The excavation calculators include various calculators that should help in estimating some items involved. With excavating it is pretty hard to come up with a price for cost of excavation.
The time it takes to excavate a hole for a basement will have a lot to do with the skills of the operator.
Excavating for foundations, one excavator operator was be able to do it in 4 hours. The excavation was just about perfect for placing the footings with a level excavation floor.
A second operator, working in this same sub division, would take all day+ and placing the footings for the home after he was finished took a lot of additional work.
Both operators used identical sized machines!