diff --git a/src/app/dialogs/tools/dialogendline.cpp b/src/app/dialogs/tools/dialogendline.cpp
index b9b1b4279..cdc6aad14 100644
--- a/src/app/dialogs/tools/dialogendline.cpp
+++ b/src/app/dialogs/tools/dialogendline.cpp
@@ -39,10 +39,13 @@ DialogEndLine::DialogEndLine(const VContainer *data, QWidget *parent)
     ui->setupUi(this);
     InitVariables(ui);
     labelResultCalculation = ui->labelResultCalculation;
-    lineEditFormula = ui->lineEditFormula;
+    plainTextEditFormula = ui->plainTextEditFormula;
     labelEditFormula = ui->labelEditFormula;
     labelEditNamePoint = ui->labelEditNamePoint;
 
+    // TODO : auto extend height on first value length.
+    this->formulaBaseHeight=ui->plainTextEditFormula->height();
+
     InitOkCansel(ui);
     flagFormula = false;
     flagName = false;
@@ -57,7 +60,29 @@ DialogEndLine::DialogEndLine(const VContainer *data, QWidget *parent)
     connect(ui->listWidget, &QListWidget::itemDoubleClicked, this, &DialogEndLine::PutVal);
     connect(ui->toolButtonEqual, &QPushButton::clicked, this, &DialogEndLine::EvalFormula);
     connect(ui->lineEditNamePoint, &QLineEdit::textChanged, this, &DialogEndLine::NamePointChanged);
-    connect(ui->lineEditFormula, &QLineEdit::textChanged, this, &DialogEndLine::FormulaChanged);
+    connect(ui->plainTextEditFormula, &QPlainTextEdit::textChanged, this, &DialogEndLine::FormulaTextChanged);
+    connect(ui->pushButtonGrowLength, &QPushButton::clicked, this, &DialogEndLine::DeployFormulaTextEdit);
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+void DialogEndLine::FormulaTextChanged()
+{
+    // TODO issue #79 :  back to FormulaChanged when full update
+    // Also remove this function if only one function called here
+    this->FormulaChanged2();
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+void DialogEndLine::DeployFormulaTextEdit()
+{
+    if (ui->plainTextEditFormula->height() < 64)
+    {
+        ui->plainTextEditFormula->setFixedHeight(64);
+    }
+    else
+    {
+       ui->plainTextEditFormula->setFixedHeight(this->formulaBaseHeight);
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -90,7 +115,10 @@ void DialogEndLine::setTypeLine(const QString &value)
 void DialogEndLine::setFormula(const QString &value)
 {
     formula = value;
-    ui->lineEditFormula->setText(formula);
+    ui->plainTextEditFormula->setPlainText(value);
+    //QTextCursor cursor = ui->plainTextEditFormula->textCursor();
+    //cursor.insertText(value);
+    //ui->plainTextEditFormula->setCursor(cursor);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -111,7 +139,7 @@ void DialogEndLine::DialogAccepted()
 {
     pointName = ui->lineEditNamePoint->text();
     typeLine = GetTypeLine(ui->comboBoxLineType);
-    formula = ui->lineEditFormula->text();
+    formula = ui->plainTextEditFormula->toPlainText();
     angle = ui->doubleSpinBoxAngle->value();
     basePointId = getCurrentObjectId(ui->comboBoxBasePoint);
     emit DialogClosed(QDialog::Accepted);
diff --git a/src/app/dialogs/tools/dialogendline.h b/src/app/dialogs/tools/dialogendline.h
index 7dfc82b03..9765d6cbb 100644
--- a/src/app/dialogs/tools/dialogendline.h
+++ b/src/app/dialogs/tools/dialogendline.h
@@ -112,6 +112,14 @@ public slots:
      * @brief DialogAccepted save data and emit signal about closed dialog.
      */
     virtual void      DialogAccepted();
+    /**
+     * @brief DeployFormulaTextEdit grow or shrink formula input
+     */
+    void DeployFormulaTextEdit();
+    /**
+     * @brief FormulaTextChanged when formula text changes for validation and calc
+     */
+    void FormulaTextChanged();
 private:
     Q_DISABLE_COPY(DialogEndLine)
     /**
@@ -138,6 +146,10 @@ private:
      * @brief basePointId id base point of line
      */
     quint32            basePointId;
+    /**
+     * @brief formulaBaseHeight base height defined by dialogui
+     */
+    int formulaBaseHeight;
 };
 
