diff --git a/src/hud.rs b/src/hud.rs
index f7f9c29..341d281 100644
--- a/src/hud.rs
+++ b/src/hud.rs
@@ -656,13 +656,13 @@ fn update_speedometer(
         let speedometer_split = 5_000.0;
         if let Ok(mut speedometer) = q_speedometer.get_single_mut() {
             let custom_c = speedometer_split;
-            let fraction = nature::lorenz_factor_custom_c((custom_c - speed).clamp(0.0, custom_c), custom_c).clamp(0.0, 1.0) as f32;
+            let fraction = nature::inverse_lorentz_factor_custom_c((custom_c - speed).clamp(0.0, custom_c), custom_c).clamp(0.0, 1.0) as f32;
             let wid = (fraction * SPEEDOMETER_WIDTH).clamp(0.0, 100.0);
             speedometer.width = Val::Vw(wid);
         }
         if let Ok(mut speedometer2) = q_speedometer2.get_single_mut() {
             let custom_c = nature::C - speedometer_split;
-            let fraction = nature::lorenz_factor_custom_c((custom_c - speed + speedometer_split).clamp(0.0, custom_c), custom_c).clamp(0.0, 1.0) as f32;
+            let fraction = nature::inverse_lorentz_factor_custom_c((custom_c - speed + speedometer_split).clamp(0.0, custom_c), custom_c).clamp(0.0, 1.0) as f32;
             let wid = (fraction * SPEEDOMETER_WIDTH).clamp(0.0, 100.0);
             speedometer2.width = Val::Vw(wid);
         }
diff --git a/src/nature.rs b/src/nature.rs
index 558879f..576cf0a 100644
--- a/src/nature.rs
+++ b/src/nature.rs
@@ -138,12 +138,20 @@ pub fn readable_speed(speed: f64) -> String {
     }
 }
 
-pub fn lorenz_factor(speed: f64) -> f64 {
-    (1.0 - (speed.powf(2.0) / C.powf(2.0))).sqrt()
+pub fn lorentz_factor(speed: f64) -> f64 {
+    (1.0 - (speed.powf(2.0) / C.powf(2.0))).powf(-0.5)
 }
 
-pub fn lorenz_factor_custom_c(speed: f64, c: f64) -> f64 {
-    (1.0 - (speed.powf(2.0) / c.powf(2.0))).sqrt()
+pub fn lorentz_factor_custom_c(speed: f64, c: f64) -> f64 {
+    (1.0 - (speed.powf(2.0) / c.powf(2.0))).powf(-0.5)
+}
+
+pub fn inverse_lorentz_factor(speed: f64) -> f64 {
+    (1.0 - (speed.powf(2.0) / C.powf(2.0))).powf(0.5)
+}
+
+pub fn inverse_lorentz_factor_custom_c(speed: f64, c: f64) -> f64 {
+    (1.0 - (speed.powf(2.0) / c.powf(2.0))).powf(0.5)
 }
 
 pub fn simple_orbital_period(mass: f64, distance: f64) -> f64 {