I just made an iPhone/iPad app to estimate the cost of earthworks based on your excavator and truck stats. I use it to replace our excel spreadsheets and do quick estimates. Here is the app store link
Earthworks Calculator . You put in:
[ul]
[li]Haul Distance[/li]
[li]Average Speed: The average speed of the trucks along the route between sites.[/li]
[li]Truck Volume[/li]
[li]Dump Time: Extra time required by truck to manoeuvre at fill / spoil site. Can be zero.[/li]
[li]bucket volume[/li]
[li]bucket cycle time[/li]
[li] hourly cost of excavator, truck, labour*, dozer*, water cart*, roller*, grader* * = not required[/li]
[li] if it's spoil and not fill you can put in the disposal fee[/li]
[/ul]
It calculates:
[ul]
[li]production rate for your excavator [/li]
[li] number of trucks you need[/li]
[li] cost per cubic yard or cubic meter [/li]
[li] adjust the number of trucks and see how that changes your production rates and costs change.[/li]
[/ul]
I'll put out a calculator for scrapers in the future.