diff --git a/pkgs/development/python-modules/bitmath/default.nix b/pkgs/development/python-modules/bitmath/default.nix
new file mode 100644
index 00000000000..bb2e6046886
--- /dev/null
+++ b/pkgs/development/python-modules/bitmath/default.nix
@@ -0,0 +1,20 @@
+{ stdenv, buildPythonPackage, fetchPypi, isPy3k, progressbar231, progressbar33, mock }:
+
+buildPythonPackage rec {
+  pname = "bitmath";
+  version = "1.3.1.2";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1k8d1wmxqjc8cqzaixpxf45k6dl1kqhblr0g4wyjl0qa18q8wasd";
+  };
+
+  checkInputs = [ (if isPy3k then progressbar33 else progressbar231) mock ];
+
+  meta = with stdenv.lib; {
+    description = "Module for representing and manipulating file sizes with different prefix";
+    homepage = https://github.com/tbielawa/bitmath;
+    license = licenses.mit;
+    maintainers = with maintainers; [ twey ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 2ff548d561b..062729f12b7 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1003,6 +1003,8 @@ in {
   binwalk = self.binwalk_fun { };
   binwalk-full = self.binwalk_fun { visualizationSupport = true; pyqtgraph = self.pyqtgraph; };
 
+  bitmath = callPackage ../development/python-modules/bitmath { };
+
   caldavclientlibrary-asynk = buildPythonPackage rec {
     version = "asynkdev";
     name = "caldavclientlibrary-asynk-${version}";