diff --git a/src/runtime/Native/ITypeOffsets.cs b/src/runtime/Native/ITypeOffsets.cs
index 2c4fdf59a..0920a312a 100644
--- a/src/runtime/Native/ITypeOffsets.cs
+++ b/src/runtime/Native/ITypeOffsets.cs
@@ -22,6 +22,7 @@ interface ITypeOffsets
         int nb_true_divide { get; }
         int nb_and { get; }
         int nb_int { get; }
+        int nb_float { get; }
         int nb_or { get; }
         int nb_xor { get; }
         int nb_lshift { get; }
diff --git a/src/runtime/Native/TypeOffset.cs b/src/runtime/Native/TypeOffset.cs
index 59c5c3ee0..847f1766d 100644
--- a/src/runtime/Native/TypeOffset.cs
+++ b/src/runtime/Native/TypeOffset.cs
@@ -31,6 +31,7 @@ static partial class TypeOffset
         internal static int nb_or { get; private set; }
         internal static int nb_xor { get; private set; }
         internal static int nb_int { get; private set; }
+        internal static int nb_float { get; private set; }
         internal static int nb_lshift { get; private set; }
         internal static int nb_rshift { get; private set; }
         internal static int nb_remainder { get; private set; }
diff --git a/src/runtime/Types/ClassBase.cs b/src/runtime/Types/ClassBase.cs
index 1e3c325cc..943841e25 100644
--- a/src/runtime/Types/ClassBase.cs
+++ b/src/runtime/Types/ClassBase.cs
@@ -529,6 +529,37 @@ static NewReference tp_call_impl(BorrowedReference ob, BorrowedReference args, B
             return callBinder.Invoke(ob, args, kw);
         }
 
+        static NewReference DoConvert(BorrowedReference ob)
+        {
+            var self = (CLRObject)GetManagedObject(ob)!;
+            using var python = self.inst.ToPython();
+            return python.NewReferenceOrNull();
+        }
+
+        static NewReference DoConvertInt(BorrowedReference ob)
+        {
+            var self = (CLRObject)GetManagedObject(ob)!;
+            return Runtime.PyLong_FromLongLong(Convert.ToInt64(self.inst));
+        }
+
+        static NewReference DoConvertUInt(BorrowedReference ob)
+        {
+            var self = (CLRObject)GetManagedObject(ob)!;
+            return Runtime.PyLong_FromUnsignedLongLong(Convert.ToUInt64(self.inst));
+        }
+
+        static NewReference DoConvertBooleanInt(BorrowedReference ob)
+        {
+            var self = (CLRObject)GetManagedObject(ob)!;
+            return Runtime.PyInt_FromInt32((bool)self.inst ? 1 : 0);
+        }
+
+        static NewReference DoConvertFloat(BorrowedReference ob)
+        {
+            var self = (CLRObject)GetManagedObject(ob)!;
+            return Runtime.PyFloat_FromDouble(Convert.ToDouble(self.inst));
+        }
+
         static IEnumerable<MethodInfo> GetCallImplementations(Type type)
             => type.GetMethods(BindingFlags.Public | BindingFlags.Instance)
                 .Where(m => m.Name == "__call__");
@@ -564,6 +595,29 @@ public virtual void InitializeSlots(BorrowedReference pyType, SlotsHolder slotsH
             {
                 TypeManager.InitializeSlotIfEmpty(pyType, TypeOffset.mp_length, new Interop.B_P(MpLengthSlot.impl), slotsHolder);
             }
+
+            switch (Type.GetTypeCode(type.Value))
+            {
+                case TypeCode.Boolean:
+                case TypeCode.SByte:
+                case TypeCode.Int16:
+                case TypeCode.Int32:
+                case TypeCode.Int64:
+                    TypeManager.InitializeSlotIfEmpty(pyType, TypeOffset.nb_int, new Interop.B_N(DoConvertInt), slotsHolder);
+                    TypeManager.InitializeSlotIfEmpty(pyType, TypeOffset.nb_float, new Interop.B_N(DoConvertFloat), slotsHolder);
+                    break;
+                case TypeCode.Byte:
+                case TypeCode.UInt16:
+                case TypeCode.UInt32:
+                case TypeCode.UInt64:
+                    TypeManager.InitializeSlotIfEmpty(pyType, TypeOffset.nb_int, new Interop.B_N(DoConvertUInt), slotsHolder);
+                    TypeManager.InitializeSlotIfEmpty(pyType, TypeOffset.nb_float, new Interop.B_N(DoConvertFloat), slotsHolder);
+                    break;
+                case TypeCode.Double:
+                case TypeCode.Single:
+                    TypeManager.InitializeSlotIfEmpty(pyType, TypeOffset.nb_float, new Interop.B_N(DoConvertFloat), slotsHolder);
+                    break;
+            }
         }
 
         public virtual bool HasCustomNew() => this.GetType().GetMethod("tp_new") is not null;
diff --git a/src/runtime/Types/OperatorMethod.cs b/src/runtime/Types/OperatorMethod.cs
index 0c6127f65..88939a51d 100644
--- a/src/runtime/Types/OperatorMethod.cs
+++ b/src/runtime/Types/OperatorMethod.cs
@@ -53,6 +53,7 @@ static OperatorMethod()
                 ["op_UnaryPlus"] = new SlotDefinition("__pos__", TypeOffset.nb_positive),
 
                 ["__int__"] = new SlotDefinition("__int__", TypeOffset.nb_int),
+                ["__float__"] = new SlotDefinition("__float__", TypeOffset.nb_float),
             };
             ComparisonOpMap = new Dictionary<string, string>
             {
diff --git a/tests/test_conversion.py b/tests/test_conversion.py
index f8d8039c6..69e7ec63f 100644
--- a/tests/test_conversion.py
+++ b/tests/test_conversion.py
@@ -720,3 +720,28 @@ def test_intptr_construction():
         with pytest.raises(OverflowError):
             UIntPtr(v)
 
+def test_explicit_conversion():
+    from System import (
+        Int64, UInt64, Int32, UInt32, Int16, UInt16, Byte, SByte, Boolean
+    )
+    from System import Double, Single
+
+    assert int(Boolean(False)) == 0
+    assert int(Boolean(True)) == 1
+
+    for t in [UInt64, UInt32, UInt16, Byte]:
+        assert int(t(127)) == 127
+        assert float(t(127)) == 127.0
+
+    for t in [Int64, Int32, Int16, SByte]:
+        assert int(t(127)) == 127
+        assert int(t(-127)) == -127
+        assert float(t(127)) == 127.0
+        assert float(t(-127)) == -127.0
+
+    assert int(Int64.MaxValue) == 2**63 - 1
+    assert int(Int64.MinValue) == -2**63
+    assert int(UInt64.MaxValue) == 2**64 - 1
+
+    for t in [Single, Double]:
+        assert float(t(0.125)) == 0.125