diff --git a/data/json/items/melee/knives_kitchen.json b/data/json/items/melee/knives_kitchen.json
index dfd089c8b249d..8d82e8e394ac7 100644
--- a/data/json/items/melee/knives_kitchen.json
+++ b/data/json/items/melee/knives_kitchen.json
@@ -47,8 +47,8 @@
     "description": "This is a short-bladed knife with a sharp blade, made for fine controlled cuts to vegetables without using a cutting board.",
     "copy-from": "base_kitchen_knife",
     "looks_like": "knife_steak",
-    "weight": "100 g",
-    "volume": "250 ml",
+    "weight": "50 g",
+    "volume": "30 ml",
     "price": 250,
     "to_hit": -1,
     "bashing": 1,
diff --git a/data/json/items/melee/swords_and_blades.json b/data/json/items/melee/swords_and_blades.json
index d9439ae330a51..6dec62fcaf5e2 100644
--- a/data/json/items/melee/swords_and_blades.json
+++ b/data/json/items/melee/swords_and_blades.json
@@ -52,8 +52,8 @@
     "category": "weapons",
     "name": "switchblade",
     "description": "This is a long and thin knife with a spring-loaded blade that rests inside the handle while not in use.",
-    "weight": "464 g",
-    "volume": 0,
+    "weight": "100 g",
+    "volume": "50 ml",
     "price": 2000,
     "to_hit": -2,
     "cutting": 16,
@@ -69,7 +69,7 @@
     "type": "TOOL",
     "name": { "str": "folding knife", "str_pl": "folding knives" },
     "description": "This is a small folding knife, with a locking blade and a pocket clip.  Not as good a weapon as a solid fixed-blade knife, but better than a penknife.",
-    "weight": "256 g",
+    "weight": "80 g",
     "volume": "40 ml",
     "price": 1500,
     "bashing": 1,
@@ -187,8 +187,8 @@
     "name": { "str": "Swiss Army knife", "str_pl": "Swiss Army knives" },
     "//": "The swiss army knife is a bit more of a knife than a toolkit.",
     "description": "An iconic pocket knife imported from Europe.  Its red plastic handle conceals many small tools.",
-    "weight": "246 g",
-    "volume": "5 ml",
+    "weight": "120 g",
+    "volume": "60 ml",
     "price": 3000,
     "to_hit": -2,
     "cutting": 6,
diff --git a/data/json/items/tool/knives.json b/data/json/items/tool/knives.json
index fee391477ed94..964a07cec24a5 100644
--- a/data/json/items/tool/knives.json
+++ b/data/json/items/tool/knives.json
@@ -54,8 +54,8 @@
     "type": "TOOL",
     "name": { "str": "pocket knife", "str_pl": "pocket knives" },
     "description": "This is a small pocket knife.  It isn't great for combat, but it's better than nothing.  It's sharp enough to butcher with.",
-    "weight": "141 g",
-    "volume": "5 ml",
+    "weight": "20 g",
+    "volume": "10 ml",
     "price": 1000,
     "to_hit": -2,
     "cutting": 7,
diff --git a/data/json/items/tool/workshop.json b/data/json/items/tool/workshop.json
index f2fcf0fc70cc3..c85ec7af54639 100644
--- a/data/json/items/tool/workshop.json
+++ b/data/json/items/tool/workshop.json
@@ -531,8 +531,8 @@
     "name": "multi-tool",
     "//": "The multi-tool is a bit more of a toolkit than a knife.",
     "description": "A cleverly designed all-in-one tool which combines several smaller tools into the handles of a pair of pliers.",
-    "weight": "494 g",
-    "volume": "250 ml",
+    "weight": "250 g",
+    "volume": "70 ml",
     "price": 3000,
     "to_hit": -4,
     "bashing": 1,