diff --git a/pkgs/applications/science/misc/convertall/default.nix b/pkgs/applications/science/misc/convertall/default.nix
new file mode 100644
index 00000000000..63ed18c89b2
--- /dev/null
+++ b/pkgs/applications/science/misc/convertall/default.nix
@@ -0,0 +1,37 @@
+{ stdenv, fetchFromGitHub, python3, wrapQtAppsHook }:
+
+let
+  inherit (python3.pkgs) wrapPython pyqt5;
+in stdenv.mkDerivation rec {
+  pname = "convertall";
+  version = "0.8.0";
+
+  src = fetchFromGitHub {
+    owner = "doug-101";
+    repo = "ConvertAll";
+    rev = "v${version}";
+    sha256 = "02xxasgbjbivsbhyfpn3cpv52lscdx5kc95s6ns1dvnmdg0fpng0";
+  };
+
+  nativeBuildInputs = [ python3 wrapPython wrapQtAppsHook ];
+
+  propagatedBuildInputs = [ pyqt5 ];
+
+  installPhase = ''
+    python3 install.py -p $out -x
+  '';
+
+  postFixup = ''
+    buildPythonPath $out
+    patchPythonScript $out/share/convertall/convertall.py
+    makeQtWrapper $out/share/convertall/convertall.py $out/bin/convertall
+  '';
+
+  meta = with stdenv.lib; {
+    homepage = "https://convertall.bellz.org/";
+    description = "Graphical unit converter";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ orivej ];
+    platforms = pyqt5.meta.platforms;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index afa640a9f3f..9f881a85cca 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -26892,6 +26892,8 @@ in
     inherit (pkgs.gnome2) gtkglext;
   };
 
+  convertall = qt5.callPackage ../applications/science/misc/convertall { };
+
   cytoscape = callPackage ../applications/science/misc/cytoscape {
     jre = openjdk11;
   };