A calculator is only available on the LockDown Browser toolbar if your instructor has enabled this function. If it's available, you'll see the icon as shown below.
![Calculator Icon Calculator Icon](http://dyzz9obi78pm5.cloudfront.net/app/image/id/5666155832131c8f668c3f36/n/calculator.jpg)
For the calculator to appear, LockDown Browser needs to be able to connect to our server at "smc-service-cloud.respondus2.com". If the computer and/or network is blocking access to that server, the calculator icon will not appear in the LockDown Browser toolbar.