When doing electrical wiring through conduit, there are plenty of tables that tell you that you can run up to 16 lines of 10 Gauge THHN wire through a 1" EMT conduit but you are stuck doing some calculations if you want to run mixed sizes and still be on the right side of the 2014 National Electric Code.
Just ran into the Conduit Fill Calculator - easy peasy. Plug in the size and type of conduit, the gauge and type of wire and hit the Calculate button.
Their parent site also has a mobile app (Android, iOs and Web) for this and much much more.
$15 with free upgrades for life. If I was doing more wiring, I would get it in a heartbeat.