diff --git a/include/aare/CtbRawFile.hpp b/include/aare/CtbRawFile.hpp
index ebcfa46..f1c992e 100644
--- a/include/aare/CtbRawFile.hpp
+++ b/include/aare/CtbRawFile.hpp
@@ -28,6 +28,7 @@ class CtbRawFile {
 
     size_t image_size_in_bytes() const;
     size_t frames_in_file() const;
+    size_t total_frames() const;
 
     RawMasterFile master() const;
 
diff --git a/python/src/bind_RawFile.hpp b/python/src/bind_RawFile.hpp
index c31a8c3..85ef155 100644
--- a/python/src/bind_RawFile.hpp
+++ b/python/src/bind_RawFile.hpp
@@ -280,6 +280,7 @@ void define_raw_file_io_bindings(py::module &m) {
         .def("tell", &RawFile::tell, R"(
             Return the current frame number.)")
         .def_property_readonly("total_frames", &RawFile::total_frames)
+        .def("__len__", &RawFile::total_frames)
         .def("rows", static_cast<size_t (RawFile::*)() const>(&RawFile::rows))
         .def(
             "rows",
diff --git a/python/src/ctb_raw_file.hpp b/python/src/ctb_raw_file.hpp
index 6deff4d..5570254 100644
--- a/python/src/ctb_raw_file.hpp
+++ b/python/src/ctb_raw_file.hpp
@@ -226,5 +226,7 @@ void define_ctb_raw_file_io_bindings(py::module &m) {
         .def_property_readonly("image_size_in_bytes",
                                &CtbRawFile::image_size_in_bytes)
 
-        .def_property_readonly("frames_in_file", &CtbRawFile::frames_in_file);
+        .def_property_readonly("frames_in_file", &CtbRawFile::frames_in_file)
+        .def_property_readonly("total_frames", &CtbRawFile::total_frames)
+        .def("__len__", &CtbRawFile::total_frames);
 }
diff --git a/python/src/file.hpp b/python/src/file.hpp
index 3be4ae2..b602673 100644
--- a/python/src/file.hpp
+++ b/python/src/file.hpp
@@ -60,6 +60,7 @@ void define_file_io_bindings(py::module &m) {
         .def("seek", &File::seek)
         .def("tell", &File::tell)
         .def_property_readonly("total_frames", &File::total_frames)
+        .def("__len__", &File::total_frames)
         .def_property_readonly("rows", &File::rows)
         .def_property_readonly("cols", &File::cols)
         .def_property_readonly("bitdepth", &File::bitdepth)
diff --git a/python/src/jungfrau_data_file.hpp b/python/src/jungfrau_data_file.hpp
index 9b0f188..44ecd90 100644
--- a/python/src/jungfrau_data_file.hpp
+++ b/python/src/jungfrau_data_file.hpp
@@ -72,6 +72,7 @@ void define_jungfrau_data_file_io_bindings(py::module &m) {
         .def_property_readonly("bitdepth", &JungfrauDataFile::bitdepth)
         .def_property_readonly("current_file", &JungfrauDataFile::current_file)
         .def_property_readonly("total_frames", &JungfrauDataFile::total_frames)
+        .def("__len__", &JungfrauDataFile::total_frames)
         .def_property_readonly("n_files", &JungfrauDataFile::n_files)
         .def("read_frame", &read_dat_frame,
              R"(
diff --git a/src/CtbRawFile.cpp b/src/CtbRawFile.cpp
index f22b2f3..260ab66 100644
--- a/src/CtbRawFile.cpp
+++ b/src/CtbRawFile.cpp
@@ -57,6 +57,8 @@ size_t CtbRawFile::image_size_in_bytes() const {
 
 size_t CtbRawFile::frames_in_file() const { return m_master.frames_in_file(); }
 
+size_t CtbRawFile::total_frames() const { return m_master.frames_in_file(); }
+
 RawMasterFile CtbRawFile::master() const { return m_master; }
 
 void CtbRawFile::find_subfiles() {