diff --git a/src/Calculator.ts b/src/Calculator.ts
index 8795d57..0395f49 100644
--- a/src/Calculator.ts
+++ b/src/Calculator.ts
@@ -86,4 +86,9 @@ export default class Calculator {
     this.current = Math.cosh(this.current);
     return this;
   }
+
+  public tanh() {
+    this.current = Math.tanh(this.current);
+    return this;
+  }
 }