diff --git a/dtool/src/dconfig/dconfig.I b/dtool/src/dconfig/dconfig.I
index c7575db59e..ffa809820e 100644
--- a/dtool/src/dconfig/dconfig.I
+++ b/dtool/src/dconfig/dconfig.I
@@ -28,7 +28,7 @@ GetInt(const string &sym, int def) {
 float DConfig::
 GetFloat(const string &sym, float def) {
   ConfigVariableDouble var(sym, def, "DConfig", ConfigFlags::F_dconfig);
-  return var.get_value();
+  return (float)var.get_value();
 }
 
 double DConfig::
diff --git a/dtool/src/dtoolbase/cmath.I b/dtool/src/dtoolbase/cmath.I
index 03b03f5640..6e8ed6e618 100644
--- a/dtool/src/dtoolbase/cmath.I
+++ b/dtool/src/dtoolbase/cmath.I
@@ -142,7 +142,7 @@ cacos(float v) {
 ////////////////////////////////////////////////////////////////////
 INLINE float
 cmod(float x, float y) {
-  return x - cfloor(x / y) * y;
+  return x - floor(x / y) * y;
 }
 
 ////////////////////////////////////////////////////////////////////
diff --git a/dtool/src/dtoolbase/dtoolbase.h b/dtool/src/dtoolbase/dtoolbase.h
index 4c8b9b28cb..2c883f8220 100644
--- a/dtool/src/dtoolbase/dtoolbase.h
+++ b/dtool/src/dtoolbase/dtoolbase.h
@@ -55,6 +55,8 @@
 #pragma warning (disable : 4355)
 /* C4244: 'initializing' : conversion from 'double' to 'float', possible loss of data */
 #pragma warning (disable : 4244)
+/* C4267: 'var' : conversion from 'size_t' to 'type', possible loss of data */
+#pragma warning (disable : 4267)
 
 #if _MSC_VER >= 1300
  #if _MSC_VER >= 1310
diff --git a/dtool/src/dtoolbase/typeRegistry.I b/dtool/src/dtoolbase/typeRegistry.I
index 21f15f1f1d..3ba8796c45 100644
--- a/dtool/src/dtoolbase/typeRegistry.I
+++ b/dtool/src/dtoolbase/typeRegistry.I
@@ -64,5 +64,5 @@ look_up(TypeHandle handle, TypedObject *object) const {
     return look_up_invalid(handle, object);
   }
 #endif
-  return _handle_registry[handle._index];
+  return _handle_registry[(size_t)handle._index];
 }
diff --git a/dtool/src/prc/configVariable.I b/dtool/src/prc/configVariable.I
index 42500be57f..2b50e2a542 100644
--- a/dtool/src/prc/configVariable.I
+++ b/dtool/src/prc/configVariable.I
@@ -311,7 +311,7 @@ set_int_word(int n, int value) {
 INLINE void ConfigVariable::
 set_int64_word(int n, PN_int64 value) {
   nassertv(is_constructed());
-  _core->make_local_value()->set_int_word(n, value);
+  _core->make_local_value()->set_int64_word(n, value);
 }
 
 ////////////////////////////////////////////////////////////////////
diff --git a/panda/src/display/drawableRegion.I b/panda/src/display/drawableRegion.I
index 269c02c1a1..6383b5a40f 100644
--- a/panda/src/display/drawableRegion.I
+++ b/panda/src/display/drawableRegion.I
@@ -240,7 +240,7 @@ set_clear_stencil(const unsigned int stencil) {
 ////////////////////////////////////////////////////////////////////
 INLINE unsigned int DrawableRegion::
 get_clear_stencil() const {
-  return (int)(get_clear_value(RTP_stencil)[0]);
+  return (unsigned int)(get_clear_value(RTP_stencil)[0]);
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -306,9 +306,9 @@ INLINE void DrawableRegion::
 update_pixel_factor() {
   PN_stdfloat new_pixel_factor;
   if (supports_pixel_zoom()) {
-    new_pixel_factor = 1.0 / sqrt(max(_pixel_zoom, (PN_stdfloat)1.0));
+    new_pixel_factor = (PN_stdfloat)1 / sqrt(max(_pixel_zoom, (PN_stdfloat)1.0));
   } else {
-    new_pixel_factor = 1.0;
+    new_pixel_factor = 1;
   }
   if (new_pixel_factor != _pixel_factor) {
     _pixel_factor = new_pixel_factor;
diff --git a/panda/src/express/datagram.I b/panda/src/express/datagram.I
index 123d428b1b..2853fe6447 100644
--- a/panda/src/express/datagram.I
+++ b/panda/src/express/datagram.I
@@ -353,7 +353,7 @@ add_string(const string &str) {
   nassertv(str.length() <= (PN_uint16)0xffff);
 
