diff --git a/calculatorpp/project.properties b/calculatorpp/project.properties
index febda8cf..7be8ede0 100644
--- a/calculatorpp/project.properties
+++ b/calculatorpp/project.properties
@@ -10,5 +10,5 @@
 # Project target.
 target=android-15
 android.library.reference.1=../calculatorpp-service
-android.library.reference.2=gen-external-apklibs/org.solovyev.android_common_0.1.3
+android.library.reference.2=gen-external-apklibs/org.solovyev.android_common_0.1.4
 
diff --git a/calculatorpp/res/layout/unit_converter.xml b/calculatorpp/res/layout/unit_converter.xml
index 5c4a3273..878af88a 100644
--- a/calculatorpp/res/layout/unit_converter.xml
+++ b/calculatorpp/res/layout/unit_converter.xml
@@ -51,21 +51,25 @@
 
         <Button a:id="@+id/unit_converter_ok_button"
                 a:text="@android:string/ok"
-                a:paddingLeft="30dp"
-                a:paddingRight="30dp"
+                a:paddingLeft="15dp"
+                a:paddingRight="15dp"
+                a:singleLine="true"
                 a:layout_width="wrap_content"
                 a:layout_height="wrap_content"/>
 
         <Button a:id="@+id/unit_converter_copy_button"
                 a:text="@android:string/copy"
-                a:paddingLeft="30dp"
-                a:paddingRight="30dp"
+                a:paddingLeft="15dp"
+                a:paddingRight="15dp"
+                a:singleLine="true"
                 a:layout_width="wrap_content"
                 a:layout_height="wrap_content"/>
 
         <Button a:id="@+id/unit_converter_custom_button"
-                a:paddingLeft="30dp"
-                a:paddingRight="30dp"
+                a:paddingLeft="15dp"
+                a:paddingRight="15dp"
+                a:ellipsize="end"
+                a:singleLine="true"
                 a:layout_width="wrap_content"
                 a:layout_height="wrap_content"/>
 
diff --git a/calculatorpp/res/values-ru/text_strings.xml b/calculatorpp/res/values-ru/text_strings.xml
index f23c92af..caabd673 100644
--- a/calculatorpp/res/values-ru/text_strings.xml
+++ b/calculatorpp/res/values-ru/text_strings.xml
@@ -199,4 +199,8 @@
 
     <string name="c_convert">Перевести в…</string>
 
+    <string name="convert_to_hex">Перевести в hex</string>
+    <string name="convert_to_bin">Перевести в bin</string>
+    <string name="convert_to_dec">Перевести в dec</string>
+
 </resources>
\ No newline at end of file
diff --git a/calculatorpp/res/values-uk/text_strings.xml b/calculatorpp/res/values-uk/text_strings.xml
index 37e7329b..48a43eb9 100644
--- a/calculatorpp/res/values-uk/text_strings.xml
+++ b/calculatorpp/res/values-uk/text_strings.xml
@@ -199,4 +199,8 @@
 
     <string name="c_convert">Перевести в…</string>
 
+    <string name="convert_to_hex">Перевести в hex</string>
+    <string name="convert_to_bin">Перевести в bin</string>
+    <string name="convert_to_dec">Перевести в dec</string>
+
 </resources>
diff --git a/calculatorpp/res/values/text_strings.xml b/calculatorpp/res/values/text_strings.xml
index af8ed715..e3a621ed 100644
--- a/calculatorpp/res/values/text_strings.xml
+++ b/calculatorpp/res/values/text_strings.xml
@@ -199,4 +199,8 @@
 
     <string name="c_convert">Convert to…</string>
 
+    <string name="convert_to_hex">Convert to hex</string>
+    <string name="convert_to_bin">Convert to bin</string>
+    <string name="convert_to_dec">Convert to dec</string>
+
 </resources>
\ No newline at end of file
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidNumeralBase.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidNumeralBase.java
index d7407dec..7e9262fe 100644
--- a/calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidNumeralBase.java
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidNumeralBase.java
@@ -99,6 +99,11 @@ public enum AndroidNumeralBase implements UnitType<String> {
         button.setShowText(show);
     }
 
