diff --git a/src/classes/PRunAsymmetry.cpp b/src/classes/PRunAsymmetry.cpp
index 2dfad30a..c72133d4 100644
--- a/src/classes/PRunAsymmetry.cpp
+++ b/src/classes/PRunAsymmetry.cpp
@@ -1309,7 +1309,7 @@ Bool_t PRunAsymmetry::PrepareViewData(PRawRunData* runData, UInt_t histoNo[2])
   Int_t factor = 8; // 8 times more points for the theory (if fTheoAsData == false)
 
   fData.SetTheoryTimeStart(fData.GetDataTimeStart());
-  if (fTheoAsData) { // cacluate theory only at the data points
+  if (fTheoAsData) { // calculate theory only at the data points
     fData.SetTheoryTimeStep(fData.GetDataTimeStep());
   } else {
     // finer binning for the theory (8 times as many points = factor)
diff --git a/src/classes/PRunAsymmetryBNMR.cpp b/src/classes/PRunAsymmetryBNMR.cpp
index 7946717e..25c16101 100644
--- a/src/classes/PRunAsymmetryBNMR.cpp
+++ b/src/classes/PRunAsymmetryBNMR.cpp
@@ -1485,7 +1485,7 @@ Bool_t PRunAsymmetryBNMR::PrepareViewData(PRawRunData* runData, UInt_t histoNo[2
 
   Int_t factor = 8; // 8 times more points for the theory (if fTheoAsData == false)
   fData.SetTheoryTimeStart(fData.GetDataTimeStart());
-  if (fTheoAsData) { // cacluate theory only at the data points
+  if (fTheoAsData) { // calculate theory only at the data points
     fData.SetTheoryTimeStep(fData.GetDataTimeStep());
   } else {
     // finer binning for the theory (8 times as many points = factor)
diff --git a/src/classes/PRunAsymmetryRRF.cpp b/src/classes/PRunAsymmetryRRF.cpp
index 1d83808c..1fb478be 100644
--- a/src/classes/PRunAsymmetryRRF.cpp
+++ b/src/classes/PRunAsymmetryRRF.cpp
@@ -1224,7 +1224,7 @@ Bool_t PRunAsymmetryRRF::PrepareViewData(PRawRunData* runData, UInt_t histoNo[2]
   UInt_t size = runData->GetDataBin(histoNo[0])->size();
   Int_t factor = 8; // 8 times more points for the theory (if fTheoAsData == false)
   fData.SetTheoryTimeStart(fData.GetDataTimeStart());
-  if (fTheoAsData) { // cacluate theory only at the data points
+  if (fTheoAsData) { // calculate theory only at the data points
     fData.SetTheoryTimeStep(fData.GetDataTimeStep());
   } else {
     // finer binning for the theory (8 times as many points = factor)
diff --git a/src/classes/PRunMuMinus.cpp b/src/classes/PRunMuMinus.cpp
index 420143f3..07d00cf6 100644
--- a/src/classes/PRunMuMinus.cpp
+++ b/src/classes/PRunMuMinus.cpp
@@ -757,7 +757,7 @@ Bool_t PRunMuMinus::PrepareRawViewData(PRawRunData* runData, const UInt_t histoN
 
   Int_t factor = 8; // 8 times more points for the theory (if fTheoAsData == false)
   fData.SetTheoryTimeStart(fData.GetDataTimeStart());
-  if (fTheoAsData) { // cacluate theory only at the data points
+  if (fTheoAsData) { // calculate theory only at the data points
     fData.SetTheoryTimeStep(fData.GetDataTimeStep());
   } else {
     // finer binning for the theory (8 times as many points = factor)
diff --git a/src/classes/PRunSingleHisto.cpp b/src/classes/PRunSingleHisto.cpp
index 15ff4f1e..f0c4c6a8 100644
--- a/src/classes/PRunSingleHisto.cpp
+++ b/src/classes/PRunSingleHisto.cpp
@@ -1073,7 +1073,7 @@ Bool_t PRunSingleHisto::PrepareRawViewData(PRawRunData* runData, const UInt_t hi
   UInt_t size = fForward.size();
   Int_t factor = 8; // 8 times more points for the theory (if fTheoAsData == false)
   fData.SetTheoryTimeStart(fData.GetDataTimeStart());
-  if (fTheoAsData) { // cacluate theory only at the data points
+  if (fTheoAsData) { // calculate theory only at the data points
     fData.SetTheoryTimeStep(fData.GetDataTimeStep());
   } else {
     // finer binning for the theory (8 times as many points = factor)
@@ -1321,7 +1321,7 @@ Bool_t PRunSingleHisto::PrepareViewData(PRawRunData* runData, const UInt_t histo
 
   if (wRRF == 0) { // no RRF
     fData.SetTheoryTimeStart(fData.GetDataTimeStart());
-    if (fTheoAsData) { // cacluate theory only at the data points
+    if (fTheoAsData) { // calculate theory only at the data points
       fData.SetTheoryTimeStep(fData.GetDataTimeStep());
     } else {
       // finer binning for the theory (8 times as many points = factor)
diff --git a/src/classes/PRunSingleHistoRRF.cpp b/src/classes/PRunSingleHistoRRF.cpp
index 217d8883..00904b82 100644
--- a/src/classes/PRunSingleHistoRRF.cpp
+++ b/src/classes/PRunSingleHistoRRF.cpp
@@ -762,7 +762,7 @@ Bool_t PRunSingleHistoRRF::PrepareViewData(PRawRunData* runData, const UInt_t hi
   UInt_t size = fForward.size();
   Int_t factor = 8; // 8 times more points for the theory (if fTheoAsData == false)
   fData.SetTheoryTimeStart(fData.GetDataTimeStart());
-  if (fTheoAsData) { // cacluate theory only at the data points
+  if (fTheoAsData) { // calculate theory only at the data points
     fData.SetTheoryTimeStep(fData.GetDataTimeStep());
   } else {
     // finer binning for the theory (8 times as many points = factor)
diff --git a/src/musrgui/PTextEdit.cpp b/src/musrgui/PTextEdit.cpp
index 357d3791..f07d9e06 100644
--- a/src/musrgui/PTextEdit.cpp
+++ b/src/musrgui/PTextEdit.cpp
@@ -358,7 +358,7 @@ void PTextEdit::setupMusrActions()
   menu->insertSeparator();
   tb->addSeparator();
 
-  a = new QAction( QPixmap::fromMimeSource( "musrcalcchisq.xpm" ), tr( "Calculate Chisq" ), ALT + Key_C, this, "cacluates for the given parameters chiSq/maxLH" );
+  a = new QAction( QPixmap::fromMimeSource( "musrcalcchisq.xpm" ), tr( "Calculate Chisq" ), ALT + Key_C, this, "calculates for the given parameters chiSq/maxLH" );
   connect( a, SIGNAL( activated() ), this, SLOT( musrCalcChisq() ) );
   a->addTo( tb );
   a->addTo( menu );