diff --git a/src/app/tape/tmainwindow.cpp b/src/app/tape/tmainwindow.cpp
index be6675b85..7c4e21fa3 100644
--- a/src/app/tape/tmainwindow.cpp
+++ b/src/app/tape/tmainwindow.cpp
@@ -2171,8 +2171,8 @@ bool TMainWindow::EvalFormula(const QString &formula, bool fromUser, VContainer
                 f = formula;
             }
             f.replace("\n", " ");
-            Calculator *cal = new Calculator(data, mType);
-            const qreal result = UnitConvertor(cal->EvalFormula(f), mUnit, pUnit);
+            Calculator *cal = new Calculator();
+            const qreal result = UnitConvertor(cal->EvalFormula(data->PlainVariables(), f), mUnit, pUnit);
             delete cal;
 
             label->setText(qApp->LocaleToString(result) + " " +postfix);
diff --git a/src/app/valentina/dialogs/dialogincrements.cpp b/src/app/valentina/dialogs/dialogincrements.cpp
index 62f7cfda4..4d78026de 100644
--- a/src/app/valentina/dialogs/dialogincrements.cpp
+++ b/src/app/valentina/dialogs/dialogincrements.cpp
@@ -323,8 +323,8 @@ bool DialogIncrements::EvalIncrementFormula(const QString &formula, bool fromUse
                 f = formula;
             }
             f.replace("\n", " ");
-            Calculator *cal = new Calculator(data, qApp->patternType());
-            const qreal result = cal->EvalFormula(f);
+            Calculator *cal = new Calculator();
+            const qreal result = cal->EvalFormula(data->PlainVariables(), f);
             delete cal;
 
             label->setText(qApp->LocaleToString(result) + " " + postfix);
diff --git a/src/app/valentina/xml/vpattern.cpp b/src/app/valentina/xml/vpattern.cpp
index a5483e17d..8da18b930 100644
--- a/src/app/valentina/xml/vpattern.cpp
+++ b/src/app/valentina/xml/vpattern.cpp
@@ -2043,8 +2043,8 @@ qreal VPattern::EvalFormula(VContainer *data, const QString &formula, bool *ok)
             // Replace line return character with spaces for calc if exist
             QString f = formula;
             f.replace("\n", " ");
-            Calculator *cal = new Calculator(data, qApp->patternType());
-            const qreal result = cal->EvalFormula(f);
+            Calculator *cal = new Calculator();
+            const qreal result = cal->EvalFormula(data->PlainVariables(), f);
             delete cal;
 
             *ok = true;
diff --git a/src/libs/vformat/vmeasurements.cpp b/src/libs/vformat/vmeasurements.cpp
index 6f8405fd8..efe575e4b 100644
--- a/src/libs/vformat/vmeasurements.cpp
+++ b/src/libs/vformat/vmeasurements.cpp
@@ -829,8 +829,8 @@ qreal VMeasurements::EvalFormula(VContainer *data, const QString &formula, bool
             // Replace line return character with spaces for calc if exist
             QString f = formula;
             f.replace("\n", " ");
-            Calculator *cal = new Calculator(data, type);
-            const qreal result = cal->EvalFormula(f);
+            Calculator *cal = new Calculator();
+            const qreal result = cal->EvalFormula(data->PlainVariables(), f);
             delete cal;
 
             *ok = true;
diff --git a/src/libs/vpatterndb/calculator.cpp b/src/libs/vpatterndb/calculator.cpp
index 1a4bd0453..382a6bb97 100644
--- a/src/libs/vpatterndb/calculator.cpp
+++ b/src/libs/vpatterndb/calculator.cpp
@@ -43,15 +43,14 @@ using namespace qmu;
  *
  * const QString formula = qApp->FormulaFromUser(edit->text());
  * Calculator *cal = new Calculator(data, patternType);
- * const qreal result = cal->EvalFormula(formula);
+ * const qreal result = cal->EvalFormula(data->PlainVariables(), formula);
  * delete cal;
  *
  * @param data pointer to a variable container.
  */
-Calculator::Calculator(const VContainer *data, MeasurementsType patternType)
-    :QmuFormulaBase(), vVarVal(nullptr), data(data), patternType(patternType)
+Calculator::Calculator()
+    :QmuFormulaBase()
 {
-    SCASSERT(data != nullptr)
     InitCharacterSets();
     setAllowSubexpressions(false);//Only one expression per time
 
