diff --git a/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs b/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
index e1ff87f..b042a5e 100644
--- a/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
+++ b/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
@@ -27,6 +27,7 @@
             ce.RegisterFunction("COS", 1, Cos);
             ce.RegisterFunction("COSH", 1, Cosh);
             ce.RegisterFunction("COT", 1, Cot);
+            ce.RegisterFunction("CSCH", 1, Csch);
             ce.RegisterFunction("DECIMAL", 2, MathTrig.Decimal);
             ce.RegisterFunction("DEGREES", 1, Degrees);
             ce.RegisterFunction("EVEN", 1, Even);
@@ -128,6 +129,14 @@
             return 1 / tan;
         }
 
+        private static object Csch(List<Expression> p)
+        {
+            if (Math.Abs((double)p[0].Evaluate()) < Double.Epsilon)
+                throw new DivisionByZeroException();
+
+            return 1 / Math.Sinh(p[0]);
+        }
+
         private static object Decimal(List<Expression> p)
         {
             string source = p[0];
diff --git a/ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs b/ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs
index d9bead9..be8bb17 100644
--- a/ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs
+++ b/ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs
@@ -195,5 +195,27 @@
                 Assert.Throws<NoValueAvailableException>(() => ws.Evaluate("SUMPRODUCT(A1:A10, B1:B5)"));
             }
         }
+
+        [TestCase(1, 0.850918128)]
+        [TestCase(2, 0.275720565)]
+        [TestCase(3, 0.09982157)]
+        [TestCase(4, 0.03664357)]
+        [TestCase(5, 0.013476506)]
+        [TestCase(6, 0.004957535)]
+        [TestCase(7, 0.001823765)]
+        [TestCase(8, 0.000670925)]
+        [TestCase(9, 0.00024682)]
+        [TestCase(10, 0.000090799859712122200000)]
+        [TestCase(11, 0.0000334034)]
+        public void CSch_CalculatesCorrectValues(double input, double expectedOutput)
+        {
+            Assert.AreEqual(expectedOutput, (double)XLWorkbook.EvaluateExpr($@"CSCH({input})"), 0.000000001);
+        }
+
+        [Test]
+        public void Csch_ReturnsDivisionByZeroErrorOnInput0()
+        {
+            Assert.Throws<DivisionByZeroException>(() => XLWorkbook.EvaluateExpr("CSCH(0)"));
+        }
     }
 }