diff --git a/labygui.py b/labygui.py
index bda96c5..91fb1d7 100644
--- a/labygui.py
+++ b/labygui.py
@@ -135,7 +135,15 @@ def fix_angle(a):
   return a * 2 * asin(1) / pi
 
 def cout(x):
-  return len(str(round(abs(x)/1.,5)))
+  n, c = 5, 1
+  x = round(abs(x) * 10**n)
+  if x:
+    c = max(n + 1 - len(str(x)), 0)
+    while n and not (x % 10):
+      x = x // 10
+      n -= 1
+    c += not n
+  return 1 + len(str(x)) + c
 
 def tourner(a):
   global state