I came across an app that might be of use to others.
You select your camera then put in your focal length. That gives you the hyperfocal distance for the .
When you want to get the you enter the f/# you will use and the focusing distance.
As an example, I entered 600D with 200mm . That gave hyperfocal distance as 397.03 metres
With focus distance of 10metres it told me was 9.76 to 10.25 metres
Then with changing the to 55mm
Hyperfocal 30.06 metres
With focus distance of 10metres it told me was 7.51 to 14.96 metres
If anyone knows how to figure out if this is accurate please do!
The phone app was free and I am not involved in its creation