diff --git a/src/alarm.rs b/src/alarm.rs
index 87ad731..0f1b8ea 100644
--- a/src/alarm.rs
+++ b/src/alarm.rs
@@ -280,8 +280,8 @@ impl AlarmRoster {
 
     // Reset every alarm.
     pub fn reset_all(&mut self) {
-        for a in &mut self.list {
-            a.reset();
+        for alarm in &mut self.list {
+            alarm.reset();
         }
     }
 }
diff --git a/src/clock.rs b/src/clock.rs
index 181a884..4940dc3 100644
--- a/src/clock.rs
+++ b/src/clock.rs
@@ -15,7 +15,7 @@ pub struct Clock {
     pub paused: bool,
     paused_at: Option<time::Instant>,
     pub color_index: Option<usize>,
-    font: font::Font,
+    pub font: font::Font,
 }
 
 impl Clock {
@@ -71,6 +71,16 @@ impl Clock {
         }
     }
 
+    pub fn get_width(&self) -> u16 {
+        if self.elapsed >= 3600 {
+            // Hours
+            self.font.width * 6 + 3 + 10
+        } else {
+            // Minutes and seconds only.
+            self.font.width * 4 + 2 + 5
+        }
+    }
+
     pub fn next_day(&mut self) {
         // Shift start 24h into the future.
         let next = self.start.clone() + time::Duration::from_secs(60 * 60 * 24);
diff --git a/src/clock/font.rs b/src/clock/font.rs
index 15c73e3..420874f 100644
--- a/src/clock/font.rs
+++ b/src/clock/font.rs
@@ -1,6 +1,5 @@
 
-pub const DIGIT_HEIGHT: u16 = 5;
-pub const DIGIT_WIDTH: u16 = 5;
+const DIGIT_HEIGHT: u16 = 5;
 
 pub struct Font {
     pub height: u16,
diff --git a/src/layout.rs b/src/layout.rs
index 9e2a700..1f0d9a7 100644
--- a/src/layout.rs
+++ b/src/layout.rs
@@ -1,12 +1,7 @@
 use std::sync::Arc;
 use std::sync::atomic::{AtomicBool, Ordering};
 use crate::Config;
-use crate::clock::font::*;
-
-// If screen size falls below these values we skip computation of new
-// positions.
-const MIN_WIDTH: u16 = DIGIT_WIDTH * 6 + 13;
-const MIN_HEIGHT: u16 = DIGIT_HEIGHT + 2;
+use crate::clock::Clock;
 
 pub struct Position {
     pub line: u16,
@@ -19,6 +14,9 @@ pub struct Layout {
     pub plain: bool, // Plain style clock.
     pub width: u16,
     pub height: u16,
+    clock_width: u16,
+    clock_height: u16,
+    digit_width: u16,
     pub clock_sec: Position,
     pub clock_colon0: Position,
     pub clock_min: Position,
@@ -40,6 +38,9 @@ impl Layout {
             plain: config.plain,
             width: 0,
             height: 0,
+            clock_width: 0,
+            clock_height: 0,
+            digit_width: 0,
             clock_sec: Position {col: 0, line: 0},
             clock_colon0: Position {col: 0, line: 0},
             clock_min: Position {col: 0, line: 0},
@@ -53,13 +54,16 @@ impl Layout {
         }
     }
 
-    pub fn update(&mut self, display_hours: bool, force: bool) {
+    pub fn update(&mut self, clock: &Clock, force: bool) {
         if self.force_recalc.swap(false, Ordering::Relaxed) || force {
             let (width, height) = termion::terminal_size()
                 .expect("Could not read terminal size!");
             self.width = width;
             self.height = height;
-            self.compute(display_hours);
+            self.clock_width = clock.get_width();
+            self.clock_height = clock.font.height;
+            self.digit_width = clock.font.width;
+            self.compute(clock.elapsed >= 3600);
             self.force_redraw = true;
         }
     }
@@ -67,15 +71,18 @@ impl Layout {
     #[cfg(test)]
     pub fn test_update(
         &mut self,
-        hours: bool,
+        clock: &Clock,
         width: u16,
         height: u16,
         roster_width: u16,
     ) {
         self.width = width;
         self.height = height;
+        self.clock_width = clock.get_width();
+        self.clock_height = clock.font.height;
+        self.digit_width = clock.font.width;
         self.roster_width = roster_width;
-        self.compute(hours);
+        self.compute(false);
     }
 
