How do you calculate equipment cost per hour?

Ask most contractors what their excavator costs an hour and you get one of three answers: a rental rate they looked up, a number their old boss used, or "it is paid off." All three are guesses, and the third is the expensive kind.

A paid-off machine is not a free machine

Every hour it runs is fuel burned, wear accumulated, a step closer to the next service interval and a step closer to the day it gets replaced. That machine has an hourly cost whether or not there is a payment attached to it.

Leaving iron out of a job cost does not make jobs cheaper. It makes every job that used a machine look more profitable than it was, which is how a busy year fails to become a good one.

The two halves

Ownership cost is what the machine costs whether it turns a wheel or not, added up for a year: depreciation (purchase price minus expected resale, spread over the years you keep it), interest or finance cost, insurance, and any property tax and storage.

Operating cost is what it costs to actually run, also for a year: fuel, which is usually the largest single line; oil, filters and scheduled service; wear parts such as tires, tracks, undercarriage, bucket teeth and cutting edges; and repairs, including the ones you have not had yet.

Operators are normally costed separately as labor rather than folded into the machine rate, so a machine that runs with different operators still costs the same. Either convention works as long as you are consistent.

The number that changes everything: utilization

Divide the yearly total by the hours the machine actually works. Not the hours in a working year. The hours on the meter.

This is where estimates go wrong, because ownership costs do not care how much you use the machine. Insurance, depreciation and finance run at the same rate whether the mini sits on the trailer or works two shifts.

A worked example

Illustrative figures, not a price list. The shape is the point:

• Ownership: $18,000 a year in depreciation, interest, insurance and storage
• Operating: $12,000 a year in fuel, service, wear parts and repairs
• Total: $30,000 a year

At 1,000 hours a year that machine costs $30 an hour. At 600 hours, the same machine with the same costs works out at $50 an hour. Nothing about the machine changed, only how much it was used.

That is also a better basis for a rent-versus-buy decision than a feeling about payments.

What to do with the number

Two things. Put it in your bids, so machine time is priced rather than absorbed. And put it in your job costing, so a finished job tells you what it actually consumed. A machine hour that never lands on a job is overhead you are recovering by accident, if at all.

Common questions

How do you calculate equipment cost per hour? Add a year of ownership costs (depreciation, interest, insurance, storage) to a year of operating costs (fuel, service, wear parts, repairs), then divide by the hours the machine actually works that year. Utilization matters as much as the costs, because ownership costs run whether the machine works or not.

Should I charge for a machine that is paid off? Yes. A paid-off machine still burns fuel, wears undercarriage, consumes service intervals and moves toward replacement. Not charging for it does not make the job cheaper, it moves the cost somewhere you cannot see it.

Why do two identical machines have different hourly costs? Usually utilization. Ownership costs are the same whether a machine runs 600 hours or 1,000, so the one that works less carries a higher cost per hour. Fuel, undercarriage wear in abrasive ground and repair history account for the rest.

Should the operator be included in the machine rate? Either way works if you are consistent. Most contractors keep the operator as labor and the machine as equipment, so both can be tracked against a job separately.

Is a rental rate a good substitute for my own cost? No. A rental rate carries the rental company overhead, profit and risk, and reflects their utilization rather than yours. It is a fair number to bill against and a useful sanity check, but it is not what the machine costs you.

What is the most commonly forgotten equipment cost? Undercarriage on tracked machines. It wears quietly, it is not on a service schedule the way oil is, and it arrives as a large bill that feels like bad luck rather than a cost that had been accruing by the hour.