diff --git a/mbs_results/utilities/csw_to_spp_converter.py b/mbs_results/utilities/csw_to_spp_converter.py
new file mode 100644
index 00000000..bb4383bd
--- /dev/null
+++ b/mbs_results/utilities/csw_to_spp_converter.py
@@ -0,0 +1,104 @@
+import fnmatch
+from os import listdir
+from os.path import isfile, join
+
+import pandas as pd
+from utils import convert_column_to_datetime
+
+
+def get_patern_df(filepath: str, pattern: str) -> pd.DataFrame:
+    """Loads as pd dataframe all csv files with pattern.
+
+    Parameters
+    ----------
+    filepath : str
+        Filepath to folder containg desired files.
+    pattern : str
+        Regex pattern to filter files in the folder based on name.
+
+    Returns
+    -------
+    pd.DataFrame
+        Dataframe containg data from all selected files.
+    """
+
+    filenames = [
+        filename for filename in listdir(filepath) if isfile(join(filepath, filename))
+    ]
+    filenames = fnmatch.filter(filenames, pattern)
+    df_list = [pd.read_csv(filepath + "/" + filename) for filename in filenames]
+    df = pd.concat(df_list, ignore_index=True)
+
+    return df
+
+
+def get_qv_and_cp_data(
+    cp_path: str,
+    qv_path: str,
+) -> pd.DataFrame:
+    """Reads and joins qv and cp data.
+
+    Parameters
+    ----------
+    cp_path : str
+        Filepath to folder containing cp data.
+    qv_path : str
+        Filepath to folder containing qv data.
+
+    Returns
+    -------
+    pd.DataFrame
+        Dataframe containing combined qv and cp data.
+    """
+
+    qv_df = get_patern_df(qv_path, "qv*.csv")
+    cp_df = get_patern_df(cp_path, "cp*.csv")
+
+    qv_and_cp = pd.merge(qv_df, cp_df, how="left", on=["period", "reference"])
+
+    return qv_and_cp
+
+
+def csw_to_spp(
+    cp_path: str,
+    qv_path: str,
+    output_path: str,
+    column_map: dict,
+    period: str,
+    period_range: int,
+) -> None:
+    """Combines cp and qv files, filters and renames columns based on a mapping, and
+    then saves the output as a json file.
+
+    Parameters
+    ----------
+    cp_path : str
+        Filepath to folder containing cp data.
+    qv_path : str
+        Filepath to folder containing qv data.
+    output_path : str
+        Filepath to save json file.
+    column_map : dict
+        Dictionary containing desired columns from qv and cp data as keys and their
+        desired names as values.
+    period : str
+        Date to filter output on (YYYY-MM-DD).
+    period_range : str
+        Number of months from the period and previous to include in the output.
+    """
+    qv_and_cp = get_qv_and_cp_data(cp_path, qv_path)
+
+    qv_and_cp["period"] = convert_column_to_datetime(qv_and_cp["period"])
+
+    period = pd.Timestamp(period)
+
+    qv_and_cp = qv_and_cp[
+        (qv_and_cp["period"] > period - pd.DateOffset(months=period_range))
+        & (qv_and_cp["period"] <= period)
+    ]
+
+    qv_and_cp["period"] = qv_and_cp["period"].dt.strftime("%Y%m")
+
+    qv_and_cp = qv_and_cp[column_map.keys()].rename(columns=column_map)
+
+    qv_and_cp.to_json(f"{output_path}_{period.strftime('%Y%m')}_{period_range}.json")