);
 	qPrefDivePlanner::set_sacfactor(200);
-	QCOMPARE(plannerShared::sacfactor(), 2.0);
+	QCOMPARE(plannerShared::sacfactor(), 20);
 
 	// Set system to use meters
 	qPrefUnits::set_unit_system(METRIC);
@@ -139,26 +139,26 @@ void TestPlannerShared::test_gas()
 	qPrefUnits::set_unit_system(IMPERIAL);
 
 	plannerShared::set_bottomsac(0.9);
-	QCOMPARE(qPrefDivePlanner::bottomsac(), 25485);
+	QCOMPARE(qPrefDivePlanner::bottomsac(), 255);
 	plannerShared::set_bottomsac(0.01);
-	QCOMPARE(qPrefDivePlanner::bottomsac(), 283);
+	QCOMPARE(qPrefDivePlanner::bottomsac(), 3);
 
 	// Remark return will from qPref is in m / 1000.
 	qPrefDivePlanner::set_bottomsac(2830);
-	QCOMPARE(int(plannerShared::bottomsac() * 1000), 99);
+	QCOMPARE(int(plannerShared::bottomsac()), 9);
 	qPrefDivePlanner::set_bottomsac(16000);
-	QCOMPARE(int(plannerShared::bottomsac() * 1000), 565);
+	QCOMPARE(int(plannerShared::bottomsac()), 56);
 
 	plannerShared::set_decosac(0.9);
-	QCOMPARE(qPrefDivePlanner::decosac(), 25485);
+	QCOMPARE(qPrefDivePlanner::decosac(), 255);
 	plannerShared::set_decosac(0.01);
-	QCOMPARE(qPrefDivePlanner::decosac(), 283);
+	QCOMPARE(qPrefDivePlanner::decosac(), 3);
 
 	// Remark return will from qPref is in m / 1000.
 	qPrefDivePlanner::set_decosac(11500);
-	QCOMPARE(int(plannerShared::decosac() * 1000), 406);
+	QCOMPARE(int(plannerShared::decosac()), 40);
 	qPrefDivePlanner::set_decosac(19800);
-	QCOMPARE(int(plannerShared::decosac() * 1000), 699);
+	QCOMPARE(int(plannerShared::decosac()), 69);
 
 	// Remark bottompo2 is in BAR, even though unit system is
 	// Imperial, the desktop version is like that.