diff --git a/ui/metrics/Android.bp b/ui/metrics/Android.bp
index 1590ab0..96f6389 100644
--- a/ui/metrics/Android.bp
+++ b/ui/metrics/Android.bp
@@ -23,6 +23,7 @@
         "golang-protobuf-proto",
         "soong-ui-metrics_upload_proto",
         "soong-ui-metrics_proto",
+        "soong-ui-bp2build_metrics_proto",
         "soong-ui-tracer",
     ],
     srcs: [
@@ -57,3 +58,15 @@
         "upload_proto/upload.pb.go",
     ],
 }
+
+bootstrap_go_package {
+    name: "soong-ui-bp2build_metrics_proto",
+    pkgPath: "android/soong/ui/metrics/bp2build_metrics_proto",
+    deps: [
+        "golang-protobuf-reflect-protoreflect",
+        "golang-protobuf-runtime-protoimpl",
+    ],
+    srcs: [
+        "bp2build_metrics_proto/bp2build_metrics.pb.go",
+    ],
+}
diff --git a/ui/metrics/bp2build_metrics_proto/bp2build_metrics.pb.go b/ui/metrics/bp2build_metrics_proto/bp2build_metrics.pb.go
new file mode 100644
index 0000000..11177e4
--- /dev/null
+++ b/ui/metrics/bp2build_metrics_proto/bp2build_metrics.pb.go
@@ -0,0 +1,222 @@
+// Copyright 2021 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.27.1
+// 	protoc        v3.9.1
+// source: bp2build_metrics.proto
+
+package bp2build_metrics_proto
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type Bp2BuildMetrics struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Total number of Soong modules converted to generated targets
+	GeneratedModuleCount uint64 `protobuf:"varint,1,opt,name=generatedModuleCount,proto3" json:"generatedModuleCount,omitempty"`
+	// Total number of Soong modules converted to handcrafted targets
+	HandCraftedModuleCount uint64 `protobuf:"varint,2,opt,name=handCraftedModuleCount,proto3" json:"handCraftedModuleCount,omitempty"`
+	// Total number of unconverted Soong modules
+	UnconvertedModuleCount uint64 `protobuf:"varint,3,opt,name=unconvertedModuleCount,proto3" json:"unconvertedModuleCount,omitempty"`
+	// Counts of generated Bazel targets per Bazel rule class
+	RuleClassCount map[string]uint64 `protobuf:"bytes,4,rep,name=ruleClassCount,proto3" json:"ruleClassCount,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
+	// List of converted modules
+	ConvertedModules []string `protobuf:"bytes,5,rep,name=convertedModules,proto3" json:"convertedModules,omitempty"`
+}
+
+func (x *Bp2BuildMetrics) Reset() {
+	*x = Bp2BuildMetrics{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_bp2build_metrics_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Bp2BuildMetrics) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Bp2BuildMetrics) ProtoMessage() {}
+
+func (x *Bp2BuildMetrics) ProtoReflect() protoreflect.Message {
+	mi := &file_bp2build_metrics_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Bp2BuildMetrics.ProtoReflect.Descriptor instead.
