diff --git a/backend/src/protocol.rs b/backend/src/protocol.rs
index decf70b..79e3964 100644
--- a/backend/src/protocol.rs
+++ b/backend/src/protocol.rs
@@ -4,6 +4,7 @@ use std::fmt;
 pub const TICK_RATE_HZ: u16 = 120;
 pub const SAMPLE_RATE_HZ: u16 = 40;
 pub const PHYSICS_DT: f32 = 1.0 / TICK_RATE_HZ as f32;
+pub const FEET_TO_METERS: f32 = 0.3048;
 
 pub const STONES_PER_TEAM: u8 = 8;
 pub const ENDS: u8 = 10;
@@ -12,7 +13,7 @@ pub const ENDS: u8 = 10;
 pub const SHEET_WIDTH: f32 = 5.0;
 pub const SHEET_LENGTH: f32 = 45.0;
 pub const HOUSE_CENTER: (f32, f32) = (0.0, 38.5);
-pub const HOUSE_RADIUS: f32 = 1.83; // 12 ft
+pub const HOUSE_RADIUS: f32 = 6.0 * FEET_TO_METERS; // 12 ft diameter → 6 ft radius
 pub const HOG_LINE_Y: f32 = 21.0;
 pub const BACK_LINE_Y: f32 = 42.0;
 pub const HACK_Y: f32 = 2.0;
diff --git a/frontend/src/protocol.ts b/frontend/src/protocol.ts
index 7e74f8c..2c9ba22 100644
--- a/frontend/src/protocol.ts
+++ b/frontend/src/protocol.ts
@@ -4,12 +4,13 @@ export const STONES_PER_TEAM = 8
 export const ENDS = 10
 export const SHEET_WIDTH = 5.0
 export const SHEET_LENGTH = 45.0
+export const FEET_TO_METERS = 0.3048
 export const HOUSE_CENTER = { x: 0, y: 38.5 }
-export const HOUSE_RADIUS = 1.83
-export const BUTTON_RADIUS = 0.1524
-export const FOUR_FT_RADIUS = 0.6096
-export const EIGHT_FT_RADIUS = 1.2192
-export const TWELVE_FT_RADIUS = 1.8288
+export const HOUSE_RADIUS = 6 * FEET_TO_METERS
+export const BUTTON_RADIUS = 0.5 * FEET_TO_METERS
+export const FOUR_FT_RADIUS = 2 * FEET_TO_METERS
+export const EIGHT_FT_RADIUS = 4 * FEET_TO_METERS
+export const TWELVE_FT_RADIUS = 6 * FEET_TO_METERS
 export const HOG_LINE_Y = 21.0
 export const BACK_LINE_Y = 42.0
 export const HACK_Y = 2.0