diff --git a/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs b/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
index 2d1368d..8111c18 100644
--- a/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
+++ b/ClosedXML/Excel/CalcEngine/Functions/MathTrig.cs
@@ -25,6 +25,7 @@
             ce.RegisterFunction("COMBIN", 2, Combin);
             ce.RegisterFunction("COS", 1, Cos);
             ce.RegisterFunction("COSH", 1, Cosh);
+            ce.RegisterFunction("CSCH", 1, Csch);
             ce.RegisterFunction("DEGREES", 1, Degrees);
             ce.RegisterFunction("EVEN", 1, Even);
             ce.RegisterFunction("EXP", 1, Exp);
@@ -115,6 +116,15 @@
             return Math.Cosh(p[0]);
         }
 
+        private static object Csch(List<Expression> p)
+        {
+            if (p[0].Evaluate().Equals(0))
+            {
+                return ErrorExpression.ExpressionErrorType.DivisionByZero;
+            }
+            return 1 / Math.Sinh(p[0]);
+        }
+
         private static object Exp(List<Expression> p)
         {
             return Math.Exp(p[0]);
diff --git a/ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs b/ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs
index b9003d2..e66c0e2 100644
--- a/ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs
+++ b/ClosedXML_Tests/Excel/CalcEngine/MathTrigTests.cs
@@ -1,4 +1,5 @@
 using ClosedXML.Excel;
+using ClosedXML.Excel.CalcEngine;
 using ClosedXML.Excel.CalcEngine.Exceptions;
 using NUnit.Framework;
 using System;
@@ -139,5 +140,37 @@
                 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)
+        {
+            using (var wb = new XLWorkbook())
+            {
+                var ws = wb.AddWorksheet("Sheet1");
+                ws.FirstCell().Value = input;
+                Assert.AreEqual(expectedOutput, (double)ws.Evaluate("CSCH(A1)"), 0.000000001);
+            }
+        }
+
+        [Test]
+        public void Csh_ThrowsOnInput0()
+        {
+            using (var wb = new XLWorkbook())
+            {
+                var ws = wb.AddWorksheet("Sheet1");
+                ws.FirstCell().Value = 0;
+                Assert.AreEqual(ErrorExpression.ExpressionErrorType.DivisionByZero, ws.Evaluate("CSH(A1)"));
+            }
+        }
     }
 }