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diff --git a/utils/convert-genie-rw b/utils/convert-genie-rw
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+++ b/utils/convert-genie-rw
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+#!/usr/bin/env python
+# Copyright (c) 2020, Anthony Latorre <tlatorre at uchicago>
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program. If not, see <https://www.gnu.org/licenses/>.
+"""
+Script to do convert GENIE reweight ROOT files into HDF5 files. To run it just
+run:
+
+    $ ./convert-genie-rw [filename] -o [output filename]
+"""
+from __future__ import print_function, division
+import ROOT
+
+if __name__ == '__main__':
+    import argparse
+    import sys
+    import h5py
+    import numpy as np
+
+    parser = argparse.ArgumentParser("convert GENIE reweight files from ROOT -> HDF5")
+    parser.add_argument("filename", help="input filename")
+    parser.add_argument("-o", "--output", required=True, help="output filename")
+    args = parser.parse_args()
+
+    f = ROOT.TFile(args.filename)
+    weights = f.Get("weights")
+
+    weights.GetEntry(0)
+    nuniverses = len(weights.weights)
+
+    data = np.empty(weights.GetEntries()*nuniverses,dtype=[('run',np.int32),('evn',np.int32),('universe',np.int32),('weight',np.float32)])
+
+    for i, event in enumerate(weights):
+        for j in range(nuniverses):
+            data[i*nuniverses+j] = event.runnum, event.eventnum, j, event.weights[j]
+
+    f.Close()
+
+    with h5py.File(args.output,"w") as fout:
+        fout.create_dataset('weights',data=data)