   // Strings always are preceded by their length
-  add_uint16(str.length());
+  add_uint16((PN_uint16)str.length());
 
   // Add the string
   append_data(str);
@@ -368,7 +368,7 @@ add_string(const string &str) {
 INLINE void Datagram::
 add_string32(const string &str) {
   // Strings always are preceded by their length
-  add_uint32(str.length());
+  add_uint32((PN_uint32)str.length());
 
   // Add the string
   append_data(str);
diff --git a/panda/src/express/memoryUsage.I b/panda/src/express/memoryUsage.I
index 8f52d9172d..ba2f8c197e 100644
--- a/panda/src/express/memoryUsage.I
+++ b/panda/src/express/memoryUsage.I
@@ -133,7 +133,7 @@ get_total_cpp_size() {
 ////////////////////////////////////////////////////////////////////
 INLINE size_t MemoryUsage::
 get_panda_heap_single_size() {
-  return AtomicAdjust::get(get_global_ptr()->_total_heap_single_size);
+  return (size_t)AtomicAdjust::get(get_global_ptr()->_total_heap_single_size);
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -144,7 +144,7 @@ get_panda_heap_single_size() {
 ////////////////////////////////////////////////////////////////////
 INLINE size_t MemoryUsage::
 get_panda_heap_array_size() {
-  return AtomicAdjust::get(get_global_ptr()->_total_heap_array_size);
+  return (size_t)AtomicAdjust::get(get_global_ptr()->_total_heap_array_size);
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -159,7 +159,7 @@ INLINE size_t MemoryUsage::
 get_panda_heap_overhead() {
 #if defined(USE_MEMORY_DLMALLOC) || defined(USE_MEMORY_PTMALLOC2)
   MemoryUsage *mu = get_global_ptr();
-  return AtomicAdjust::get(mu->_requested_heap_size) - AtomicAdjust::get(mu->_total_heap_single_size) - AtomicAdjust::get(mu->_total_heap_array_size);
+  return (size_t)(AtomicAdjust::get(mu->_requested_heap_size) - AtomicAdjust::get(mu->_total_heap_single_size) - AtomicAdjust::get(mu->_total_heap_array_size));
 #else
   return 0;
 #endif
@@ -173,7 +173,7 @@ get_panda_heap_overhead() {
 ////////////////////////////////////////////////////////////////////
 INLINE size_t MemoryUsage::
 get_panda_mmap_size() {
-  return AtomicAdjust::get(get_global_ptr()->_total_mmap_size);
+  return (size_t)AtomicAdjust::get(get_global_ptr()->_total_mmap_size);
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -206,7 +206,7 @@ get_external_size() {
 #else
     // Without alternative malloc, the Panda allocated memory is also
     // included in total_size, so we have to subtract it out.
-    return mu->_total_size - mu->_total_heap_single_size - mu->_total_heap_array_size;
+    return mu->_total_size - (size_t)mu->_total_heap_single_size - (size_t)mu->_total_heap_array_size;
 #endif
   } else {
     return 0;
@@ -223,12 +223,12 @@ INLINE size_t MemoryUsage::
 get_total_size() {
   MemoryUsage *mu = get_global_ptr();
   if (mu->_count_memory_usage) {
-    return mu->_total_size + mu->_requested_heap_size;
+    return mu->_total_size + (size_t)mu->_requested_heap_size;
   } else {
 #if defined(USE_MEMORY_DLMALLOC) || defined(USE_MEMORY_PTMALLOC2)
-    return mu->_requested_heap_size;
+    return (size_t)mu->_requested_heap_size;
 #else
-    return AtomicAdjust::get(mu->_total_heap_single_size) + AtomicAdjust::get(mu->_total_heap_array_size);
+    return (size_t)(AtomicAdjust::get(mu->_total_heap_single_size) + AtomicAdjust::get(mu->_total_heap_array_size));
 #endif
   }
 }
diff --git a/panda/src/gobj/shader.I b/panda/src/gobj/shader.I
index 1c00d40197..a381cfffdd 100644
--- a/panda/src/gobj/shader.I
+++ b/panda/src/gobj/shader.I
@@ -682,7 +682,7 @@ ShaderPtrData(const LVecBase2i &vec) :
 INLINE void Shader::ShaderPtrData::
 write_datagram(Datagram &dg) const {
   dg.add_uint8(_type);
-  dg.add_uint32(_size);
+  dg.add_uint32((PN_uint32)_size);
 
