diff --git a/BKRCalculator.sln b/BKRCalculator.sln
index ce2b1ea..c266785 100644
--- a/BKRCalculator.sln
+++ b/BKRCalculator.sln
@@ -7,6 +7,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BKRCalculator", "BKRCalcula
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BKRCalculatorTest", "BKRCalculatorTest\BKRCalculatorTest.csproj", "{1C9D03F8-2CFD-4AF9-812A-9EBD7C497F76}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BKRCalculatorApi", "BKRCalculatorApi\BKRCalculatorApi.csproj", "{4F0B5B4E-E8C6-4B40-9AA2-E38C46747947}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -24,5 +26,9 @@ Global
 		{1C9D03F8-2CFD-4AF9-812A-9EBD7C497F76}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{1C9D03F8-2CFD-4AF9-812A-9EBD7C497F76}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{1C9D03F8-2CFD-4AF9-812A-9EBD7C497F76}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4F0B5B4E-E8C6-4B40-9AA2-E38C46747947}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4F0B5B4E-E8C6-4B40-9AA2-E38C46747947}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4F0B5B4E-E8C6-4B40-9AA2-E38C46747947}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4F0B5B4E-E8C6-4B40-9AA2-E38C46747947}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal
diff --git a/BKRCalculatorApi/BKRCalculatorApi.csproj b/BKRCalculatorApi/BKRCalculatorApi.csproj
new file mode 100644
index 0000000..0d83392
--- /dev/null
+++ b/BKRCalculatorApi/BKRCalculatorApi.csproj
@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="7.0.0" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\BKRCalculator\BKRCalculator.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/BKRCalculatorApi/Controllers/GroupAnalysisController.cs b/BKRCalculatorApi/Controllers/GroupAnalysisController.cs
new file mode 100644
index 0000000..434ebb5
--- /dev/null
+++ b/BKRCalculatorApi/Controllers/GroupAnalysisController.cs
@@ -0,0 +1,32 @@
+using KDVManager.BKRCalculator;
+using Microsoft.AspNetCore.Mvc;
+
+namespace BKRCalculatorApi.Controllers;
+
+[ApiController]
+[Route("[controller]")]
+public class GroupAnalysisController : ControllerBase
+{
+    private readonly ILogger<GroupAnalysisController> _logger;
+
+    public GroupAnalysisController(ILogger<GroupAnalysisController> logger)
+    {
+        _logger = logger;
+    }
+
+    [HttpPost(Name = "CalculateBKR")]
+    public ActionResult<GroupAnalysisResult> CalculateBKR([FromBody] AgeGroupCounts counts)
+    {
+        GroupAnalyzer groupAnalyzer = new GroupAnalyzer();
+
+        try
+        {
+            var result = groupAnalyzer.CalculateBKR(counts);
+            return Ok(result);
+        }
+        catch (Exception ex)
+        {
+            return BadRequest(new { message = ex.Message });
+        }
+    }
+}
diff --git a/BKRCalculatorApi/Program.cs b/BKRCalculatorApi/Program.cs
new file mode 100644
index 0000000..919f5f7
--- /dev/null
+++ b/BKRCalculatorApi/Program.cs
@@ -0,0 +1,21 @@
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+
+builder.Services.AddControllers();
+// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.UseSwagger();
+    app.UseSwaggerUI();
+}
+
+app.MapControllers();
+
+app.Run();
diff --git a/BKRCalculatorApi/Properties/launchSettings.json b/BKRCalculatorApi/Properties/launchSettings.json
new file mode 100644
index 0000000..150a147
--- /dev/null
+++ b/BKRCalculatorApi/Properties/launchSettings.json
@@ -0,0 +1,41 @@
+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:63372",
+      "sslPort": 44306
+    }
+  },
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "http://localhost:5083",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7257;http://localhost:5083",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}
diff --git a/BKRCalculatorApi/appsettings.Development.json b/BKRCalculatorApi/appsettings.Development.json
new file mode 100644
index 0000000..ff66ba6
--- /dev/null
+++ b/BKRCalculatorApi/appsettings.Development.json
@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}
diff --git a/BKRCalculatorApi/appsettings.json b/BKRCalculatorApi/appsettings.json
new file mode 100644
index 0000000..4d56694
--- /dev/null
+++ b/BKRCalculatorApi/appsettings.json
@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}