Machine Hour Rate Calculator

About the Machine Hour Rate Calculator

The machine hour rate is the total cost of operating a machine for one hour, including depreciation, power consumption, maintenance, and the floor space it occupies. Manufacturers use this rate to allocate machine-related overhead to jobs based on how many hours each job spends on a particular machine.

In capital-intensive manufacturing — CNC machining, injection molding, stamping, printing — machine costs often exceed labor costs. Knowing the hourly cost of each machine enables accurate job quoting, make-vs-buy analysis, and capital investment decisions. A machine with a $150/hour rate that sits idle for half the shift represents $600 per shift in unrecovered cost.

This calculator sums four key cost components — depreciation, power, maintenance, and space — and divides by annual available machine hours to produce the machine hour rate. Understanding this rate helps you price machine time accurately and identify the true cost of equipment underutilization.

This measurement forms a critical foundation for capacity planning, helping teams align production capabilities with demand forecasts and strategic business objectives throughout the planning cycle.

When This Page Helps

Machine hour rates translate capital investments into per-hour costs that can be assigned to jobs. They reveal the true cost of idle capacity, help compare the economics of different machines, and ensure quoting covers all equipment-related expenses.

How to Use the Inputs

1. Enter annual depreciation cost for the machine.
2. Enter annual power/electricity cost for the machine.
3. Enter annual maintenance cost (parts + service labor).
4. Enter annual space cost (floor area × building cost per sq ft).
5. Enter available machine hours per year (after planned downtime).
6. Review the machine hour rate and cost component breakdown.

Example Calculation

Tips & Best Practices

• Use net book value or replacement cost for depreciation depending on your company's policy.
• Meter actual power consumption rather than estimating — machines vary widely.
• Include both preventive and corrective maintenance costs.
• Calculate available hours as total shift hours minus planned downtime, holidays, and maintenance.
• Compare rates across similar machines to identify high-cost equipment.
• Factor in tooling costs for machines with expensive consumable tooling.

Depreciation Methods for Machine Hour Rates

Straight-line depreciation spreads the machine's cost evenly over its useful life. For a $200,000 machine with a 10-year life and $20,000 salvage value, annual depreciation is ($200,000 − $20,000) / 10 = $18,000. Some companies use replacement cost depreciation, which bases the annual charge on what it would cost to replace the machine today, providing a more realistic cost figure.

Power Cost Estimation

Power cost depends on the machine's motor size, load factor, duty cycle, and electricity rate. A 50 kW motor running at 75% load for 4,000 hours at $0.10/kWh costs 50 × 0.75 × 4,000 × $0.10 = $15,000/year. Sub-metering individual machines provides the most accurate data.

Using Machine Hour Rates for Investment Decisions

When evaluating a new machine purchase, calculate its projected machine hour rate and compare it to the existing machine. If the new machine has a higher rate but is faster, the cost per part may still decrease. Always compare cost per part, not just cost per hour.

Frequently Asked Questions

• What costs are included in machine hour rate?

  The four standard components are depreciation (or lease cost), power/electricity, maintenance (preventive and corrective), and space (floor area cost). Some companies also include tooling, coolant, compressed air, and insurance.

• How do I calculate available machine hours?

  Start with total shift hours per year. Subtract planned maintenance downtime, holidays, and any scheduled non-production time. For example: 2 shifts × 8 hours × 250 days = 4,000 hours. Subtract 200 hours for maintenance = 3,800 available hours.

• Should I use straight-line or accelerated depreciation?

  For machine hour rate purposes, straight-line depreciation is most common because it produces a stable rate. Using accelerated depreciation causes the rate to be higher in early years and lower later, which can distort product costing.

• How does idle time affect the machine hour rate?

  The rate is calculated based on available hours, not actual utilization. If a machine runs 3,000 hours but its rate is based on 4,000 available hours, 1,000 hours of cost are unrecovered. Some companies calculate a separate "idle time" cost to make this visible.

• Can machine hour rate replace a plant-wide overhead rate?

  Machine hour rates handle machine-related overhead very well but don't cover all overhead (e.g., front office, plant management). Many companies use machine hour rates for production and a separate burden rate for remaining overhead.

• How often should machine hour rates be recalculated?

  Recalculate annually during budgeting. Update mid-year if significant changes occur — major repairs, energy price spikes, or changes in available hours due to shift additions or reductions.