+    @NotNull
+    public NumeralBase getNumeralBase() {
+        return numeralBase;
+    }
+
     @NotNull
     @Override
     public Class<String> getUnitValueClass() {
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorDisplay.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorDisplay.java
index b799e741..8ec44603 100644
--- a/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorDisplay.java
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorDisplay.java
@@ -10,6 +10,7 @@ import android.graphics.Color;
 import android.text.Html;
 import android.util.AttributeSet;
 import android.util.Log;
+import jscl.NumeralBase;
 import jscl.math.Generic;
 import jscl.math.function.Constant;
 import jscl.math.function.IConstant;
@@ -19,11 +20,15 @@ import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.calculator.model.CalculatorEngine;
 import org.solovyev.android.calculator.model.CalculatorParseException;
 import org.solovyev.android.calculator.model.TextProcessor;
+import org.solovyev.android.calculator.model.ToJsclTextProcessor;
 import org.solovyev.android.calculator.view.NumeralBaseConverterDialog;
 import org.solovyev.android.calculator.view.TextHighlighter;
+import org.solovyev.android.calculator.view.UnitConverterViewBuilder;
+import org.solovyev.android.menu.AMenuItem;
 import org.solovyev.android.menu.LabeledMenuItem;
 import org.solovyev.android.view.AutoResizeTextView;
 import org.solovyev.common.utils.CollectionsUtils;
+import org.solovyev.common.utils.StringUtils;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -35,7 +40,80 @@ import java.util.Set;
  */
 public class CalculatorDisplay extends AutoResizeTextView implements ICalculatorDisplay{
 
-	public static enum MenuItem implements LabeledMenuItem<CalculatorDisplay> {
+    private static enum ConversionMenuItem implements AMenuItem<CalculatorDisplay> {
+        convert_to_bin(NumeralBase.bin),
+        convert_to_dec(NumeralBase.dec),
+        convert_to_hex(NumeralBase.hex);
+
+        @NotNull
+        private final NumeralBase toNumeralBase;
+
+        private ConversionMenuItem(@NotNull NumeralBase toNumeralBase) {
+            this.toNumeralBase = toNumeralBase;
+        }
+
+        protected boolean isItemVisibleFor(@NotNull Generic generic, @NotNull JsclOperation operation) {
+            boolean result = false;
+
+            if (operation == JsclOperation.numeric) {
+                if (generic.getConstants().isEmpty()) {
+                    try {
+                        convert(generic);
+
+                        // conversion possible => return true
+                        result = true;
+
+                    } catch (UnitConverterViewBuilder.ConversionException e) {
+                        // conversion is not possible => return false
+                    }
+                }
+            }
+
+            return result;
+        }
+
+        @Override
+        public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+            final NumeralBase fromNumeralBase = CalculatorEngine.instance.getEngine().getNumeralBase();
+
+            String to;
+            try {
+                to = convert(data.getGenericResult());
+
+                // add prefix
+                if (fromNumeralBase != toNumeralBase) {
+                    to = toNumeralBase.getJsclPrefix() + to;
+                }
+            } catch (UnitConverterViewBuilder.ConversionException e) {
+                to = context.getString(R.string.c_error);
+            }
+
+            data.setText(to);
+            data.redraw();
+        }
+
+        @NotNull
+        private String convert(@NotNull Generic generic) throws UnitConverterViewBuilder.ConversionException {
+            final NumeralBase fromNumeralBase = CalculatorEngine.instance.getEngine().getNumeralBase();
+
+            if (fromNumeralBase != toNumeralBase) {
+                String from = generic.toString();
+                if (!StringUtils.isEmpty(from)) {
+                    try {
+                        from = ToJsclTextProcessor.getInstance().process(from).getExpression();
+                    } catch (CalculatorParseException e) {
+                        // ok, problems while processing occurred
+                    }
+                }
+
+                return UnitConverterViewBuilder.doConversion(AndroidNumeralBase.getConverter(), from, AndroidNumeralBase.valueOf(fromNumeralBase), AndroidNumeralBase.valueOf(toNumeralBase));
+            } else {
+                return generic.toString();
+            }
+        }
+    }
+
+    public static enum MenuItem implements LabeledMenuItem<CalculatorDisplay> {
 
         copy(R.string.c_copy) {
             @Override
@@ -44,6 +122,42 @@ public class CalculatorDisplay extends AutoResizeTextView implements ICalculator
             }
         },
 
