diff --git a/pkgs/desktops/lomiri/applications/lomiri-calculator-app/default.nix b/pkgs/desktops/lomiri/applications/lomiri-calculator-app/default.nix
new file mode 100644
index 000000000000..5e7744072382
--- /dev/null
+++ b/pkgs/desktops/lomiri/applications/lomiri-calculator-app/default.nix
@@ -0,0 +1,106 @@
+{
+  stdenv,
+  lib,
+  fetchFromGitLab,
+  fetchpatch,
+  gitUpdater,
+  cmake,
+  gettext,
+  lomiri-ui-toolkit,
+  pkg-config,
+  qqc2-suru-style,
+  qtbase,
+  wrapQtAppsHook,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "lomiri-calculator-app";
+  version = "4.0.2";
+
+  src = fetchFromGitLab {
+    owner = "ubports";
+    repo = "development/apps/lomiri-calculator-app";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-NyLEis+rIx2ELUiGrGCeFX/tlt43UgPBkb9aUs1tkgk=";
+  };
+
+  patches = [
+    # Remove when version > 4.0.2
+    (fetchpatch {
+      name = "0001-lomiri-calculator-app-Fix-GNUInstallDirs-variable-concatenations.patch";
+      url = "https://gitlab.com/ubports/development/apps/lomiri-calculator-app/-/commit/0bd6ef6c3470bcecf90a88e1e5568a5ce5ad6d06.patch";
+      hash = "sha256-2FCLZ/LY3xTPGDmX+M8LiqlbcNQJu5hulkOf+V+3hWY=";
+    })
+
+    # Remove when version > 4.0.2
+    # Must apply separately because merge has hunk with changes to new file before hunk that inits said file
+    (fetchpatch {
+      name = "0002-lomiri-calculator-app-Migrate-to-C++-app.patch";
+      url = "https://gitlab.com/ubports/development/apps/lomiri-calculator-app/-/commit/035e5b8000ad1c8149a6b024fa8fed2667fbb659.patch";
+      hash = "sha256-2BTFOrH/gjIzXBmnTPMi+mPpUA7e/+6O/E3pdxhjZYQ=";
+    })
+    (fetchpatch {
+      name = "0003-lomiri-calculator-app-Call-i18n.bindtextdomain.patch";
+      url = "https://gitlab.com/ubports/development/apps/lomiri-calculator-app/-/commit/7cb5e56958e41a8f7a51e00d81d9b2bc24de32b0.patch";
+      hash = "sha256-k/Civ0+SCNDDok9bUdb48FKC+LPlM13ASFP6CbBvBVs=";
+    })
+  ];
+
+  postPatch =
+    # We don't want absolute paths in desktop files
+    ''
+      substituteInPlace CMakeLists.txt \
+        --replace-fail 'ICON ''${LOMIRI-CALCULATOR-APP_DIR}/''${ICON_FILE}' 'ICON ''${APP_HARDCODE}' \
+        --replace-fail 'SPLASH ''${LOMIRI-CALCULATOR-APP_DIR}/''${SPLASH_FILE}' 'SPLASH lomiri-app-launch/splash/''${APP_HARDCODE}.svg'
+    ''
+    + lib.optionalString (!finalAttrs.finalPackage.doCheck) ''
+      substituteInPlace CMakeLists.txt \
+        --replace-fail 'add_subdirectory(tests)' ""
+    '';
+
+  strictDeps = true;
+
+  nativeBuildInputs = [
+    cmake
+    gettext
+    pkg-config
+    wrapQtAppsHook
+  ];
+
+  buildInputs = [
+    qtbase
+
+    # QML
+    lomiri-ui-toolkit
+    qqc2-suru-style
+  ];
+
+  cmakeFlags = [
+    (lib.cmakeBool "CLICK_MODE" false)
+    (lib.cmakeBool "INSTALL_TESTS" false)
+  ];
+
+  # No tests we can actually run (just autopilot)
+  doCheck = false;
+
+  postInstall = ''
+    mkdir -p $out/share/{icons/hicolor/scalable/apps,lomiri-app-launch/splash}
+
+    ln -s $out/share/{lomiri-calculator-app,icons/hicolor/scalable/apps}/lomiri-calculator-app.svg
+    ln -s $out/share/{lomiri-calculator-app/lomiri-calculator-app-splash.svg,lomiri-app-launch/splash/lomiri-calculator-app.svg}
+  '';
+
+  passthru = {
+    updateScript = gitUpdater { rev-prefix = "v"; };
+  };
+
+  meta = {
+    description = "Powerful and easy to use calculator for Ubuntu Touch, with calculations history and formula validation";
+    homepage = "https://gitlab.com/ubports/development/apps/lomiri-calculator-app";
+    changelog = "https://gitlab.com/ubports/development/apps/lomiri-calculator-app/-/blob/v${finalAttrs.version}/ChangeLog";
+    license = lib.licenses.gpl3Only;
+    mainProgram = "lomiri-calculator-app";
+    maintainers = lib.teams.lomiri.members;
+    platforms = lib.platforms.linux;
+  };
+})
diff --git a/pkgs/desktops/lomiri/default.nix b/pkgs/desktops/lomiri/default.nix
index 03d8e9451bbb..1a84a9024c8f 100644
--- a/pkgs/desktops/lomiri/default.nix
+++ b/pkgs/desktops/lomiri/default.nix
@@ -9,6 +9,7 @@ let
   in {
     #### Core Apps
     lomiri = callPackage ./applications/lomiri { };
+    lomiri-calculator-app = callPackage ./applications/lomiri-calculator-app { };
     lomiri-filemanager-app = callPackage ./applications/lomiri-filemanager-app { };
     lomiri-system-settings-unwrapped = callPackage ./applications/lomiri-system-settings { };
     lomiri-system-settings-security-privacy = callPackage ./applications/lomiri-system-settings/plugins/lomiri-system-settings-security-privacy.nix { };