@@ -61,7 +60,6 @@ Calculator::Calculator(const VContainer *data, MeasurementsType patternType)
 //---------------------------------------------------------------------------------------------------------------------
 Calculator::~Calculator()
 {
-    delete [] vVarVal;
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -74,7 +72,7 @@ Calculator::~Calculator()
  * @param formula string of formula.
  * @return value of formula.
  */
-qreal Calculator::EvalFormula(const QString &formula)
+qreal Calculator::EvalFormula(const QHash<QString, qreal *> &vars, const QString &formula)
 {
     // Parser doesn't know any variable on this stage. So, we just use variable factory that for each unknown variable
     // set value to 0.
@@ -106,7 +104,7 @@ qreal Calculator::EvalFormula(const QString &formula)
     }
 
     // Add variables to parser because we have deal with expression with variables.
-    InitVariables(data, tokens, formula);
+    InitVariables(vars, tokens, formula);
     return Eval();
 }
 
@@ -116,51 +114,26 @@ qreal Calculator::EvalFormula(const QString &formula)
  *
  * For optimization purpose we try don't add variables that we don't need.
  *
- * @param data pointer to a variable container. Hold all informations about variables.
+ * @param vars list of variables.
  * @param tokens all tokens (measurements names, variables with lengths) that parser have found in expression.
  * @param formula expression, need for throwing better error message.
  */
-void Calculator::InitVariables(const VContainer *data, const QMap<int, QString> &tokens, const QString &formula)
+void Calculator::InitVariables(const QHash<QString, qreal *> &vars, const QMap<int, QString> &tokens,
+                               const QString &formula)
 {
-    if (patternType == MeasurementsType::Standard)
-    {
-        vVarVal = new qreal[2]; //stabdard measurements table have two additional variables
-    }
-
-    SCASSERT(data != nullptr)
-    const QHash<QString, QSharedPointer<VInternalVariable> > *vars = data->DataVariables();
-
     QMap<int, QString>::const_iterator i = tokens.constBegin();
     while (i != tokens.constEnd())
     {
         bool found = false;
-        if (vars->contains(i.value()))
+        if (vars.contains(i.value()))
         {
-            QSharedPointer<VInternalVariable> var = vars->value(i.value());
-            if (patternType == MeasurementsType::Standard && var->GetType() == VarType::Measurement)
-            {
-                QSharedPointer<VVariable> m = data->GetVariable<VVariable>(i.value());
-                m->SetValue(data->size(), data->height(), *data->GetPatternUnit());
-            }
-            DefineVar(i.value(), var->GetValue());
+            DefineVar(i.value(), vars.value(i.value()));
             found = true;
         }
 
-        if (patternType == MeasurementsType::Standard)
-        {
-            if (i.value() == data->SizeName())
-            {
-                vVarVal[0] = data->size();
-                DefineVar(data->SizeName(), &vVarVal[0]);
-                found = true;
-            }
-
-            if (i.value() == data->HeightName())
-            {
-                vVarVal[1] = data->height();
-                DefineVar(data->HeightName(), &vVarVal[1]);
-                found = true;
-            }
+        if (found == false && builInFunctions.contains(i.value()))
+        {// We have found built-in function
+            found = true;
         }
 
