Earthwork Production Unit Cost
Joins the equipment hourly rate to the hourly production into the unit cost a bid needs.
Example
You enter
- Equipment ownership + operating rate ($/hr) 150
- Operator wage + burden ($/hr) 65
- Production rate (cy/hr) 656
You get
- Hourly cost 215
- Unit cost 0.3277
Details, formula, and sources
Unit cost ($/cy) = (equipment + operator + support $/hr) / production (cy/hr). A dozer at $215/hr all-in moving 656 cy/hr costs $0.33/cy, but let production fall to 400 cy/hr on soft ground and it costs $0.54/cy - a 63% jump the rate alone never shows. Low production, not the rate, is what blows up the unit price.
hourly_cost = equipment_rate_per_hr + operator_rate_per_hr + support_rate_per_hr; unit_cost_per_cy = hourly_cost / production_cy_per_hr; total_cost = unit_cost_per_cy x total_cy.
Production unit-cost identity by name (unit cost = hourly cost / production); first-principles cost arithmetic.
The unit-cost arithmetic is public first-principles; the hourly rates come from the cost records and the production from the production tiles.
Estimate. AHJ and licensed professional govern.
Field names used by the API: equipment_rate_per_hr, operator_rate_per_hr, production_cy_per_hr, hourly_cost, unit_cost_per_cy
- Hourly rates equipment ownership + operating, operator wage + burden, and support, from the cost recordsequipment-hourly-rate / cost records
- Production the hourly production rate from the production tiles (dozer, haul-cycle, loader)production tiles