+func (*Bp2BuildMetrics) Descriptor() ([]byte, []int) {
+	return file_bp2build_metrics_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Bp2BuildMetrics) GetGeneratedModuleCount() uint64 {
+	if x != nil {
+		return x.GeneratedModuleCount
+	}
+	return 0
+}
+
+func (x *Bp2BuildMetrics) GetHandCraftedModuleCount() uint64 {
+	if x != nil {
+		return x.HandCraftedModuleCount
+	}
+	return 0
+}
+
+func (x *Bp2BuildMetrics) GetUnconvertedModuleCount() uint64 {
+	if x != nil {
+		return x.UnconvertedModuleCount
+	}
+	return 0
+}
+
+func (x *Bp2BuildMetrics) GetRuleClassCount() map[string]uint64 {
+	if x != nil {
+		return x.RuleClassCount
+	}
+	return nil
+}
+
+func (x *Bp2BuildMetrics) GetConvertedModules() []string {
+	if x != nil {
+		return x.ConvertedModules
+	}
+	return nil
+}
+
+var File_bp2build_metrics_proto protoreflect.FileDescriptor
+
+var file_bp2build_metrics_proto_rawDesc = []byte{
+	0x0a, 0x16, 0x62, 0x70, 0x32, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x6d, 0x65, 0x74, 0x72, 0x69,
+	0x63, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x1c, 0x73, 0x6f, 0x6f, 0x6e, 0x67, 0x5f,
+	0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x62, 0x70, 0x32, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x6d,
+	0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x22, 0x8f, 0x03, 0x0a, 0x0f, 0x42, 0x70, 0x32, 0x42, 0x75,
+	0x69, 0x6c, 0x64, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x12, 0x32, 0x0a, 0x14, 0x67, 0x65,
+	0x6e, 0x65, 0x72, 0x61, 0x74, 0x65, 0x64, 0x4d, 0x6f, 0x64, 0x75, 0x6c, 0x65, 0x43, 0x6f, 0x75,
+	0x6e, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x14, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61,
+	0x74, 0x65, 0x64, 0x4d, 0x6f, 0x64, 0x75, 0x6c, 0x65, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x36,
+	0x0a, 0x16, 0x68, 0x61, 0x6e, 0x64, 0x43, 0x72, 0x61, 0x66, 0x74, 0x65, 0x64, 0x4d, 0x6f, 0x64,
+	0x75, 0x6c, 0x65, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x04, 0x52, 0x16,
+	0x68, 0x61, 0x6e, 0x64, 0x43, 0x72, 0x61, 0x66, 0x74, 0x65, 0x64, 0x4d, 0x6f, 0x64, 0x75, 0x6c,
+	0x65, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x36, 0x0a, 0x16, 0x75, 0x6e, 0x63, 0x6f, 0x6e, 0x76,
+	0x65, 0x72, 0x74, 0x65, 0x64, 0x4d, 0x6f, 0x64, 0x75, 0x6c, 0x65, 0x43, 0x6f, 0x75, 0x6e, 0x74,
+	0x18, 0x03, 0x20, 0x01, 0x28, 0x04, 0x52, 0x16, 0x75, 0x6e, 0x63, 0x6f, 0x6e, 0x76, 0x65, 0x72,
+	0x74, 0x65, 0x64, 0x4d, 0x6f, 0x64, 0x75, 0x6c, 0x65, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x69,
+	0x0a, 0x0e, 0x72, 0x75, 0x6c, 0x65, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x43, 0x6f, 0x75, 0x6e, 0x74,
+	0x18, 0x04, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x41, 0x2e, 0x73, 0x6f, 0x6f, 0x6e, 0x67, 0x5f, 0x62,
+	0x75, 0x69, 0x6c, 0x64, 0x5f, 0x62, 0x70, 0x32, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x6d, 0x65,
+	0x74, 0x72, 0x69, 0x63, 0x73, 0x2e, 0x42, 0x70, 0x32, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x4d, 0x65,
+	0x74, 0x72, 0x69, 0x63, 0x73, 0x2e, 0x52, 0x75, 0x6c, 0x65, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x43,
+	0x6f, 0x75, 0x6e, 0x74, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x0e, 0x72, 0x75, 0x6c, 0x65, 0x43,
+	0x6c, 0x61, 0x73, 0x73, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x2a, 0x0a, 0x10, 0x63, 0x6f, 0x6e,
+	0x76, 0x65, 0x72, 0x74, 0x65, 0x64, 0x4d, 0x6f, 0x64, 0x75, 0x6c, 0x65, 0x73, 0x18, 0x05, 0x20,
+	0x03, 0x28, 0x09, 0x52, 0x10, 0x63, 0x6f, 0x6e, 0x76, 0x65, 0x72, 0x74, 0x65, 0x64, 0x4d, 0x6f,
+	0x64, 0x75, 0x6c, 0x65, 0x73, 0x1a, 0x41, 0x0a, 0x13, 0x52, 0x75, 0x6c, 0x65, 0x43, 0x6c, 0x61,
+	0x73, 0x73, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03,
+	0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x14,
+	0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x04, 0x52, 0x05, 0x76,