         if (found == false)
diff --git a/src/libs/vpatterndb/calculator.h b/src/libs/vpatterndb/calculator.h
index e68271805..c6f2e03c2 100644
--- a/src/libs/vpatterndb/calculator.h
+++ b/src/libs/vpatterndb/calculator.h
@@ -48,23 +48,21 @@ class VContainer;
  *     //Need delete dialog here because parser in dialog don't allow use correct separator for parsing here.
  *     //Don't know why.
  *     delete dialog;
- *     Calculator *cal = new Calculator(data);
- *     result = cal->EvalFormula(formula);
+ *     Calculator *cal = new Calculator();
+ *     result = cal->EvalFormula(data->PlainVariables(), formula);
  *     delete cal;//Here can be memory leak, but dialog already check this formula and probability very low.
  * }
  */
 class Calculator:public qmu::QmuFormulaBase
 {
 public:
-    Calculator(const VContainer *data, MeasurementsType patternType);
+    Calculator();
     virtual ~Calculator();
-    qreal         EvalFormula(const QString &formula);
+    qreal         EvalFormula(const QHash<QString, qreal *> &vars, const QString &formula);
 private:
     Q_DISABLE_COPY(Calculator)
-    qreal *vVarVal;
-    const VContainer *data;
-    MeasurementsType patternType;
-    void          InitVariables(const VContainer *data, const QMap<int, QString> &tokens, const QString &formula);
+    void          InitVariables(const QHash<QString, qreal *> &vars, const QMap<int, QString> &tokens,
+                                const QString &formula);
     static void   RemoveAll(QMap<int, QString> &map, const QString &val);
 };
 
diff --git a/src/libs/vpatterndb/vcontainer.cpp b/src/libs/vpatterndb/vcontainer.cpp
index 9a8338e8d..bb45c86fb 100644
--- a/src/libs/vpatterndb/vcontainer.cpp
+++ b/src/libs/vpatterndb/vcontainer.cpp
@@ -489,9 +489,9 @@ const QMap<QString, QSharedPointer<VSplineAngle> > VContainer::DataAnglesCurves(
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-const QHash<QString, const qreal *> VContainer::PlainVariables() const
+const QHash<QString, qreal *> VContainer::PlainVariables() const
 {
-    QHash<QString, const qreal *> vars;
+    QHash<QString, qreal *> vars;
 
     QHash<QString, QSharedPointer<VInternalVariable>>::const_iterator i = d->variables.constBegin();
     while (i != d->variables.constEnd())
@@ -504,6 +504,8 @@ const QHash<QString, const qreal *> VContainer::PlainVariables() const
             m->SetValue(size(), height(), qApp->patternUnit());
         }
         vars.insert(i.key(), var->GetValue());
+
+        ++i;
     }
 
     if (qApp->patternType() == MeasurementsType::Standard)
@@ -619,7 +621,7 @@ qreal VContainer::size()
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-const qreal *VContainer::rsize()
+qreal *VContainer::rsize()
 {
     return &_size;
 }
@@ -641,7 +643,7 @@ qreal VContainer::height()
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-const qreal *VContainer::rheight()
+qreal *VContainer::rheight()
 {
     return &_height;
 }
diff --git a/src/libs/vpatterndb/vcontainer.h b/src/libs/vpatterndb/vcontainer.h
index ee56467f3..13d5fa631 100644
--- a/src/libs/vpatterndb/vcontainer.h
+++ b/src/libs/vpatterndb/vcontainer.h
@@ -138,10 +138,10 @@ public:
     static void        SetHeight(qreal height);
     void               SetHeightName(const QString &name);
     static qreal       size();
-    static const qreal *rsize();
+    static qreal      *rsize();
     QString            SizeName() const;
     static qreal       height();
-    static const qreal *rheight();
+    static qreal      *rheight();
     QString            HeightName()const;
 
     bool               VariableExist(const QString& name);
@@ -162,7 +162,7 @@ public:
     const QMap<QString, QSharedPointer<VArcAngle> >     DataAnglesArcs() const;
     const QMap<QString, QSharedPointer<VSplineAngle> >  DataAnglesCurves() const;
 
