diff --git a/libkineto/libkineto_defs.bzl b/libkineto/libkineto_defs.bzl
index 32f5a4286..c3d6e63db 100644
--- a/libkineto/libkineto_defs.bzl
+++ b/libkineto/libkineto_defs.bzl
@@ -30,6 +30,7 @@ def get_libkineto_srcs(with_api = True):
         "src/init.cpp",
         "src/output_csv.cpp",
         "src/output_json.cpp",
+        "src/CudaDeviceProperties.cpp",
     ] + (get_libkineto_api_srcs() if with_api else [])
 
 def get_libkineto_cpu_only_srcs(with_api = True):
diff --git a/libkineto/src/CudaDeviceProperties.cpp b/libkineto/src/CudaDeviceProperties.cpp
new file mode 100644
index 000000000..a2c8d030b
--- /dev/null
+++ b/libkineto/src/CudaDeviceProperties.cpp
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ * All rights reserved.
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "CudaDeviceProperties.h"
+
+#include <vector>
+
+#include <cuda_runtime.h>
+#include <cuda_occupancy.h>
+
+namespace KINETO_NAMESPACE {
+
+std::vector<cudaOccDeviceProp> createOccDeviceProps() {
+  std::vector<cudaOccDeviceProp> occProps;
+  int device_count;
+  cudaError_t error_id = cudaGetDeviceCount(&device_count);
+  // Return empty vector if error.
+  if (error_id != cudaSuccess) {
+    return occProps;
+  }
+  for (int i = 0; i < device_count; ++i) {
+    cudaDeviceProp prop;
+    error_id = cudaGetDeviceProperties(&prop, i);
+    // Return empty vector if any device property fail to get.
+    if (error_id != cudaSuccess) {
+      return occProps;
+    }
+    cudaOccDeviceProp occProp;
+    occProp = prop;
+    occProps.push_back(occProp);
+  }
+  return occProps;
+}
+
+const std::vector<cudaOccDeviceProp>& occDeviceProps() {
+  static std::vector<cudaOccDeviceProp> occProps = createOccDeviceProps();
+  return occProps;
+}
+
+float getKernelOccupancy(uint32_t deviceId, uint16_t registersPerThread, 
+                         int32_t staticSharedMemory, int32_t dynamicSharedMemory,
+                         int32_t blockX, int32_t blockY, int32_t blockZ) {
+  // Calculate occupancy
+  float occupancy = -1.0;
+  const std::vector<cudaOccDeviceProp> &occProps = occDeviceProps();
+  if (deviceId < occProps.size()) {
+    cudaOccFuncAttributes occFuncAttr;
+    occFuncAttr.maxThreadsPerBlock = INT_MAX;
+    occFuncAttr.numRegs = registersPerThread;
+    occFuncAttr.sharedSizeBytes = staticSharedMemory;
+    occFuncAttr.partitionedGCConfig = PARTITIONED_GC_OFF;
+    occFuncAttr.shmemLimitConfig = FUNC_SHMEM_LIMIT_DEFAULT;
+    occFuncAttr.maxDynamicSharedSizeBytes = 0;
+    const cudaOccDeviceState occDeviceState = {};
+    int blockSize = blockX * blockY * blockZ;
+    size_t dynamicSmemSize = dynamicSharedMemory;
+    cudaOccResult occ_result;
+    cudaOccError status = cudaOccMaxActiveBlocksPerMultiprocessor(
+          &occ_result, &occProps[deviceId], &occFuncAttr, &occDeviceState,
+          blockSize, dynamicSmemSize);
+    if (status == CUDA_OCC_SUCCESS) {
+      occupancy = occ_result.activeBlocksPerMultiprocessor * blockSize /
+          (float) occProps[deviceId].maxThreadsPerMultiprocessor;
+    }
+  }
+  return occupancy;
+}
+
+} // namespace KINETO_NAMESPACE
diff --git a/libkineto/src/CudaDeviceProperties.h b/libkineto/src/CudaDeviceProperties.h
new file mode 100644
index 000000000..0e95058a4
--- /dev/null
+++ b/libkineto/src/CudaDeviceProperties.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ * All rights reserved.
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+namespace KINETO_NAMESPACE {
+
+float getKernelOccupancy(uint32_t deviceId, uint16_t registersPerThread,
+                         int32_t staticSharedMemory, int32_t dynamicSharedMemory,
+                         int32_t blockX, int32_t blockY, int32_t blockZ);
+
+} // namespace KINETO_NAMESPACE
diff --git a/libkineto/src/output_json.cpp b/libkineto/src/output_json.cpp
index 13b764ced..d74a6c26d 100644
--- a/libkineto/src/output_json.cpp
+++ b/libkineto/src/output_json.cpp
@@ -17,6 +17,7 @@
 #include "CuptiActivity.h"
 #include "CuptiActivity.tpp"
 #include "CuptiActivityInterface.h"
+#include "CudaDeviceProperties.h"
 #endif // HAS_CUPTI
 #include "Demangle.h"
 #include "TraceSpan.h"
@@ -311,12 +312,16 @@ void ChromeTraceLogger::handleGpuActivity(
   const CUpti_ActivityKernel4* kernel = &activity.raw();
   const TraceActivity& ext = *activity.linkedActivity();
   constexpr int threads_per_warp = 32;
-  float warps_per_sm = -1.0;
+  float blocks_per_sm = -1.0;
   if (smCount_) {
-    warps_per_sm = (kernel->gridX * kernel->gridY * kernel->gridZ) *
-        (kernel->blockX * kernel->blockY * kernel->blockZ) /
-        (float) threads_per_warp / smCount_;
+    blocks_per_sm = (kernel->gridX * kernel->gridY * kernel->gridZ) / (float) smCount_;
   }
+
+  // Calculate occupancy
+  float occupancy = KINETO_NAMESPACE::getKernelOccupancy(kernel->deviceId, kernel->registersPerThread,
+                                       kernel->staticSharedMemory, kernel->dynamicSharedMemory,
+                                       kernel->blockX, kernel->blockY, kernel->blockZ);
+
   // clang-format off
   traceOf_ << fmt::format(R"JSON(
   {{
@@ -326,9 +331,10 @@ void ChromeTraceLogger::handleGpuActivity(
       "stream": {}, "correlation": {}, "external id": {},
       "registers per thread": {},
       "shared memory": {},
-      "warps per SM": {},
+      "blocks per SM": {},
       "grid": [{}, {}, {}],
-      "block": [{}, {}, {}]
+      "block": [{}, {}, {}],
+      "occupancy": {}
     }}
   }},)JSON",
       traceActivityJson(activity, "stream "),
@@ -337,9 +343,10 @@ void ChromeTraceLogger::handleGpuActivity(
       kernel->streamId, kernel->correlationId, ext.correlationId(),
       kernel->registersPerThread,
       kernel->staticSharedMemory + kernel->dynamicSharedMemory,
-      warps_per_sm,
+      blocks_per_sm,
       kernel->gridX, kernel->gridY, kernel->gridZ,
-      kernel->blockX, kernel->blockY, kernel->blockZ);
+      kernel->blockX, kernel->blockY, kernel->blockZ,
+      occupancy);
   // clang-format on
 
   handleLinkEnd(activity);