diff --git a/macrovision.js b/macrovision.js
index c85e3422..f6eb7a7f 100644
--- a/macrovision.js
+++ b/macrovision.js
@@ -323,7 +323,8 @@ const config = {
     autoFit: false,
     drawYAxis: true,
     drawXAxis: false,
-    autoFoodIntake: false
+    autoFoodIntake: false,
+    autoPreyCapacity: false
 }
 
 const availableEntities = {
@@ -810,6 +811,15 @@ function makeEntity(info, views, sizes) {
                     }
                 }
 
+                if (config.autoPreyCapacity && view.attributes.weight !== undefined && view.attributes.capacity === undefined) {
+                    view.attributes.capacity = {
+                        name: "Capacity",
+                        power: 3,
+                        type: "volume",
+                        base: math.unit(0.2 * view.attributes.weight.base.toNumber("lbs") / 150, "people")
+                    }
+                }
+
                 Object.entries(view.attributes).forEach(([key, val]) => {
                     Object.defineProperty(
                         view,
@@ -2033,7 +2043,7 @@ const settingsData = {
     },
     "auto-food-intake": {
         name: "Estimate Food Intake",
-        desc: "Guess how much food creatures need, based on their mass",
+        desc: "Guess how much food creatures need, based on their mass -- 2000kcal per 150lbs",
         type: "toggle",
         default: false,
         get value() {
@@ -2042,6 +2052,18 @@ const settingsData = {
         set value(param) {
             config.autoFoodIntake = param
         }
+    },
+    "auto-prey-capacity": {
+        name: "Estimate Prey Capacity",
+        desc: "Guess how many people a creature could eat, based on its mass -- 1 person per 750lbs",
+        type: "toggle",
+        default: false,
+        get value() {
+            return config.autoPreyCapacity
+        },
+        set value(param) {
+            config.autoPreyCapacity = param
+        }
     }
 }