+	0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x42, 0x31, 0x5a, 0x2f, 0x61, 0x6e, 0x64, 0x72,
+	0x6f, 0x69, 0x64, 0x2f, 0x73, 0x6f, 0x6f, 0x6e, 0x67, 0x2f, 0x75, 0x69, 0x2f, 0x6d, 0x65, 0x74,
+	0x72, 0x69, 0x63, 0x73, 0x2f, 0x62, 0x70, 0x32, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x6d, 0x65,
+	0x74, 0x72, 0x69, 0x63, 0x73, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
+}
+
+var (
+	file_bp2build_metrics_proto_rawDescOnce sync.Once
+	file_bp2build_metrics_proto_rawDescData = file_bp2build_metrics_proto_rawDesc
+)
+
+func file_bp2build_metrics_proto_rawDescGZIP() []byte {
+	file_bp2build_metrics_proto_rawDescOnce.Do(func() {
+		file_bp2build_metrics_proto_rawDescData = protoimpl.X.CompressGZIP(file_bp2build_metrics_proto_rawDescData)
+	})
+	return file_bp2build_metrics_proto_rawDescData
+}
+
+var file_bp2build_metrics_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_bp2build_metrics_proto_goTypes = []interface{}{
+	(*Bp2BuildMetrics)(nil), // 0: soong_build_bp2build_metrics.Bp2BuildMetrics
+	nil,                     // 1: soong_build_bp2build_metrics.Bp2BuildMetrics.RuleClassCountEntry
+}
+var file_bp2build_metrics_proto_depIdxs = []int32{
+	1, // 0: soong_build_bp2build_metrics.Bp2BuildMetrics.ruleClassCount:type_name -> soong_build_bp2build_metrics.Bp2BuildMetrics.RuleClassCountEntry
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_bp2build_metrics_proto_init() }
+func file_bp2build_metrics_proto_init() {
+	if File_bp2build_metrics_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_bp2build_metrics_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Bp2BuildMetrics); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_bp2build_metrics_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_bp2build_metrics_proto_goTypes,
+		DependencyIndexes: file_bp2build_metrics_proto_depIdxs,
+		MessageInfos:      file_bp2build_metrics_proto_msgTypes,
+	}.Build()
+	File_bp2build_metrics_proto = out.File
+	file_bp2build_metrics_proto_rawDesc = nil
+	file_bp2build_metrics_proto_goTypes = nil
+	file_bp2build_metrics_proto_depIdxs = nil
+}
diff --git a/ui/metrics/bp2build_metrics_proto/bp2build_metrics.proto b/ui/metrics/bp2build_metrics_proto/bp2build_metrics.proto
new file mode 100644
index 0000000..5e88966
--- /dev/null
+++ b/ui/metrics/bp2build_metrics_proto/bp2build_metrics.proto
@@ -0,0 +1,35 @@
+// Copyright 2021 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package soong_build_bp2build_metrics;
+option go_package = "android/soong/ui/metrics/bp2build_metrics_proto";
+
+message Bp2BuildMetrics {
+  // Total number of Soong modules converted to generated targets
+  uint64 generatedModuleCount = 1;
+
+  // Total number of Soong modules converted to handcrafted targets
+  uint64 handCraftedModuleCount = 2;
+
+  // Total number of unconverted Soong modules
+  uint64 unconvertedModuleCount = 3;
+
+  // Counts of generated Bazel targets per Bazel rule class
+  map<string, uint64> ruleClassCount = 4;
+
+  // List of converted modules
+  repeated string convertedModules = 5;
+}
diff --git a/ui/metrics/bp2build_metrics_proto/regen.sh b/ui/metrics/bp2build_metrics_proto/regen.sh
new file mode 100755
index 0000000..bfe4294
--- /dev/null
+++ b/ui/metrics/bp2build_metrics_proto/regen.sh
@@ -0,0 +1,29 @@
+#!/bin/bash -e
+
+# Copyright 2021 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Generates the golang source file of bp2build_metrics.proto protobuf file.
+
+function die() { echo "ERROR: $1" >&2; exit 1; }
+
+readonly error_msg="Maybe you need to run 'lunch aosp_arm-eng && m aprotoc blueprint_tools'?"
+
+if ! hash aprotoc &>/dev/null; then
+  die "could not find aprotoc. ${error_msg}"
+fi
+
+if ! aprotoc --go_out=paths=source_relative:. bp2build_metrics.proto; then
+  die "build failed. ${error_msg}"
+fi