diff --git a/steam.py b/steam.py
new file mode 100644
index 00000000..be68b1a2
--- /dev/null
+++ b/steam.py
@@ -0,0 +1,9 @@
+def convert_sid_1_3(steamid: int, group=False):
+    """Convert SteamID1 to SteamID3"""
+    accuniverse = steamid % 2
+    if group:
+        acctype = 0x0170000000000000
+    else:
+        acctype = 0x0110000100000000
+    accid = (steamid - acctype - accuniverse) / 2
+    return accid