-    const QHash<QString, const qreal *> PlainVariables() const;
+    const QHash<QString, qreal *> PlainVariables() const;
 
     static bool        IsUnique(const QString &name);
 
diff --git a/src/libs/vpatterndb/vformula.cpp b/src/libs/vpatterndb/vformula.cpp
index 70b3caab3..94f54e73a 100644
--- a/src/libs/vpatterndb/vformula.cpp
+++ b/src/libs/vpatterndb/vformula.cpp
@@ -226,9 +226,9 @@ void VFormula::Eval()
     {
         try
         {
-            Calculator *cal = new Calculator(data, qApp->patternType());
+            Calculator *cal = new Calculator();
             QString expression = qApp->TrVars()->FormulaFromUser(formula, qApp->Settings()->GetOsSeparator());
-            const qreal result = cal->EvalFormula(expression);
+            const qreal result = cal->EvalFormula(data->PlainVariables(), expression);
             delete cal;
 
             //if result equal 0
diff --git a/src/libs/vtools/dialogs/tools/dialogtool.cpp b/src/libs/vtools/dialogs/tools/dialogtool.cpp
index 682c5dc1e..cf0e6306d 100644
--- a/src/libs/vtools/dialogs/tools/dialogtool.cpp
+++ b/src/libs/vtools/dialogs/tools/dialogtool.cpp
@@ -364,8 +364,8 @@ qreal DialogTool::Eval(const QString &text, bool &flag, QLabel *label, const QSt
             formula.replace("\n", " ");
             // Translate to internal look.
             formula = qApp->TrVars()->FormulaFromUser(formula, qApp->Settings()->GetOsSeparator());
-            Calculator *cal = new Calculator(data, qApp->patternType());
-            result = cal->EvalFormula(formula);
+            Calculator *cal = new Calculator();
+            result = cal->EvalFormula(data->PlainVariables(), formula);
             delete cal;
 
             //if result equal 0
diff --git a/src/libs/vtools/tools/drawTools/vdrawtool.cpp b/src/libs/vtools/tools/drawTools/vdrawtool.cpp
index a8c9ab8cf..c88291b41 100644
--- a/src/libs/vtools/tools/drawTools/vdrawtool.cpp
+++ b/src/libs/vtools/tools/drawTools/vdrawtool.cpp
@@ -285,8 +285,8 @@ qreal VDrawTool::CheckFormula(const quint32 &toolId, QString &formula, VContaine
     Calculator *cal = nullptr;
     try
     {
-        cal = new Calculator(data, qApp->patternType());
-        result = cal->EvalFormula(formula);
+        cal = new Calculator();
+        result = cal->EvalFormula(data->PlainVariables(), formula);
         delete cal;
     }
     catch (qmu::QmuParserError &e)
@@ -316,8 +316,8 @@ qreal VDrawTool::CheckFormula(const quint32 &toolId, QString &formula, VContaine
                         /* Need delete dialog here because parser in dialog don't allow use correct separator for
                          * parsing here. */
                         delete dialog;
-                        Calculator *cal1 = new Calculator(data, qApp->patternType());
-                        result = cal1->EvalFormula(formula);
+                        Calculator *cal1 = new Calculator();
+                        result = cal1->EvalFormula(data->PlainVariables(), formula);
                         delete cal1; /* Here can be memory leak, but dialog already check this formula and probability
                                       * very low. */
                         break;
diff --git a/src/libs/vtools/visualization/visualization.cpp b/src/libs/vtools/visualization/visualization.cpp
index 8fb348453..1c11267ad 100644
--- a/src/libs/vtools/visualization/visualization.cpp
+++ b/src/libs/vtools/visualization/visualization.cpp
@@ -147,8 +147,8 @@ qreal Visualization::FindVal(const QString &expression)
             QString formula = expression;
             formula.replace("\n", " ");
             formula = qApp->TrVars()->FormulaFromUser(formula, qApp->Settings()->GetOsSeparator());
-            Calculator *cal = new Calculator(Visualization::data, qApp->patternType());
-            val = cal->EvalFormula(formula);
+            Calculator *cal = new Calculator();
+            val = cal->EvalFormula(data->PlainVariables(), formula);
             delete cal;
         }
         catch (qmu::QmuParserError &e)