diff --git a/dat/wizhelp b/dat/wizhelp
index 88e1b3417..1945214b0 100644
--- a/dat/wizhelp
+++ b/dat/wizhelp
@@ -30,6 +30,7 @@ Debug-Mode Quick Reference:
 #wizloadlua     == load and execute a lua script
 #wizmakemap     == recreate the current dungeon level
 #wizmondiff     == [Opt] check for discrepancies in monster difficulty ratings
+#wizobjprobs    == [Opt] list actual probabilities of item generation
 #wizrumorcheck  == validate rumor indexing; also show first, second, and last
                    random engravings, epitaphs, and hallucinatory monsters
 #wizseenv       == show map locations' seen vectors
diff --git a/include/extern.h b/include/extern.h
index 52358357e..998e7698c 100644
--- a/include/extern.h
+++ b/include/extern.h
@@ -3854,6 +3854,7 @@ extern void wizcustom_callback(winid win, int glyphnum, char *id);
 #if (NH_DEVEL_STATUS != NH_STATUS_RELEASED) || defined(DEBUG)
 extern int wiz_display_macros(void);
 extern int wiz_mon_diff(void);
+extern int wiz_objprobs(void);
 #endif
 extern void sanity_check(void);
 
diff --git a/src/cmd.c b/src/cmd.c
index b10a017ba..b9cd4c799 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -1956,6 +1956,10 @@ struct ext_func_tab extcmdlist[] = {
               wiz_load_splua, IFBURIED | WIZMODECMD | NOFUZZERCMD, NULL },
     { '\0',   "wizloadlua", "load and execute a lua script",
               wiz_load_lua, IFBURIED | WIZMODECMD | NOFUZZERCMD, NULL },
+#if (NH_DEVEL_STATUS != NH_STATUS_RELEASED) || defined(DEBUG)
+    { '\0',   "wizobjprobs", "list object generation probabilities",
+              wiz_objprobs, IFBURIED | WIZMODECMD, NULL },
+#endif
     { '\0',   "wizmakemap", "recreate the current level",
               wiz_makemap, IFBURIED | WIZMODECMD, NULL },
     { C('f'), "wizmap", "map the level",
diff --git a/src/wizcmds.c b/src/wizcmds.c
index 31cb338cc..b045578b8 100644
--- a/src/wizcmds.c
+++ b/src/wizcmds.c
@@ -1776,9 +1776,7 @@ wiz_display_macros(void)
     destroy_nhwindow(win);
     return ECMD_OK;
 }
-#endif /* (NH_DEVEL_STATUS != NH_STATUS_RELEASED) || defined(DEBUG) */
 
-#if (NH_DEVEL_STATUS != NH_STATUS_RELEASED) || defined(DEBUG)
 /* the #wizmondiff command */
 int
 wiz_mon_diff(void)
@@ -1820,6 +1818,46 @@ wiz_mon_diff(void)
     destroy_nhwindow(win);
     return ECMD_OK;
 }
+
+/* the #wizobjprobs command */
+int
+wiz_objprobs(void)
+{
+    int win;
+    char buf[BUFSZ];
+    int probsum[MAXOCLASSES];
+    int otyp;
+    int oclass = objects[FIRST_OBJECT].oc_class;
+    memset(probsum, 0, sizeof probsum);
+
+    for (otyp = FIRST_OBJECT; otyp < NUM_OBJECTS; otyp++) {
+        probsum[(int) objects[otyp].oc_class] += objects[otyp].oc_prob;
+    }
+
+    win = create_nhwindow(NHW_TEXT);
+    for (otyp = FIRST_OBJECT; otyp < NUM_OBJECTS; otyp++) {
+        /* placeholders for extra descriptions aren't generatable objects */
+        if (!OBJ_NAME(objects[otyp]))
+            continue;
+
+        if ((int) objects[otyp].oc_class != oclass) {
+            putstr(win, 0, "");
+        }
+        oclass = objects[otyp].oc_class;
+
+        Snprintf(buf, sizeof buf, "%4d / %4d (%6.2f%%): %s",
+                 objects[otyp].oc_prob,
+                 probsum[oclass],
+                 (float) objects[otyp].oc_prob * 100.f /
+                 (float) probsum[oclass],
+                 OBJ_NAME(objects[otyp]));
+        putstr(win, 0, buf);
+    }
+    display_nhwindow(win, FALSE);
+    destroy_nhwindow(win);
+
+    return ECMD_OK;
+}
 #endif /* (NH_DEVEL_STATUS != NH_STATUS_RELEASED) || defined(DEBUG) */
 
 /* #migratemons command */