diff --git a/src/HCat/Internal.hs b/src/HCat/Internal.hs
index d28a0ff..467a446 100644
--- a/src/HCat/Internal.hs
+++ b/src/HCat/Internal.hs
@@ -4,6 +4,8 @@ module HCat.Internal where
 import Data.Text (Text)
 import Data.Text qualified as T
 
+import System.Process qualified as P
+
 -- | @parseArgs@ takes a list of strings and returns a single FilePath if there was exactly one element.
 --
 -- >>> parseArgs ["foo"]
@@ -67,3 +69,8 @@ paginate (ScreenDimensions rows cols) =
 
 type Pages = [Page]
 type Page = Text
+
+getScreenDimensions :: IO ScreenDimensions
+getScreenDimensions = ScreenDimensions <$> tput "lines" <*> tput "cols"
+ where
+  tput cmd = read <$> P.readProcess "tput" [cmd] ""