diff --git a/pkgs/by-name/pi/piday25/package.nix b/pkgs/by-name/pi/piday25/package.nix
new file mode 100644
index 000000000000..5fdc920df1ad
--- /dev/null
+++ b/pkgs/by-name/pi/piday25/package.nix
@@ -0,0 +1,42 @@
+{
+  lib,
+  rustPlatform,
+  fetchFromGitHub,
+  nix-update-script,
+}:
+
+rustPlatform.buildRustPackage {
+  pname = "piday25";
+  version = "0-unstable-2025-03-13";
+
+  src = fetchFromGitHub {
+    owner = "elkasztano";
+    repo = "piday25";
+    rev = "68b417a3016c58a2948cb3b39c9bde985d82bdb8";
+    hash = "sha256-58ZBRmB990Tp+/nkuRZA+8cjCRFUBzdzu93Sk5uvKOE=";
+  };
+
+  useFetchCargoVendor = true;
+  cargoHash = "sha256-3uztB5/VevFyEz3S+VlAUPgDrNDJcwaTnHuXXYAX+MY=";
+
+  # upstream does not have any tests
+  doInstallCheck = true;
+  installCheckPhase = ''
+    runHook preInstallCheck
+
+    $out/bin/piday25 > result
+    diff -U3 --color=auto <(head -c12 result) <(echo -n 3.1415926535)
+
+    runHook postInstallCheck
+  '';
+
+  passthru.updateScript = nix-update-script { extraArgs = [ "--version=branch=main" ]; };
+
+  meta = {
+    description = "Multithreaded implementation of the Chudnovsky algorithm to calculate Pi";
+    homepage = "https://github.com/elkasztano/piday25";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ defelo ];
+    mainProgram = "piday25";
+  };
+}