 inline QString DialogEndLine::getPointName() const
diff --git a/src/app/dialogs/tools/dialogendline.ui b/src/app/dialogs/tools/dialogendline.ui
index 1d6c59866..797078a5a 100644
--- a/src/app/dialogs/tools/dialogendline.ui
+++ b/src/app/dialogs/tools/dialogendline.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>539</width>
-    <height>559</height>
+    <width>486</width>
+    <height>522</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -74,17 +74,17 @@
       </widget>
      </item>
      <item>
-      <widget class="QLineEdit" name="lineEditFormula">
-       <property name="sizePolicy">
-        <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
-         <horstretch>0</horstretch>
-         <verstretch>0</verstretch>
-        </sizepolicy>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
        </property>
-       <property name="toolTip">
-        <string>Formula for calculation of length of line</string>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
        </property>
-      </widget>
+      </spacer>
      </item>
      <item>
       <widget class="QToolButton" name="toolButtonPutHere">
@@ -147,6 +147,56 @@
      </item>
     </layout>
    </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_8">
+     <item>
+      <widget class="QPlainTextEdit" name="plainTextEditFormula">
+       <property name="maximumSize">
+        <size>
+         <width>16777215</width>
+         <height>24</height>
+        </size>
+       </property>
+       <property name="baseSize">
+        <size>
+         <width>4</width>
+         <height>0</height>
+        </size>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="pushButtonGrowLength">
+       <property name="maximumSize">
+        <size>
+         <width>16</width>
+         <height>16</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Show full calculation in message box&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+       <property name="icon">
+        <iconset resource="../../share/resources/icon.qrc">
+         <normaloff>:/icon/16x16/go-down.png</normaloff>
+         <activeoff>:/icon/16x16/go-next.png</activeoff>:/icon/16x16/go-down.png</iconset>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>16</width>
+         <height>16</height>
+        </size>
+       </property>
+       <property name="flat">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout_2">
      <item>
@@ -550,7 +600,6 @@
   </layout>
  </widget>
  <tabstops>
-  <tabstop>lineEditFormula</tabstop>
   <tabstop>comboBoxBasePoint</tabstop>
   <tabstop>lineEditNamePoint</tabstop>
   <tabstop>doubleSpinBoxAngle</tabstop>
diff --git a/src/app/dialogs/tools/dialogtool.cpp b/src/app/dialogs/tools/dialogtool.cpp
index c10df30c0..ada3d1e16 100644
--- a/src/app/dialogs/tools/dialogtool.cpp
+++ b/src/app/dialogs/tools/dialogtool.cpp
@@ -33,10 +33,15 @@
 
 #include <QtWidgets>
 
+// TODO : for issue #79
+// replace lineEditFormula -> plainTextEditFormula
+// delete lineEditFormala everywhrer
+// delete PutValHere and eval overloaded functions
+
 //---------------------------------------------------------------------------------------------------------------------
 DialogTool::DialogTool(const VContainer *data, QWidget *parent)
     :QDialog(parent), data(data), isInitialized(false), flagName(true), flagFormula(true), timerFormula(nullptr),
-      bOk(nullptr), spinBoxAngle(nullptr), lineEditFormula(nullptr), listWidget(nullptr),
+      bOk(nullptr), spinBoxAngle(nullptr), lineEditFormula(nullptr), plainTextEditFormula(nullptr), listWidget(nullptr),
       labelResultCalculation(nullptr), labelDescription(nullptr), labelEditNamePoint(nullptr),
       labelEditFormula(nullptr), radioButtonSizeGrowth(nullptr), radioButtonStandardTable(nullptr),
       radioButtonIncrements(nullptr), radioButtonLengthLine(nullptr), radioButtonLengthArc(nullptr),
@@ -283,22 +288,42 @@ void DialogTool::ChangeCurrentData(QComboBox *box, const quint32 &value) const
     }
 }
 
-//---------------------------------------------------------------------------------------------------------------------
 void DialogTool::PutValHere(QLineEdit *lineEdit, QListWidget *listWidget)
-{
+{   // TODO issue #79 : erase this function after all tools updated to plainTextEdit
     Q_CHECK_PTR(lineEdit);
     Q_CHECK_PTR(listWidget);
     QListWidgetItem *item = listWidget->currentItem();
     Q_CHECK_PTR(item);
+
     int pos = lineEdit->cursorPosition();
     lineEdit->setText(lineEdit->text().insert(lineEdit->cursorPosition(), item->text()));
     lineEdit->setFocus();
     lineEdit->setCursorPosition(pos + item->text().size());
+
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+void DialogTool::PutValHere(QPlainTextEdit *plainTextEdit, QListWidget *listWidget)
+{
+    Q_CHECK_PTR(plainTextEdit);
+    Q_CHECK_PTR(listWidget);
+    QListWidgetItem *item = listWidget->currentItem();
+    Q_CHECK_PTR(item);
+
+    QTextCursor cursor = plainTextEdit->textCursor();
+    cursor.insertText(item->text());
+    plainTextEdit->setTextCursor(cursor);
+    /*
+    int pos = lineEdit->cursorPosition();
+    lineEdit->setText(lineEdit->text().insert(lineEdit->cursorPosition(), item->text()));
+    lineEdit->setFocus();
+    lineEdit->setCursorPosition(pos + item->text().size());
+    */
 }
 