   if (_type == SPT_double) {
     const double *data = (const double *) _ptr;
@@ -867,7 +867,7 @@ get_filename_from_index(int index, ShaderType type) const {
     }
   } else if (glsl_preprocess && index >= 2048 &&
              (index - 2048) < (int)_included_files.size()) {
-    return _included_files[index - 2048];
+    return _included_files[(size_t)index - 2048];
   }
   // Must be a mistake.  Quietly put back the integer.
   char str[32];
diff --git a/panda/src/linmath/configVariableColor.I b/panda/src/linmath/configVariableColor.I
index a686c988c5..1c5031bfb3 100644
--- a/panda/src/linmath/configVariableColor.I
+++ b/panda/src/linmath/configVariableColor.I
@@ -126,19 +126,23 @@ get_value() const {
 
     switch (get_num_words()) {
     case 1:
-      _cache.set(get_double_word(0), get_double_word(0), get_double_word(0), 1);
+      _cache.set((PN_stdfloat)get_double_word(0), (PN_stdfloat)get_double_word(0),
+                 (PN_stdfloat)get_double_word(0), 1);
       break;
 
     case 2:
-      _cache.set(get_double_word(0), get_double_word(0), get_double_word(0), get_double_word(1));
+      _cache.set((PN_stdfloat)get_double_word(0), (PN_stdfloat)get_double_word(0),
+                 (PN_stdfloat)get_double_word(0), (PN_stdfloat)get_double_word(1));
       break;
 
     case 3:
-      _cache.set(get_double_word(0), get_double_word(1), get_double_word(2), 1);
+      _cache.set((PN_stdfloat)get_double_word(0), (PN_stdfloat)get_double_word(1),
+                 (PN_stdfloat)get_double_word(2), 1);
       break;
 
     case 4:
-      _cache.set(get_double_word(0), get_double_word(1), get_double_word(2), get_double_word(3));
+      _cache.set((PN_stdfloat)get_double_word(0), (PN_stdfloat)get_double_word(1),
+                 (PN_stdfloat)get_double_word(2), (PN_stdfloat)get_double_word(3));
       break;
 
     default:
@@ -161,17 +165,17 @@ get_default_value() const {
   if (decl != (ConfigDeclaration *)NULL) {
     switch (decl->get_num_words()) {
     case 1:
-      return LColor(decl->get_double_word(0), decl->get_double_word(0),
-                    decl->get_double_word(0), 1);
+      return LColor((PN_stdfloat)decl->get_double_word(0), (PN_stdfloat)decl->get_double_word(0),
+                    (PN_stdfloat)decl->get_double_word(0), 1);
     case 2:
-      return LColor(decl->get_double_word(0), decl->get_double_word(0),
-                    decl->get_double_word(0), decl->get_double_word(1));
+      return LColor((PN_stdfloat)decl->get_double_word(0), (PN_stdfloat)decl->get_double_word(0),
+                    (PN_stdfloat)decl->get_double_word(0), (PN_stdfloat)decl->get_double_word(1));
     case 3:
-      return LColor(decl->get_double_word(0), decl->get_double_word(1),
-                    decl->get_double_word(2), 1);
+      return LColor((PN_stdfloat)decl->get_double_word(0), (PN_stdfloat)decl->get_double_word(1),
+                    (PN_stdfloat)decl->get_double_word(2), 1);
     case 4:
-      return LColor(decl->get_double_word(0), decl->get_double_word(1),
-                    decl->get_double_word(2), decl->get_double_word(3));
+      return LColor((PN_stdfloat)decl->get_double_word(0), (PN_stdfloat)decl->get_double_word(1),
+                    (PN_stdfloat)decl->get_double_word(2), (PN_stdfloat)decl->get_double_word(3));
     default:
       prc_cat->warning()
         << "Invalid default color value for ConfigVariable "
diff --git a/panda/src/linmath/lcast_to_src.I b/panda/src/linmath/lcast_to_src.I
index acfcad19d5..9c4f83ca3e 100644
--- a/panda/src/linmath/lcast_to_src.I
+++ b/panda/src/linmath/lcast_to_src.I
@@ -74,47 +74,47 @@ lcast_to(FLOATTYPE *, const FLOATNAME(LMatrix4) &source) {
 
 INLINE_LINMATH FLOATNAME2(LVecBase2)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LVecBase2) &source) {
-  return FLOATNAME2(LVecBase2)(source[0], source[1]);
+  return FLOATNAME2(LVecBase2)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1]);
 }
 
 INLINE_LINMATH FLOATNAME2(LVecBase3)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LVecBase3) &source) {
-  return FLOATNAME2(LVecBase3)(source[0], source[1], source[2]);
+  return FLOATNAME2(LVecBase3)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1], (FLOATTYPE2)source[2]);
 }
 
 INLINE_LINMATH FLOATNAME2(LVecBase4)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LVecBase4) &source) {
-  return FLOATNAME2(LVecBase4)(source[0], source[1], source[2], source[3]);
+  return FLOATNAME2(LVecBase4)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1], (FLOATTYPE2)source[2], (FLOATTYPE2)source[3]);
 }
 
