diff --git a/data/json/items/generic/dining_kitchen.json b/data/json/items/generic/dining_kitchen.json
index 3a5888dad56ed..76f3294faf519 100644
--- a/data/json/items/generic/dining_kitchen.json
+++ b/data/json/items/generic/dining_kitchen.json
@@ -712,6 +712,7 @@
     "name": { "str": "rolling pin" },
     "description": "A stout piece of hardwood, turned and sanded smooth, with rounded handles at the ends.  This timeless kitchen tool also doubles as a very effective club.",
     "weight": "725 g",
+    "longest_side": "45 cm",
     "color": "brown",
     "symbol": "/",
     "material": [ "wood" ],
@@ -732,6 +733,7 @@
     "color": "light_gray",
     "weight": "550 g",
     "volume": "2100 ml",
+    "longest_side": "23 cm",
     "bashing": 6,
     "pocket_data": [
       {
@@ -754,6 +756,7 @@
     "color": "dark_gray",
     "weight": "3000 g",
     "volume": "2375 ml",
+    "longest_side": "24 cm",
     "bashing": 10,
     "pocket_data": [
       {
@@ -776,6 +779,7 @@
     "color": "light_red",
     "weight": "750 g",
     "volume": "2100 ml",
+    "longest_side": "23 cm",
     "bashing": 6,
     "to_hit": -2,
     "pocket_data": [
@@ -799,6 +803,7 @@
     "color": "white",
     "weight": "650 g",
     "volume": "2100 ml",
+    "longest_side": "23 cm",
     "bashing": 4,
     "pocket_data": [
       {
@@ -821,6 +826,7 @@
     "color": "light_gray",
     "weight": "2490 g",
     "volume": "12800 ml",
+    "longest_side": "25 cm",
     "bashing": 8,
     "pocket_data": [
       {
@@ -840,6 +846,7 @@
     "description": "A very large 25 liter pot, primarily meant for canning food in glass jars via the water bath method, though it can cook normal foods just as well.  Canning foods with it will require a lot of water.  If you're only canning a couple of jars at a time, you'd fill it up with rocks or something to displace the water above the lids.",
     "weight": "5625 g",
     "volume": "26250 ml",
+    "longest_side": "27 cm",
     "price": 20000,
     "to_hit": -2,
     "bashing": 10,
@@ -870,6 +877,7 @@
     "color": "dark_gray",
     "weight": "2628 g",
     "volume": "1335 ml",
+    "longest_side": "36 cm",
     "bashing": 12,
     "to_hit": -3,
     "pocket_data": [
@@ -896,6 +904,7 @@
     "looks_like": "pan",
     "weight": "528 g",
     "volume": "1 L",
+    "longest_side": "35 cm",
     "bashing": 8,
     "to_hit": -2,
     "pocket_data": [
@@ -922,6 +931,7 @@
     "looks_like": "pan",
     "weight": "628 g",
     "volume": "1050 ml",
+    "longest_side": "35 cm",
     "bashing": 7,
     "to_hit": -2,
     "pocket_data": [
@@ -944,6 +954,7 @@
     "description": "A sheet of metal crudely hammered into a cooking pot.  Good enough to cook food and boil water, but not as useful as proper cookware.",
     "weight": "6000 g",
     "volume": "1050 ml",
+    "longest_side": "20 cm",
     "price": 200,
     "price_postapoc": 5,
     "to_hit": 1,
@@ -971,6 +982,7 @@
     "description": "A cooking pot crudely hammered out of copper.  Good enough to cook food and boil water, but not as useful as proper cookware.",
     "weight": "884 g",
     "volume": "1050 ml",
+    "longest_side": "20 cm",
     "price": 200,
     "price_postapoc": 5,
     "to_hit": 1,
diff --git a/data/json/items/melee/knives_kitchen.json b/data/json/items/melee/knives_kitchen.json
index 17fa446312549..a350df9f42f33 100644
--- a/data/json/items/melee/knives_kitchen.json
+++ b/data/json/items/melee/knives_kitchen.json
@@ -18,6 +18,7 @@
     "copy-from": "base_kitchen_knife",
     "weight": "380 g",
     "volume": "300 ml",
+    "longest_side": "35 cm",
     "price": 3000,
     "price_postapoc": 50,
     "to_hit": { "grip": "weapon", "length": "short", "surface": "point", "balance": "neutral" },
@@ -36,6 +37,7 @@
     "copy-from": "base_kitchen_knife",
     "weight": "112 g",
     "volume": "100 ml",
+    "longest_side": "25 cm",
     "price": 250,
     "price_postapoc": 50,
     "to_hit": { "grip": "weapon", "length": "hand", "surface": "point", "balance": "neutral" },
@@ -55,6 +57,7 @@
     "looks_like": "knife_steak",
     "weight": "50 g",
     "volume": "30 ml",
+    "longest_side": "15 cm",
     "price": 250,
     "price_postapoc": 50,
     "to_hit": { "grip": "weapon", "length": "hand", "surface": "point", "balance": "neutral" },
@@ -74,6 +77,7 @@
     "ascii_picture": "knife_chef",
     "weight": "280 g",
     "volume": "200 ml",
+    "longest_side": "30 cm",
     "price": 1500,
     "price_postapoc": 100,
     "to_hit": { "grip": "weapon", "length": "short", "surface": "point", "balance": "neutral" },
@@ -93,6 +97,7 @@
     "looks_like": "knife_butcher",
     "weight": "280 g",
     "volume": "200 ml",
+    "longest_side": "30 cm",
     "price": 1500,
     "price_postapoc": 50,
     "to_hit": { "grip": "weapon", "length": "short", "surface": "point", "balance": "neutral" },
@@ -112,6 +117,7 @@
     "looks_like": "knife_butcher",
     "weight": "280 g",
     "volume": "200 ml",
+    "longest_side": "35 cm",
     "price": 500,
     "price_postapoc": 50,
     "bashing": 4,
@@ -131,6 +137,7 @@
     "looks_like": "knife_butcher",
     "weight": "250 g",
     "volume": "250 ml",
+    "longest_side": "30 cm",
     "price": 2500,
     "price_postapoc": 50,
     "to_hit": { "grip": "weapon", "length": "short", "surface": "line", "balance": "neutral" },
@@ -150,6 +157,7 @@
     "looks_like": "knife_butcher",
     "weight": "350 g",
     "volume": "300 ml",
+    "longest_side": "30 cm",
     "price": 3500,
     "price_postapoc": 50,
     "to_hit": { "grip": "weapon", "length": "short", "surface": "line", "balance": "uneven" },