diff --git a/komorebi-core/src/custom_layout.rs b/komorebi-core/src/custom_layout.rs
index 0c7eeee4b..26b5991da 100644
--- a/komorebi-core/src/custom_layout.rs
+++ b/komorebi-core/src/custom_layout.rs
@@ -72,7 +72,7 @@ impl CustomLayout {
     }
 
     #[must_use]
-    pub fn primary_width_percentage(&self) -> Option<usize> {
+    pub fn primary_width_percentage(&self) -> Option<f32> {
         for column in self.iter() {
             if let Column::Primary(Option::Some(ColumnWidth::WidthPercentage(percentage))) = column
             {
@@ -83,7 +83,7 @@ impl CustomLayout {
         None
     }
 
-    pub fn set_primary_width_percentage(&mut self, percentage: usize) {
+    pub fn set_primary_width_percentage(&mut self, percentage: f32) {
         for column in self.iter_mut() {
             if let Column::Primary(Option::Some(ColumnWidth::WidthPercentage(current))) = column {
                 *current = percentage;
@@ -262,7 +262,7 @@ pub enum Column {
 
 #[derive(Clone, Copy, Debug, Serialize, Deserialize, JsonSchema)]
 pub enum ColumnWidth {
-    WidthPercentage(usize),
+    WidthPercentage(f32),
 }
 
 #[derive(Clone, Copy, Debug, Serialize, Deserialize, JsonSchema)]
diff --git a/komorebi/src/process_command.rs b/komorebi/src/process_command.rs
index 1a30547b4..4b59335a4 100644
--- a/komorebi/src/process_command.rs
+++ b/komorebi/src/process_command.rs
@@ -683,15 +683,15 @@ impl WindowManager {
                     if matches!(axis, Axis::Horizontal) {
                         let percentage = custom
                             .primary_width_percentage()
-                            .unwrap_or(100 / custom.len());
+                            .unwrap_or(100.0 / (custom.len() as f32));
 
                         if no_layout_rules {
                             match sizing {
                                 Sizing::Increase => {
-                                    custom.set_primary_width_percentage(percentage + 5);
+                                    custom.set_primary_width_percentage(percentage + 5.0);
                                 }
                                 Sizing::Decrease => {
-                                    custom.set_primary_width_percentage(percentage - 5);
+                                    custom.set_primary_width_percentage(percentage - 5.0);
                                 }
                             }
                         } else {
@@ -700,10 +700,10 @@ impl WindowManager {
                                     if let Layout::Custom(ref mut custom) = rule.1 {
                                         match sizing {
                                             Sizing::Increase => {
-                                                custom.set_primary_width_percentage(percentage + 5);
+                                                custom.set_primary_width_percentage(percentage + 5.0);
                                             }
                                             Sizing::Decrease => {
-                                                custom.set_primary_width_percentage(percentage - 5);
+                                                custom.set_primary_width_percentage(percentage - 5.0);
                                             }
                                         }
                                     }