diff --git a/Content.Shared/EntryPoint.cs b/Content.Shared/EntryPoint.cs
index 32829309af..c99665d271 100644
--- a/Content.Shared/EntryPoint.cs
+++ b/Content.Shared/EntryPoint.cs
@@ -14,9 +14,6 @@ namespace Content.Shared
 {
     public class EntryPoint : GameShared
     {
-        // If you want to change your codebase's language, do it here.
-        private const string Culture = "en-US";
-
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
         [Dependency] private readonly ITileDefinitionManager _tileDefinitionManager = default!;
         [Dependency] private readonly IResourceManager _resourceManager = default!;
@@ -25,8 +22,7 @@ namespace Content.Shared
         {
             IoCManager.InjectDependencies(this);
 
-            // Default to en-US.
-            Loc.LoadCulture(_resourceManager, new CultureInfo(Culture));
+            Localization.Init();
         }
 
         public override void Init()
diff --git a/Content.Shared/Localization.cs b/Content.Shared/Localization.cs
new file mode 100644
index 0000000000..290ef13ed7
--- /dev/null
+++ b/Content.Shared/Localization.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Globalization;
+using Robust.Shared.ContentPack;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+
+namespace Content.Shared
+{
+    public static class Localization
+    {
+        // If you want to change your codebase's language, do it here.
+        private const string Culture = "en-US";
+
+        public static void Init()
+        {
+            var loc = IoCManager.Resolve<ILocalizationManager>();
+            var res = IoCManager.Resolve<IResourceManager>();
+
+            var culture = new CultureInfo(Culture);
+
+            loc.LoadCulture(res, culture);
+            loc.AddFunction(culture, "PRESSURE", FormatPressure);
+            loc.AddFunction(culture, "TOSTRING", args => FormatToString(culture, args));
+        }
+
+        private static ILocValue FormatToString(CultureInfo culture, LocArgs args)
+        {
+            var arg = args.Args[0];
+            var fmt = ((LocValueString) args.Args[1]).Value;
+
+            var obj = arg.Value;
+            if (obj is IFormattable formattable)
+                return new LocValueString(formattable.ToString(fmt, culture));
+
+            return new LocValueString(obj?.ToString() ?? "");
+        }
+
+        private static ILocValue FormatPressure(LocArgs args)
+        {
+            const int maxPlaces = 5; // Matches amount in _lib.ftl
+            var pressure = ((LocValueNumber) args.Args[0]).Value;
+
+            var places = 0;
+            while (pressure > 1000 && places < maxPlaces)
+            {
+                pressure /= 1000;
+                places += 1;
+            }
+
+            return new LocValueString(Loc.GetString("zzzz-fmt-pressure", ("divided", pressure), ("places", places)));
+        }
+    }
+}
diff --git a/Resources/Locale/en-US/_lib.ftl b/Resources/Locale/en-US/_lib.ftl
new file mode 100644
index 0000000000..36fbee046c
--- /dev/null
+++ b/Resources/Locale/en-US/_lib.ftl
@@ -0,0 +1,11 @@
+### Special messages used by internal localizer stuff.
+
+# Used internally by the PRESSURE() function.
+zzzz-fmt-pressure = { TOSTRING($divided, "G3") } { $places ->
+    [0] kPa
+    [1] MPa
+    [2] GPa
+    [3] TPa
+    [4] PBa
+    *[5] ???
+}