DIY Parking Pad 25x10

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So my questions would be
1) how far down (inches) to dig?
2) Geogrid a good idea?
3) how many tons of gravel and what size?

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1) past the grass & black dirt till you hit clay
2) yes
3) 25x10xdepth/27+5% waste = cy of aggregate

I have a similar sized project I’ve had on the back burner. Would this be cheaper than a concrete slab?

Before going to far with this project, you need to know how solid your soil is. Is there a clay base just under the grass. If not, the soil will not support the rocks very well and in a few years you will probably need to add more rocks.

If this is the case, you need to consider the cost of using rocks vs. concrete. If concrete, do you pour a 10x25 foot pad or two "strips", say 2 foot wide by 25 feet.

Two "strips" could be done with about 35 sacks [1cubic foot bags] of concrete and renting a concrete mixer. Do one "strip" and see if you have enough bags to finish the other strip. You don't what to run out of bags while doing the second pour.

For a 10x25 foot pad, hire someone, that is a lot of work unless you have a lot of experience with concrete. You could save some money and put in the boards around the boarder after doing the dirt work preparation with the footings.

If you pour concrete on top of the grass, be sure to slope the front edge so the tires can easily roll up on the concrete.

I second the road base. A buddy did a road base drive way and it compacted and was hard as concrete in a year. Once it's settled and compacted you can top dress with gravel or whatever else you want. He had concrete poured where the drive was recently and he couldn't break it with a shovel and the tractor had a hard enough time breaking into it as well.