diff --git a/EditSet.tsx b/EditSet.tsx
index 9c715e4..222ec12 100644
--- a/EditSet.tsx
+++ b/EditSet.tsx
@@ -30,6 +30,7 @@ import StackHeader from "./StackHeader";
 import { toast } from "./toast";
 import Select from "./Select";
 import { PERMISSIONS, RESULTS, check, request } from "react-native-permissions";
+import { convert } from "./conversions";
 
 export default function EditSet() {
   const { params } = useRoute<RouteProp<StackParams, "EditSet">>();
@@ -97,12 +98,19 @@ export default function EditSet() {
   const handleSubmit = async () => {
     if (!name) return;
 
+    let newWeight = Number(weight);
+    let newUnit = unit;
+    if (settings.autoConvert && unit !== settings.autoConvert) {
+      newUnit = settings.autoConvert;
+      newWeight = convert(newWeight, unit, settings.autoConvert);
+    }
+
     const newSet: Partial<GymSet> = {
       id: set.id,
       name,
       reps: Number(reps || 0),
-      weight: Number(weight || 0),
-      unit,
+      weight: newWeight,
+      unit: newUnit,
       minutes: Number(set.minutes ?? 3),
       seconds: Number(set.seconds ?? 30),
       sets: set.sets ?? 3,
diff --git a/SettingsPage.tsx b/SettingsPage.tsx
index abede86..1be837a 100644
--- a/SettingsPage.tsx
+++ b/SettingsPage.tsx
@@ -214,6 +214,27 @@ export default function SettingsPage() {
         />
       ),
     },
+    {
+      name: "Auto convert",
+      renderItem: (name: string) => (
+        <Select
+          label={name}
+          items={[
+            { label: "Off", value: "" },
+            { label: "Kilograms", value: "kg" },
+            { label: "Pounds", value: "lb" },
+            { label: "Stone", value: "stone" },
+          ]}
+          value={settings.autoConvert}
+          onChange={async (value) => {
+            setValue("autoConvert", value);
+            await update("autoConvert", value);
+            if (value) toast(`Sets now automatically convert to ${value}`);
+            else toast("Stopped automatically converting sets.");
+          }}
+        />
+      ),
+    },
     {
       name: "Vibration duration (ms)",
       renderItem: (name: string) => (
diff --git a/StartPlan.tsx b/StartPlan.tsx
index deae5f0..1f7068f 100644
--- a/StartPlan.tsx
+++ b/StartPlan.tsx
@@ -28,6 +28,7 @@ import StartPlanItem from "./StartPlanItem";
 import { toast } from "./toast";
 import { PERMISSIONS, RESULTS, check, request } from "react-native-permissions";
 import Select from "./Select";
+import { convert } from "./conversions";
 
 export default function StartPlan() {
   const { params } = useRoute<RouteProp<StackParams, "StartPlan">>();
@@ -101,11 +102,19 @@ export default function StartPlan() {
     const exercise = counts[selected];
     const best = await getBestSet(exercise.name);
     delete best.id;
+
+    let newWeight = Number(weight);
+    let newUnit = unit;
+    if (settings.autoConvert && unit !== settings.autoConvert) {
+      newUnit = settings.autoConvert;
+      newWeight = convert(newWeight, unit, settings.autoConvert);
+    }
+
     const newSet: GymSet = {
       ...best,
-      weight: +weight,
-      reps: +reps,
-      unit,
+      weight: newWeight,
+      reps: Number(reps),
+      unit: newUnit,
       created: now,
       hidden: false,
     };
@@ -113,7 +122,8 @@ export default function StartPlan() {
     await refresh();
     if (
       settings.notify &&
-      (+weight > best.weight || (+reps > best.reps && +weight === best.weight))
+      (+weight > best.weight ||
+        (Number(reps) > best.reps && +weight === best.weight))
     ) {
       toast("Great work King! That's a new record.");
     }
diff --git a/android/app/build.gradle b/android/app/build.gradle
index 52fe808..6898a0c 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -85,8 +85,8 @@ android {
         applicationId "com.massive"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 36211
-        versionName "1.185"
+        versionCode 36212
+        versionName "1.186"
     }
     signingConfigs {
         release {
diff --git a/conversions.ts b/conversions.ts
new file mode 100644
index 0000000..5683e60
--- /dev/null
+++ b/conversions.ts
@@ -0,0 +1,11 @@
+export function convert(weight: number, fromUnit: string, toUnit: string) {
+  let result = Number(weight);
+  if (fromUnit === "lb" && toUnit === "kg") result /= 2.2;
+  else if (fromUnit === "kg" && toUnit === "lb") result *= 2.2;
+  else if (fromUnit === "stone" && toUnit === "kg") result *= 6.35;
+  else if (fromUnit === "kg" && toUnit === "stone") result /= 6.35;
+  else if (fromUnit === "stone" && toUnit === "lb") result *= 14;
+  else if (fromUnit === "lb" && toUnit === "stone") result /= 14;
+  result = Math.round((result + Number.EPSILON) * 100) / 100;
+  return result;
+}
diff --git a/data-source.ts b/data-source.ts
index 70ce84b..2f57630 100644
--- a/data-source.ts
+++ b/data-source.ts
@@ -36,6 +36,7 @@ import Weight from "./weight";
 import { settingsStartup1699783784680 } from "./migrations/1699783784680-settings-startup";
 import { settingsBackupDir1699839054226 } from "./migrations/1699839054226-settings-backup-dir";
 import { homeHistoryStartup1699853245534 } from "./migrations/1699853245534-home-history-startup";
+import { autoConvert1699948105001 } from "./migrations/1699948105001-auto-convert";
 
 export const AppDataSource = new DataSource({
   type: "react-native",
@@ -78,5 +79,6 @@ export const AppDataSource = new DataSource({
     settingsStartup1699783784680,
     settingsBackupDir1699839054226,
     homeHistoryStartup1699853245534,
+    autoConvert1699948105001,
   ],
 });
diff --git a/migrations/1699948105001-auto-convert.ts b/migrations/1699948105001-auto-convert.ts
new file mode 100644
index 0000000..61209a9
--- /dev/null
+++ b/migrations/1699948105001-auto-convert.ts
@@ -0,0 +1,9 @@
+import { MigrationInterface, QueryRunner } from "typeorm";
+
+export class autoConvert1699948105001 implements MigrationInterface {
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query("ALTER TABLE settings ADD COLUMN autoConvert TEXT");
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {}
+}
diff --git a/package.json b/package.json
index cd651f8..7754940 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "massive",
-  "version": "1.185",
+  "version": "1.186",
   "private": true,
   "license": "GPL-3.0-only",
   "scripts": {
diff --git a/settings.ts b/settings.ts
index 30f3435..160e143 100644
--- a/settings.ts
+++ b/settings.ts
@@ -52,4 +52,7 @@ export default class Settings {
 
   @Column("text")
   startup: string | null;
+
+  @Column("text")
+  autoConvert: string | null;
 }