 //---------------------------------------------------------------------------------------------------------------------
 void DialogTool::ValFormulaChanged(bool &flag, QLineEdit *edit, QTimer *timer)
-{
+{// TODO issue #79 : erase this function after all tools updated to plainTextEdit
     Q_CHECK_PTR(edit);
     Q_CHECK_PTR(timer);
     Q_CHECK_PTR(labelEditFormula);
@@ -313,10 +338,26 @@ void DialogTool::ValFormulaChanged(bool &flag, QLineEdit *edit, QTimer *timer)
     }
     timer->start(1000);
 }
-
 //---------------------------------------------------------------------------------------------------------------------
-void DialogTool::Eval(QLineEdit *edit, bool &flag, QTimer *timer, QLabel *label)
+void DialogTool::ValFormulaChanged(bool &flag, QPlainTextEdit *edit, QTimer *timer)
 {
+    Q_CHECK_PTR(edit);
+    Q_CHECK_PTR(timer);
+    Q_CHECK_PTR(labelEditFormula);
+    if (edit->toPlainText().isEmpty())
+    {
+        flag = false;
+        CheckState();
+        QPalette palette = labelEditFormula->palette();
+        palette.setColor(labelEditFormula->foregroundRole(), Qt::red);
+        labelEditFormula->setPalette(palette);
+        return;
+    }
+    timer->start(1000);
+}
+
+void DialogTool::Eval(QLineEdit *edit, bool &flag, QTimer *timer, QLabel *label)
+{  // TODO issue #79 : erase this function after all tools updated to plainTextEdit
     Q_CHECK_PTR(edit);
     Q_CHECK_PTR(timer);
     Q_CHECK_PTR(label);
@@ -350,6 +391,45 @@ void DialogTool::Eval(QLineEdit *edit, bool &flag, QTimer *timer, QLabel *label)
     labelEditFormula->setPalette(palette);
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+void DialogTool::Eval(QPlainTextEdit *edit, bool &flag, QTimer *timer, QLabel *label)
+{
+    Q_CHECK_PTR(edit);
+    Q_CHECK_PTR(timer);
+    Q_CHECK_PTR(label);
+    Q_CHECK_PTR(labelEditFormula);
+    QPalette palette = labelEditFormula->palette();
+    if (edit->toPlainText().isEmpty())
+    {
+        flag = false;
+        palette.setColor(labelEditFormula->foregroundRole(), Qt::red);
+    }
+    else
+    {
+        Calculator cal(data);
+        QString errorMsg;
+        // Replace line return with spaces for calc
+        QString formula = edit->toPlainText();
+        formula.replace("\n"," ");
+        qreal result = cal.eval(formula, &errorMsg);
+        if (errorMsg.isEmpty() == false)
+        {
+            label->setText(tr("Error"));
+            flag = false;
+            palette.setColor(labelEditFormula->foregroundRole(), Qt::red);
+        }
+        else
+        {
+            label->setText(QString().setNum(result));
+            flag = true;
+            palette.setColor(labelEditFormula->foregroundRole(), QColor(76, 76, 76));
+        }
+    }
+    CheckState();
+    timer->stop();
+    labelEditFormula->setPalette(palette);
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 void DialogTool::setCurrentPointId(QComboBox *box, quint32 &pointId, const quint32 &value, const quint32 &id) const
 {
@@ -489,13 +569,22 @@ void DialogTool::DialogRejected()
 
 //---------------------------------------------------------------------------------------------------------------------
 void DialogTool::FormulaChanged()
-{
+{   // TODO issue #79 : erase after full update of tools.
     QLineEdit* edit = qobject_cast<QLineEdit*>(sender());
     if (edit)
     {
         ValFormulaChanged(flagFormula, edit, timerFormula);
     }
 }
+//---------------------------------------------------------------------------------------------------------------------
+void DialogTool::FormulaChanged2()
+{
+    QPlainTextEdit* edit = qobject_cast<QPlainTextEdit*>(sender());
+    if (edit)
+    {
+        ValFormulaChanged(flagFormula, edit, timerFormula);
+    }
+}
 
