diff --git a/core/matrix/batch_struct.hpp b/core/matrix/batch_struct.hpp
index aa48281b3d5..558789ba99f 100644
--- a/core/matrix/batch_struct.hpp
+++ b/core/matrix/batch_struct.hpp
@@ -32,6 +32,11 @@ struct batch_item {
     const index_type* row_ptrs;
     index_type num_rows;
     index_type num_cols;
+
+    inline size_type get_single_item_num_nnz() const
+    {
+        return static_cast<size_type>(num_nnz_per_item);
+    }
 };
 
 
@@ -75,6 +80,11 @@ struct batch_item {
     int32 stride;
     int32 num_rows;
     int32 num_cols;
+
+    inline size_type get_single_item_num_nnz() const
+    {
+        return static_cast<size_type>(stride * num_rows);
+    }
 };
 
 
@@ -119,6 +129,11 @@ struct batch_item {
     index_type num_rows;
     index_type num_cols;
     index_type num_stored_elems_per_row;
+
+    inline size_type get_single_item_num_nnz() const
+    {
+        return static_cast<size_type>(stride * num_stored_elems_per_row);
+    }
 };
 
 
diff --git a/core/preconditioner/batch_jacobi.cpp b/core/preconditioner/batch_jacobi.cpp
index 233062e4bd0..57a41bbf100 100644
--- a/core/preconditioner/batch_jacobi.cpp
+++ b/core/preconditioner/batch_jacobi.cpp
@@ -105,7 +105,7 @@ void Jacobi<ValueType, IndexType>::generate_precond(
         num_blocks_, parameters_.block_pointers.get_const_data(),
         row_part_of_which_block_info_.get_data()));
 
-    // Note: Row-major order offers advanatge in terms of
+    // Note: Row-major order offers advantage in terms of
     // performance in both preconditioner generation and application for both
     // reference and cuda backend. Note: The pattern blocks in block_pattern are
     // also stored in a similar way.
diff --git a/include/ginkgo/core/preconditioner/batch_jacobi.hpp b/include/ginkgo/core/preconditioner/batch_jacobi.hpp
index de0da878c25..c827e1301bd 100644
--- a/include/ginkgo/core/preconditioner/batch_jacobi.hpp
+++ b/include/ginkgo/core/preconditioner/batch_jacobi.hpp
@@ -324,7 +324,7 @@ class Jacobi : public EnableBatchLinOp<Jacobi<ValueType, IndexType>> {
     /**
      * Creates a Jacobi preconditioner from a matrix using a Jacobi::Factory.
      *
-     * @param factory  the factory to use to create the preconditoner
+     * @param factory  the factory to use to create the preconditioner
      * @param system_matrix  the matrix this preconditioner should be created
      *                       from
      */
@@ -348,7 +348,7 @@ class Jacobi : public EnableBatchLinOp<Jacobi<ValueType, IndexType>> {
     }
 
     /**
-     * Generates the preconditoner.
+     * Generates the preconditioner.
      *
      */
     void generate_precond(const BatchLinOp* const system_matrix);