diff --git a/go/sizes.go b/go/sizes.go
new file mode 100644
index 0000000..ba22169
--- /dev/null
+++ b/go/sizes.go
@@ -0,0 +1,55 @@
+package flatbuffers
+
+import (
+	"unsafe"
+)
+
+const (
+	// See http://golang.org/ref/spec#Numeric_types
+
+	// SizeUint8 is the byte size of a uint8.
+	SizeUint8 = 1
+	// SizeUint16 is the byte size of a uint16.
+	SizeUint16 = 2
+	// SizeUint32 is the byte size of a uint32.
+	SizeUint32 = 4
+	// SizeUint64 is the byte size of a uint64.
+	SizeUint64 = 8
+
+	// SizeInt8 is the byte size of a int8.
+	SizeInt8 = 1
+	// SizeInt16 is the byte size of a int16.
+	SizeInt16 = 2
+	// SizeInt32 is the byte size of a int32.
+	SizeInt32 = 4
+	// SizeInt64 is the byte size of a int64.
+	SizeInt64 = 8
+
+	// SizeFloat32 is the byte size of a float32.
+	SizeFloat32 = 4
+	// SizeFloat64 is the byte size of a float64.
+	SizeFloat64 = 8
+
+	// SizeByte is the byte size of a byte.
+	// The `byte` type is aliased (by Go definition) to uint8.
+	SizeByte = 1
+
+	// SizeBool is the byte size of a bool.
+	// The `bool` type is aliased (by flatbuffers convention) to uint8.
+	SizeBool = 1
+
+	// SizeSOffsetT is the byte size of an SOffsetT.
+	// The `SOffsetT` type is aliased (by flatbuffers convention) to int32.
+	SizeSOffsetT = 4
+	// SizeUOffsetT is the byte size of an UOffsetT.
+	// The `UOffsetT` type is aliased (by flatbuffers convention) to uint32.
+	SizeUOffsetT = 4
+	// SizeVOffsetT is the byte size of an VOffsetT.
+	// The `VOffsetT` type is aliased (by flatbuffers convention) to uint16.
+	SizeVOffsetT = 2
+)
+
+// byteSliceToString converts a []byte to string without a heap allocation.
+func byteSliceToString(b []byte) string {
+	return *(*string)(unsafe.Pointer(&b))
+}