Wiring – What size metric wire is required for 240 VAC 30 Amps located in house with run of 90M or <100 feet to a garage

You should really have done this calculation before installing the conduit but a 1" will be sufficient for what you want to do.

The answer is: the sub-panel needs to be sized large enough to carry the calculated load of all of the appliances, lights, fans, and plug connected loads. If you have all 120 volt loads you can either add up all the currents and then divide by 2 since you are splitting the load between two conductors on a 240 volt panel, or add up all the wattages and divide by 240 to get the max current on the feeders to the sub-panel.

Most of what you listed are very small loads except for the crock pots and other possible plug connected loads that can be manufactured as high as 1500 watts for 120 volts. (I am thinking of a resistive charcoal starter.) So, I would calculate the receptacles at a minimum of 1000 watts per if you plan to have mixed loads at that location.

All that said there are only a few basic sizes for sub-panels and a back-of-the-envelope calculation tells me you could have as small as a 60 amp panel here with #6 wire feeding it. Now, if you want some room (ampacity) to add on in the future and have big plans to grow your outdoor kitchen, you may want to go with a 100 amp panel fed with #3.

Now it comes down to personal preference.

Good luck and happy grilling.

This may not be worth the extra expense and work of installing a sub panel. Looking up some prices from the blue hardware store:

6/3 roll 50 ft       $102        12/2 roll 250 ft   $48
subpanel              $60        3 breakers         $20
3 subpanel breakers   $20        boxes and outlets  $25
main panel breaker    $20
12/2 roll 50 ft       $25
boxes and outlets     $25
-------------------------        ----------------------
total                $255        total              $93

I think 3 circuits is appropriate. One for the tool you're actively running, one for dust collection, and a spare if you need to be running two tools at once.

Edit: If you plan on upgrading to tools that will draw more than 20 amps, it may be worth the extra expense of putting in a subpanel. That way you can use shorter runs of 10/2 or 10/3 from the subpanel to the tools, instead of running all the way back to the main panel.