 //---------------------------------------------------------------------------------------------------------------------
 void DialogTool::ArrowUp()
@@ -556,9 +645,9 @@ void DialogTool::ArrowRightDown()
 //---------------------------------------------------------------------------------------------------------------------
 void DialogTool::EvalFormula()
 {
-    Q_CHECK_PTR(lineEditFormula);
+    Q_CHECK_PTR(plainTextEditFormula);
     Q_CHECK_PTR(labelResultCalculation);
-    Eval(lineEditFormula, flagFormula, timerFormula, labelResultCalculation);
+    Eval(plainTextEditFormula, flagFormula, timerFormula, labelResultCalculation);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -615,19 +704,23 @@ void DialogTool::Increments()
 //---------------------------------------------------------------------------------------------------------------------
 void DialogTool::PutHere()
 {
-    PutValHere(lineEditFormula, listWidget);
+    PutValHere(plainTextEditFormula, listWidget);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
 void DialogTool::PutVal(QListWidgetItem *item)
 {
-    Q_CHECK_PTR(lineEditFormula);
+    Q_CHECK_PTR(plainTextEditFormula);
     Q_CHECK_PTR(item);
-    int pos = lineEditFormula->cursorPosition();
+    QTextCursor cursor = plainTextEditFormula->textCursor();
+    cursor.insertText(item->text());
+    plainTextEditFormula->setTextCursor(cursor);
+    /*int pos = plainTextEditFormula->cursorPosition();
     lineEditFormula->setText(lineEditFormula->text().insert(lineEditFormula->cursorPosition(),
                                                             item->text()));
     lineEditFormula->setFocus();
     lineEditFormula->setCursorPosition(pos + item->text().size());
+    */
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/dialogs/tools/dialogtool.h b/src/app/dialogs/tools/dialogtool.h
index 6def423d3..dc8eed65b 100644
--- a/src/app/dialogs/tools/dialogtool.h
+++ b/src/app/dialogs/tools/dialogtool.h
@@ -37,6 +37,7 @@
 #include <QRadioButton>
 #include <QDialogButtonBox>
 #include <QPushButton>
+#include <QPlainTextEdit>
 #include "../../container/vcontainer.h"
 #include "../../widgets/vapplication.h"
 
@@ -102,6 +103,7 @@ public slots:
      * @brief formula check formula
      */
     void             FormulaChanged();
+    void             FormulaChanged2();
     /**
      * @brief ArrowUp set angle value 90 degree
      */
@@ -214,6 +216,7 @@ protected:
      * @brief lineEditFormula linEdit for formula
      */
     QLineEdit        *lineEditFormula;
+    QPlainTextEdit   *plainTextEditFormula;
     /**
      * @brief listWidget listWidget with variables
      */
@@ -341,6 +344,7 @@ protected:
      * @param listWidget listWidget
      */
     void             PutValHere(QLineEdit *lineEdit, QListWidget *listWidget);
+    void             PutValHere(QPlainTextEdit *plainTextEdit, QListWidget *listWidget);
     /**
      * @brief ValFormulaChanged handle change formula
      * @param flag flag state of formula
@@ -348,6 +352,7 @@ protected:
      * @param timer timer of formula
      */
     void             ValFormulaChanged(bool &flag, QLineEdit *edit, QTimer * timer);
+    void             ValFormulaChanged(bool &flag, QPlainTextEdit *edit, QTimer * timer);
     /**
      * @brief Eval evaluate formula and show result
      * @param edit lineEdit of formula
@@ -355,6 +360,7 @@ protected:
      * @param timer timer of formula
      * @param label label for signal error
      */
+    void             Eval(QPlainTextEdit *edit, bool &flag, QTimer *timer, QLabel *label);
     void             Eval(QLineEdit *edit, bool &flag, QTimer *timer, QLabel *label);
     /**
      * @brief setCurrentPointId set current point id in combobox
diff --git a/src/app/share/resources/icon.qrc b/src/app/share/resources/icon.qrc
index 64d48ee8e..75a714bc7 100644
--- a/src/app/share/resources/icon.qrc
+++ b/src/app/share/resources/icon.qrc
@@ -52,5 +52,7 @@
         <file>icon/flags/uk.png</file>
         <file>icon/Graduation.png</file>
         <file>icon/individual.png</file>
+        <file>icon/16x16/go-down.png</file>
+        <file>icon/16x16/go-next.png</file>
     </qresource>
 </RCC>
diff --git a/src/app/share/resources/icon/16x16/go-down.png b/src/app/share/resources/icon/16x16/go-down.png
new file mode 100644
index 000000000..a74287892
Binary files /dev/null and b/src/app/share/resources/icon/16x16/go-down.png differ
diff --git a/src/app/share/resources/icon/16x16/go-next.png b/src/app/share/resources/icon/16x16/go-next.png
new file mode 100644
index 000000000..5883d9dca
Binary files /dev/null and b/src/app/share/resources/icon/16x16/go-next.png differ