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diff --git a/runtimes/pure_arm_compute/src/internal/nnapi/feature/Utils.h b/runtimes/pure_arm_compute/src/internal/nnapi/feature/Utils.h
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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. 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.
+ */
+
+#ifndef __INTERNAL_NNAPI_FEATURE_UTILS_H__
+#define __INTERNAL_NNAPI_FEATURE_UTILS_H__
+
+#include "util/feature/Shape.h"
+
+namespace internal
+{
+namespace nnapi
+{
+namespace feature
+{
+
+inline uint32_t index_of(const ::nnfw::util::feature::Shape &shape, uint32_t ch, uint32_t row,
+ uint32_t col)
+{
+ uint32_t res = 0;
+
+ // NNAPI uses NHWC ordering
+ res += row * shape.W * shape.C;
+ res += col * shape.C;
+ res += ch;
+
+ return res;
+}
+
+inline uint32_t index_of(const ::nnfw::util::feature::Shape &shape, uint32_t batch, uint32_t ch,
+ uint32_t row, uint32_t col)
+{
+ uint32_t res = 0;
+
+ // NNAPI uses NHWC ordering
+ res += batch * shape.H * shape.W * shape.C;
+ res += row * shape.W * shape.C;
+ res += col * shape.C;
+ res += ch;
+
+ return res;
+}
+
+} // namespace feature
+} // namespace nnapi
+} // namespace internal
+
+#endif // __INTERNAL_NNAPI_FEATURE_UTILS_H__