 INLINE_LINMATH FLOATNAME2(LVector2)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LVector2) &source) {
-  return FLOATNAME2(LVector2)(source[0], source[1]);
+  return FLOATNAME2(LVector2)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1]);
 }
 
 INLINE_LINMATH FLOATNAME2(LVector3)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LVector3) &source) {
-  return FLOATNAME2(LVector3)(source[0], source[1], source[2]);
+  return FLOATNAME2(LVector3)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1], (FLOATTYPE2)source[2]);
 }
 
 INLINE_LINMATH FLOATNAME2(LVector4)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LVector4) &source) {
-  return FLOATNAME2(LVector4)(source[0], source[1], source[2], source[3]);
+  return FLOATNAME2(LVector4)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1], (FLOATTYPE2)source[2], (FLOATTYPE2)source[3]);
 }
 
 INLINE_LINMATH FLOATNAME2(LPoint2)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LPoint2) &source) {
-  return FLOATNAME2(LPoint2)(source[0], source[1]);
+  return FLOATNAME2(LPoint2)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1]);
 }
 
 INLINE_LINMATH FLOATNAME2(LPoint3)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LPoint3) &source) {
-  return FLOATNAME2(LPoint3)(source[0], source[1], source[2]);
+  return FLOATNAME2(LPoint3)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1], (FLOATTYPE2)source[2]);
 }
 
 INLINE_LINMATH FLOATNAME2(LPoint4)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LPoint4) &source) {
-  return FLOATNAME2(LPoint4)(source[0], source[1], source[2], source[3]);
+  return FLOATNAME2(LPoint4)((FLOATTYPE2)source[0], (FLOATTYPE2)source[1], (FLOATTYPE2)source[2], (FLOATTYPE2)source[3]);
 }
 
 INLINE_LINMATH FLOATNAME2(LQuaternion)
@@ -125,16 +125,16 @@ lcast_to(FLOATTYPE2 *, const FLOATNAME(LQuaternion) &c) {
 INLINE_LINMATH FLOATNAME2(LMatrix3)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LMatrix3) &source) {
   return FLOATNAME2(LMatrix3)
-    (source(0, 0), source(0, 1), source(0, 2),
-     source(1, 0), source(1, 1), source(1, 2),
-     source(2, 0), source(2, 1), source(2, 2));
+    ((FLOATTYPE2)source(0, 0), (FLOATTYPE2)source(0, 1), (FLOATTYPE2)source(0, 2),
+     (FLOATTYPE2)source(1, 0), (FLOATTYPE2)source(1, 1), (FLOATTYPE2)source(1, 2),
+     (FLOATTYPE2)source(2, 0), (FLOATTYPE2)source(2, 1), (FLOATTYPE2)source(2, 2));
 }
 
 INLINE_LINMATH FLOATNAME2(LMatrix4)
 lcast_to(FLOATTYPE2 *, const FLOATNAME(LMatrix4) &source) {
   return FLOATNAME2(LMatrix4)
-    (source(0, 0), source(0, 1), source(0, 2), source(0, 3),
-     source(1, 0), source(1, 1), source(1, 2), source(1, 3),
-     source(2, 0), source(2, 1), source(2, 2), source(2, 3),
-     source(3, 0), source(3, 1), source(3, 2), source(3, 3));
+    ((FLOATTYPE2)source(0, 0), (FLOATTYPE2)source(0, 1), (FLOATTYPE2)source(0, 2), (FLOATTYPE2)source(0, 3),
+     (FLOATTYPE2)source(1, 0), (FLOATTYPE2)source(1, 1), (FLOATTYPE2)source(1, 2), (FLOATTYPE2)source(1, 3),
+     (FLOATTYPE2)source(2, 0), (FLOATTYPE2)source(2, 1), (FLOATTYPE2)source(2, 2), (FLOATTYPE2)source(2, 3),
+     (FLOATTYPE2)source(3, 0), (FLOATTYPE2)source(3, 1), (FLOATTYPE2)source(3, 2), (FLOATTYPE2)source(3, 3));
 }
diff --git a/panda/src/linmath/lvector3_src.I b/panda/src/linmath/lvector3_src.I
index 5a23e12c43..318d32d2c9 100644
--- a/panda/src/linmath/lvector3_src.I
+++ b/panda/src/linmath/lvector3_src.I
@@ -319,7 +319,7 @@ relative_angle_rad(const FLOATNAME(LVector3) &other) const {
 ////////////////////////////////////////////////////////////////////
 INLINE_LINMATH FLOATTYPE FLOATNAME(LVector3)::
 relative_angle_deg(const FLOATNAME(LVector3) &other) const {
-  return relative_angle_rad(other)*180/3.1415926535;
+  return relative_angle_rad(other) * FLOATCONST(180.0) / FLOATCONST(3.1415926535);
 }
 #endif  // FLOATTYPE_IS_INT