diff --git a/depthcharge/data/spectrum_datasets.py b/depthcharge/data/spectrum_datasets.py
index 1944ea9..05038eb 100644
--- a/depthcharge/data/spectrum_datasets.py
+++ b/depthcharge/data/spectrum_datasets.py
@@ -4,6 +4,7 @@
 
 import copy
 import logging
+import math
 import uuid
 from collections.abc import Generator, Iterable
 from os import PathLike
@@ -178,6 +179,10 @@ def __del__(self) -> None:
         if self._tmpdir is not None:
             self._tmpdir.cleanup()
 
+    def __len__(self) -> int:
+        """The number of batches in the dataset."""
+        return math.ceil(self.n_spectra / self.batch_size)
+
     @property
     def n_spectra(self) -> int:
         """The number of spectra in the Lance dataset."""