diff --git a/terratorch/models/backbones/utils.py b/terratorch/models/backbones/utils.py
index e415e9b4..cb680f76 100644
--- a/terratorch/models/backbones/utils.py
+++ b/terratorch/models/backbones/utils.py
@@ -19,12 +19,14 @@ def _estimate_in_chans(model_bands: list[HLSBands] | list[str] | tuple[int, int]
     is_sublist, requires_special_eval = _are_sublists_of_int(model_bands)
 
     # Bands as intervals limited by integers
+    # The bands numbering follows the Python convention (starts with 0)
+    # and includes the extrema (so the +1 in order to include the last band)
     if requires_special_eval:
 
         if is_sublist:
-            in_chans = sum([i[-1] - i[0] for i in model_bands])
+            in_chans = sum([i[-1] - i[0] + 1 for i in model_bands])
         else:
-            in_chans = model_bands[-1] - model_bands[0]
+            in_chans = model_bands[-1] - model_bands[0] + 1
     else:
         in_chans = len(model_bands)