diff --git a/engine/src/search.rs b/engine/src/search.rs
index 51dbf2f..99465fb 100644
--- a/engine/src/search.rs
+++ b/engine/src/search.rs
@@ -284,6 +284,7 @@ impl<'a, Log: LogLevel> Search<'a, Log> {
         score: Score,
         nps: f32,
         time: u64,
+        hashfull: u16,
         pv: &PrincipleVariation,
     ) {
         // create UciInfo and print it
@@ -294,6 +295,7 @@ impl<'a, Log: LogLevel> Search<'a, Log> {
             .score(score)
             .nps(nps.trunc())
             .time(time)
+            .hashfull(hashfull)
             .pv(pv.iter().map(|m| m.to_long_algebraic()));
         let message = UciResponse::info(info);
         let _unused = writeln!(self.output, "{message}");
@@ -406,6 +408,7 @@ impl<'a, Log: LogLevel> Search<'a, Log> {
                     (self.nodes as f32 / self.parameters.start_time.elapsed().as_secs_f32())
                         .trunc(),
                     self.parameters.start_time.elapsed().as_millis() as u64,
+                    self.transposition_table.hashfull(),
                     &best_result.pv,
                 );
             }
@@ -427,6 +430,7 @@ impl<'a, Log: LogLevel> Search<'a, Log> {
                 best_result.score,
                 (self.nodes as f32 / self.parameters.start_time.elapsed().as_secs_f32()).trunc(),
                 self.parameters.start_time.elapsed().as_millis() as u64,
+                self.transposition_table.hashfull(),
                 &best_result.pv,
             );
         }
diff --git a/engine/src/ttable.rs b/engine/src/ttable.rs
index 5aefca3..59fa71a 100644
--- a/engine/src/ttable.rs
+++ b/engine/src/ttable.rs
@@ -125,6 +125,12 @@ impl TranspositionTable {
             * 100_f64
     }
 
+    pub(crate) fn hashfull(&self) -> u16 {
+        let sample = self.table.len().min(1000);
+        let used = self.table[..sample].iter().filter(|e| e.is_some()).count();
+        ((used * 1000) / sample) as u16
+    }
+
     pub(crate) fn size(&self) -> usize {
         self.table.len()
     }