+        convert_to_bin(R.string.convert_to_bin) {
+            @Override
+            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+                ConversionMenuItem.convert_to_bin.onClick(data, context);
+            }
+
+            @Override
+            protected boolean isItemVisibleFor(@NotNull Generic generic, @NotNull JsclOperation operation) {
+                return ConversionMenuItem.convert_to_bin.isItemVisibleFor(generic, operation);
+            }
+        },
+
+        convert_to_dec(R.string.convert_to_dec) {
+            @Override
+            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+                ConversionMenuItem.convert_to_dec.onClick(data, context);
+            }
+
+            @Override
+            protected boolean isItemVisibleFor(@NotNull Generic generic, @NotNull JsclOperation operation) {
+                return ConversionMenuItem.convert_to_dec.isItemVisibleFor(generic, operation);
+            }
+        },
+
+        convert_to_hex(R.string.convert_to_hex) {
+            @Override
+            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+                ConversionMenuItem.convert_to_hex.onClick(data, context);
+            }
+
+            @Override
+            protected boolean isItemVisibleFor(@NotNull Generic generic, @NotNull JsclOperation operation) {
+                return ConversionMenuItem.convert_to_hex.isItemVisibleFor(generic, operation);
+            }
+        },
+
         convert(R.string.c_convert) {
             @Override
             public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/view/NumeralBaseConverterDialog.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/view/NumeralBaseConverterDialog.java
index 2e3aa43c..bfc9b11c 100644
--- a/calculatorpp/src/main/java/org/solovyev/android/calculator/view/NumeralBaseConverterDialog.java
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/view/NumeralBaseConverterDialog.java
@@ -4,12 +4,11 @@ import android.app.AlertDialog;
 import android.content.Context;
 import android.view.View;
 import android.view.WindowManager;
-import jscl.NumeralBase;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import org.solovyev.android.calculator.AndroidNumeralBase;
 import org.solovyev.android.Unit;
 import org.solovyev.android.UnitImpl;
+import org.solovyev.android.calculator.AndroidNumeralBase;
 import org.solovyev.android.calculator.CalculatorModel;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.CalculatorEngine;
@@ -70,12 +69,7 @@ public class NumeralBaseConverterDialog {
                 String toUnitsValue = toUnits.getValue();
 
                 if (!toUnits.getUnitType().equals(AndroidNumeralBase.valueOf(CalculatorEngine.instance.getEngine().getNumeralBase()))) {
-                    for (NumeralBase nb : NumeralBase.values()) {
-                        if (AndroidNumeralBase.valueOf(nb).equals(toUnits.getUnitType())) {
-                            toUnitsValue = nb.getJsclPrefix() + toUnitsValue;
-                            break;
-                        }
-                    }
+                    toUnitsValue = ((AndroidNumeralBase) toUnits.getUnitType()).getNumeralBase().getJsclPrefix() + toUnitsValue;
                 }
 
                 CalculatorModel.instance.processDigitButtonAction(toUnitsValue, false);
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/view/UnitConverterViewBuilder.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/view/UnitConverterViewBuilder.java
index fc8107c1..c7f3218a 100644
--- a/calculatorpp/src/main/java/org/solovyev/android/calculator/view/UnitConverterViewBuilder.java
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/view/UnitConverterViewBuilder.java
@@ -172,11 +172,32 @@ public class UnitConverterViewBuilder implements ViewBuilder<View> {
         final EditText toEditText = (EditText) main.findViewById(R.id.units_to);
 
         final String from = fromEditText.getText().toString();
+        try {
+            toEditText.setText(doConversion(converter, from, getFromUnitType(main), getToUnitType(main)));
+        } catch (ConversionException e) {
+            toEditText.setText(context.getString(R.string.c_error));
+        }
+    }
+
+    public static final class ConversionException extends Exception {
+        private ConversionException() {
+        }
+
+        private ConversionException(Throwable throwable) {
+            super(throwable);
+        }
+    }
+
+    @NotNull
+    public static String doConversion(@NotNull UnitConverter<String> converter,
+                                      @Nullable String from,
+                                      @NotNull UnitType<String> fromUnitType,
+                                      @NotNull UnitType<String> toUnitType) throws ConversionException{
+        final String result;
+
         if (StringUtils.isEmpty(from)) {
-            toEditText.setText("");
+            result = "";
         } else {
-            final UnitType<String> fromUnitType = getFromUnitType(main);
-            final UnitType<String> toUnitType = getToUnitType(main);
 
             String to = null;
             try {
@@ -184,11 +205,13 @@ public class UnitConverterViewBuilder implements ViewBuilder<View> {
                     to = converter.convert(UnitImpl.newInstance(from, fromUnitType), toUnitType).getValue();
                 }
             } catch (RuntimeException e) {
-                to = context.getString(R.string.c_error);
+                throw new ConversionException(e);
             }
 
-            toEditText.setText(to);
+            result = to;
         }
+
+        return result;
     }
 
     @NotNull
diff --git a/pom.xml b/pom.xml
index e8d08254..6318b869 100644
--- a/pom.xml
+++ b/pom.xml
@@ -33,7 +33,7 @@
             <dependency>
                 <groupId>org.solovyev.android</groupId>
                 <artifactId>common</artifactId>
-                <version>0.1.3</version>
+                <version>0.1.4</version>
                 <type>apklib</type>
             </dependency>