Is there a device that will calculate hours and minutes in a base 60
system?  I run the payroll for a grocery store, and it is frustrating
me to try to calculate hours worked on a standard base 10 calculator.

Hi amb4599:

Thanks for the interesting question. 

Since you compare what you want to a standard "physical" (i.e., not
online) calculator, I'm assuming that you want to have a similarly
physical device for calculating in hours and minutes.

The best device that I was able to find that is still widely available
is the "Time Master Time Calculator" from Calculated Industries.

Time Master Time Calculator 
URL: http://www.calculated.com/productcart/pc/viewPrd.asp?idproduct=55

The best place I found to buy it is at Amazon.com

Calculated Industries 9126 Time Master II
URL: http://www.amazon.com/exec/obidos/tg/detail/-/B000055WEO/002-8676966-5226469?v=glance
Price: $29.99

If you want to have a sneak peak at how it operates before purchasing
it, please look at the user manual at:

Time Master II
URL: http://www.calculated.com/UsersGuides/9126mn.pdf

I also was able to find a few online/software solutions, if that's
something that interests you:

Time Calculator
URL: http://www.wdsincorporated.com/software/timecalculator.html

Time Math Calculator
URL: http://www.csgnetwork.com/timeconv.html

Desktop Dozen Time Calculator
URL: http://www.spudcity.com/d12/D12_time_calculator.htm

Search Strategy (on Google):
* "base 60" calculator hours minutes 
* time calculator hours minutes
* "Time Calculator"
* "time master II"

I hope this helps. 

websearcher