diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
index 4bf7397f930..08e33c233e7 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
@@ -29,4 +29,8 @@ public final class NumberTest extends SingleFileTranslationTest {
     public void testIntConversions() throws Exception {
         fooBoxTest();
     }
+
+    public void testDoubleConversions() throws Exception {
+        fooBoxTest();
+    }
 }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/NumberConversionFIF.java b/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/NumberConversionFIF.java
index 7d34ee3f8f0..afcc9070ab5 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/NumberConversionFIF.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/NumberConversionFIF.java
@@ -21,7 +21,9 @@ import com.google.dart.compiler.backend.js.ast.JsExpression;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.resolve.name.Name;
+import org.jetbrains.jet.lang.types.expressions.OperatorConventions;
 import org.jetbrains.k2js.translate.context.TranslationContext;
+import org.jetbrains.k2js.translate.intrinsic.functions.basic.CallStandardMethodIntrinsic;
 import org.jetbrains.k2js.translate.intrinsic.functions.basic.FunctionIntrinsic;
 import org.jetbrains.k2js.translate.intrinsic.functions.patterns.NameChecker;
 
@@ -36,16 +38,23 @@ import static org.jetbrains.k2js.translate.intrinsic.functions.patterns.PatternB
  */
 public final class NumberConversionFIF {
     @NotNull
-    private static final NameChecker CONVERSIONS;
+    private static final NameChecker SUPPORTED_CONVERSIONS;
 
     static {
         HashSet<Name> supportedConversions = Sets.newHashSet(NUMBER_CONVERSIONS);
         //TODO: support longs and chars
         supportedConversions.remove(CHAR);
         supportedConversions.remove(LONG);
-        CONVERSIONS = new NameChecker(supportedConversions);
+        SUPPORTED_CONVERSIONS = new NameChecker(supportedConversions);
     }
 
+    @NotNull
+    private static final NameChecker FLOATING_POINT_CONVERSIONS = new NameChecker(OperatorConventions.FLOAT, OperatorConventions.DOUBLE);
+
+    @NotNull
+    private static final NameChecker INTEGER_CONVERSIONS = new NameChecker(OperatorConventions.INT, OperatorConventions.SHORT,
+                                                                           OperatorConventions.BYTE);
+
     @NotNull
     private static final FunctionIntrinsic RETURN_RECEIVER = new FunctionIntrinsic() {
         @NotNull
@@ -61,7 +70,9 @@ public final class NumberConversionFIF {
 
     @NotNull
     public static final FunctionIntrinsicFactory INSTANCE = FIFBuilder.start()
-            .add(pattern("Int", CONVERSIONS), RETURN_RECEIVER)
+            .add(pattern("Int", SUPPORTED_CONVERSIONS), RETURN_RECEIVER)
+            .add(pattern("Double", INTEGER_CONVERSIONS), new CallStandardMethodIntrinsic("Math.floor", true, 0))
+            .add(pattern("Double", FLOATING_POINT_CONVERSIONS), RETURN_RECEIVER)
             .build();
 
     private NumberConversionFIF() {
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/patterns/NameChecker.java b/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/patterns/NameChecker.java
index bf77fff7ed0..6945b3c4154 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/patterns/NameChecker.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/patterns/NameChecker.java
@@ -49,6 +49,10 @@ public final class NameChecker {
         this.validNames.addAll(validNames);
     }
 
+    public NameChecker(@NotNull Name... validNames) {
+        this.validNames.addAll(Lists.newArrayList(validNames));
+    }
+
     public boolean isValid(@NotNull Name name) {
         for (Name validName : validNames) {
             if (name.equals(validName)) {
diff --git a/js/js.translator/testFiles/number/cases/doubleConversions.kt b/js/js.translator/testFiles/number/cases/doubleConversions.kt
new file mode 100644
index 00000000000..c41b0f253ae
--- /dev/null
+++ b/js/js.translator/testFiles/number/cases/doubleConversions.kt
@@ -0,0 +1,21 @@
+package foo
+
+fun box(): Boolean {
+    val c: Double = 3.6
+    if (c.toDouble() != 3.6) {
+        return false
+    }
+    if (c.toFloat() != 3.6.toFloat()) {
+        return false
+    }
+    if (c.toByte() != 3.toByte()) {
+        return false
+    }
+    if (c.toInt() != 3) {
+        return false
+    }
+    if (c.toShort() != 3.toShort()) {
+        return false
+    }
+    return true
+}
\ No newline at end of file