     pub fn can_hold(&self, other: &str) -> bool {
@@ -87,27 +94,27 @@ impl Layout {
     // terminal.
     fn compute(&mut self, display_hours: bool) {
         // Prevent integer overflow at very low screen sizes.
-        if self.width < MIN_WIDTH || self.height < MIN_HEIGHT { return; }
+        if self.width < self.clock_width || self.height < self.clock_height { return; }
 
         let middle: u16 = self.height / 2 - 1;
 
         if display_hours {
             // Seconds digits.
-            self.clock_sec.col = (self.width + self.roster_width) / 2 + DIGIT_WIDTH + 6;
+            self.clock_sec.col = (self.width + self.roster_width) / 2 + self.digit_width + 6;
             // Colon separating minutes from seconds.
-            self.clock_colon0.col = (self.width + self.roster_width) / 2 + DIGIT_WIDTH + 3;
+            self.clock_colon0.col = (self.width + self.roster_width) / 2 + self.digit_width + 3;
             // Minute digits.
-            self.clock_min.col = (self.width + self.roster_width) / 2 - DIGIT_WIDTH;
+            self.clock_min.col = (self.width + self.roster_width) / 2 - self.digit_width;
 
             // Colon separating hours from minutes.
             self.clock_colon1 = Position {
-                col: (self.width + self.roster_width) / 2 - (DIGIT_WIDTH + 3),
+                col: (self.width + self.roster_width) / 2 - (self.digit_width + 3),
                 line: middle,
             };
 
             // Hour digits.
             self.clock_hr = Position {
-                col: (self.width + self.roster_width) / 2 - (DIGIT_WIDTH * 3 + 6),
+                col: (self.width + self.roster_width) / 2 - (self.digit_width * 3 + 6),
                 line: middle,
             };
         } else {
@@ -116,7 +123,7 @@ impl Layout {
             // Colon separating minutes from seconds.
             self.clock_colon0.col = (self.width + self.roster_width) / 2;
             // Minute digits.
-            self.clock_min.col = (self.width + self.roster_width) / 2 - (DIGIT_WIDTH * 2 + 3);
+            self.clock_min.col = (self.width + self.roster_width) / 2 - (self.digit_width * 2 + 3);
         }
 
         self.clock_sec.line = middle;
@@ -125,7 +132,7 @@ impl Layout {
 
         // Days (based on position of seconds).
         self.clock_days = Position {
-            line: self.clock_sec.line + DIGIT_HEIGHT,
+            line: self.clock_sec.line + self.digit_width,
             col: self.clock_sec.col,
         };
 
diff --git a/src/lib.rs b/src/lib.rs
index 86092ce..cfb3b39 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -130,7 +130,7 @@ pub fn run(
             // Update window size information and calculate the clock position.
             // Also enforce recalculation of layout if we start displaying
             // hours.
-            layout.update(clock.elapsed >= 3600, clock.elapsed == 3600);
+            layout.update(&clock, clock.elapsed == 3600);
 
             // Check for exceeded alarms.
             if let Some((time, label)) = alarm_roster.check(&mut clock, &layout, &mut countdown) {
diff --git a/src/tests.rs b/src/tests.rs
index 8645d2e..3105d00 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -1,4 +1,5 @@
 use crate::layout::Layout;
+use crate::clock::Clock;
 use crate::Config;
 
 fn default_config() -> Config {
@@ -13,13 +14,24 @@ fn default_config() -> Config {
 #[test]
 fn layout_computation() {
     let config = default_config();
+    let mut clock = Clock::new(&config);
     let mut layout = Layout::new(&config);
 
+    // Two segment display.
     for roster_width in &[0, 10, 20, 30, 40] {
         for width in 0..256 {
             for height in 0..128 {
-                layout.test_update(height & 1 == 0, width, height, *roster_width);
+                layout.test_update(&clock, width, height, *roster_width);
             }
-        } 
+        }
+    }
+    // Three segment display.
+    clock.elapsed = 3600;
+    for roster_width in &[0, 10, 20, 30, 40] {
+        for width in 0..256 {
+            for height in 0..128 {
+                layout.test_update(&clock, width, height, *roster_width);
+            }
+        }
     }
 }