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Finance Calc Kit
Business

Units of Production Depreciation Calculator

Calculate asset depreciation based on units of production or activity level with per-unit cost and period depreciation.

Asset details

$
$

Period depreciation expense

$5,666.67

28.3% of estimated useful miles

Depreciable base

$20,000.00

Depreciation per miles

$0.33

Depreciable base allocation

  • Period depreciation$5,666.6728.3%
  • Remaining depreciable base$14,333.3371.7%

How we calculated this

Open to see each step from your inputs to the result.

  1. Depreciable base

    Depreciable Base=Asset Cost−Salvage Value\text{Depreciable Base} = \text{Asset Cost} - \text{Salvage Value}

  2. Depreciation per Miles

    Per Unit=Depreciable BaseUseful Miles\text{Per Unit} = \frac{\text{Depreciable Base}}{\text{Useful Miles}}

  3. Period depreciation

    Depreciation=Miles Used×Per Unit Rate\text{Depreciation} = \text{Miles Used} \times \text{Per Unit Rate}

Report tool

What is units of production depreciation?

The units of production method, also called the activity method, allocates depreciation based on actual usage rather than calendar time. Machinery, vehicles, and equipment wear out in proportion to miles driven, hours operated, or units manufactured. This approach matches expense recognition to economic benefit and is common when asset utilization varies significantly year to year.

For a full comparison across straight-line, declining balance, and sum-of-the-years digits, use the depreciation calculator. To track cumulative book value after multiple periods, the accumulated depreciation calculator complements this activity-based view. For vehicle-specific mileage schedules, the car depreciation calculator models market value decline alongside accounting methods.

Units of production formula

Depreciable Base=Asset Cost−Salvage Value\text{Depreciable Base} = \text{Asset Cost} - \text{Salvage Value}
Depreciation per Unit=Depreciable BaseEstimated Useful Units\text{Depreciation per Unit} = \frac{\text{Depreciable Base}}{\text{Estimated Useful Units}}
Period Depreciation=Units Used in Period×Depreciation per Unit\text{Period Depreciation} = \text{Units Used in Period} \times \text{Depreciation per Unit}

Depreciation stops once the asset reaches salvage value. If actual usage in a period exceeds the remaining depreciable base divided by the per-unit rate, expense is capped at the remaining depreciable amount.

Worked example

A delivery vehicle costs $22,000 with an expected salvage value of $2,000. Management estimates 60,000 useful miles over the asset life. During the current period the fleet logs 17,000 miles:

  • Depreciable base: $22,000 - $2,000 = $20,000
  • Depreciation per mile: $20,000 / 60,000 = $0.3333
  • Period depreciation: 17,000 x $0.3333 = $5,666.67
  • Remaining depreciable base after the period: $14,333.33

Low-mileage years produce smaller expense than high-utilization years, which aligns reported profit with wear on the asset. Pair this with operating metrics from the operating expense ratio calculator when building a full cost picture for equipment-heavy businesses.

Frequently asked questions

When should I use units of production instead of straight-line?
Use activity-based depreciation when wear is driven by usage (miles, machine hours, units produced) rather than the passage of time alone.
Can salvage value be zero?
Yes. If you expect no residual value, enter zero and the entire asset cost becomes the depreciable base.
What happens if I exceed estimated total useful units?
Period depreciation is capped at the remaining depreciable base. Once salvage value is reached, no further depreciation is recorded.
Does this replace tax depreciation schedules?
No. Tax rules such as MACRS may differ from book depreciation. Use this calculator for management accounting and financial modeling.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.