diff --git a/src/Gui/DlgUnitsCalculatorImp.cpp b/src/Gui/DlgUnitsCalculatorImp.cpp
index 2a84ae88d0..c365fc321c 100644
--- a/src/Gui/DlgUnitsCalculatorImp.cpp
+++ b/src/Gui/DlgUnitsCalculatorImp.cpp
@@ -113,15 +113,14 @@ void DlgUnitsCalculator::valueChanged(const Base::Quantity& quant)
 			ui->ValueOutput->setText(tr("unit mismatch"));
 			ui->pushButton_Copy->setEnabled(false);
 		} else { // the unit is valid and has the same type
-			Base::Quantity inputt = Base::Quantity(1.0, ui->UnitInput->text());
-			// this gives us e.g. for "1 in" the value '25.4' because 1 in = 25.4 mm
 			double convertValue = Base::Quantity::parse(QString::fromLatin1("1") + ui->UnitInput->text()).getValue();
-			// the result is now just input / convertValue because the imput is always in a base unit
-			// (an input of "1 cm" will immediately be converted to "10 mm" by Gui::InputField from the dialog)
+			// we got now e.g. for "1 in" the value '25.4' because 1 in = 25.4 mm
+			// the result is now just quant / convertValue because the input is always in a base unit
+			// (an input of "1 cm" will immediately be converted to "10 mm" by Gui::InputField of the dialog)
 			double value = quant.getValue() / convertValue;
 			// determine how many decimals we will need to avoid an output like "0.00"
-			// at first use scientific notation, if there is no "e", we can round it to the user-defined decimals
-			// the user-defined decimals might be too low for cases like "10 um" in "in",
+			// at first use scientific notation, if there is no "e", we can round it to the user-defined decimals,
+			// but the user-defined decimals might be too low for cases like "10 um" in "in",
 			// thus only if value > 0.005 because FC's default are 2 decimals
 			QString val = QLocale::system().toString(value, 'g');
 			if (!val.contains(QChar::fromLatin1('e')) && (value > 0.005))