Equipment Cost Examples

Step-by-step calculations for ownership depreciation, operating costs, and overall hourly rates.

Example 1: Straight-Line Depreciation

Calculating the annual and hourly depreciation charge using the straight-line method.

A contractor purchases a new heavy-duty excavator for USD250,000USD 250,000. It is expected to have a useful life of 5 years5 \text{ years} and an estimated salvage value of USD50,000USD 50,000 at the end of its life. The contractor plans to use the machine for 2,000 hours2,000 \text{ hours} per year.

Calculate the annual depreciation charge using the Straight-Line method, find its book value after 3 years3 \text{ years}, and determine the hourly depreciation rate to be included in an estimate.

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Example 2: Double Declining Balance (DDB) Depreciation

An accelerated depreciation calculation often used for tax strategies or equipment that loses value rapidly.

A company buys a bulldozer for USD300,000USD 300,000. It has a 5-year5\text{-year} useful life and a USD50,000USD 50,000 estimated salvage value. While straight-line depreciation is common for internal hourly rates, the Double Declining Balance (DDB) method applies a fixed percentage rate (twice the straight-line percentage) to the remaining book value each year. Note that DDB does not initially subtract the salvage value when calculating the base.

Calculate the depreciation charge for Year 1 and Year 2 using the DDB method.

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Example 3: Calculating Operating Costs (Fuel and Lube)

Estimating the hourly cost of consumables based on engine horsepower and load factors.

A motor grader with a 250 HP250 \text{ HP} diesel engine operates under an average load factor of 60%60\%. The engine consumes approximately 0.04 gallons0.04 \text{ gallons} of diesel fuel per horsepower-hour at full load. Diesel fuel costs USD4.00USD 4.00 per gallon on-site. The manufacturer recommends estimating lubrication (oil, grease, filters) as 33%33\% of the hourly fuel cost.

Calculate the total hourly cost for fuel and lubrication.

Step-by-Step Solution

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Example 4: Comprehensive Hourly Equipment Rate Calculation

Combining Ownership (Depreciation, IIT) and Operating Costs (Fuel, Wear Parts) into a single rate.

An estimator is calculating the internal hourly charge rate for a front-end loader. The machine data is as follows:

  • Initial Cost: USD180,000USD 180,000

  • Useful Life / Salvage: 10,000 hours10,000 \text{ hours} / USD30,000USD 30,000

  • Interest, Insurance, Taxes (IIT): estimated flat rate of USD4.50/hourUSD 4.50/\text{hour}

  • Fuel & Consumables: calculated at USD18.00/hourUSD 18.00/\text{hour}

  • Tires: A set of 44 tires costs USD12,000USD 12,000 and lasts 2,500 hours2,500 \text{ hours}.

  • Routine Repairs/Maintenance: estimated at USD8.00/hourUSD 8.00/\text{hour}

Calculate the total, unburdened (no operator wage) hourly equipment rate for the loader.

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Key Takeaways
  • Equipment costs are strictly divided into Ownership Costs (fixed, occurs whether machine runs or not) and Operating Costs (variable, occurs only when running).
  • Straight-line depreciation provides uniform deductions per hour, ideal for internal estimating rates.
  • Double Declining Balance effectively accelerates depreciation, creating higher initial deductions but ignoring initial salvage value in the base calculation.
  • Major wear items like tires or undercarriages are often stripped from the initial cost and depreciated separately based on their shorter lifespans.