Laser machine economics

How to calculate laser machine hourly cost

Machine hourly cost is a model of ownership and operation divided by useful production capacity. The most common mistake is dividing by every hour in the month instead of the hours the machine can realistically spend on productive work.

Define productive hours first

Calendar availability is not the same as billable or productive time. Maintenance, setup, test runs, material handling, downtime, learning, and idle periods reduce the hours available for useful production.

Monthly productive hours = available operating hours × utilization assumption

The utilization assumption should come from your records when possible. A higher assumed utilization spreads fixed ownership cost across more hours and lowers the modeled hourly rate. That makes utilization a sensitive input, not a harmless estimate.

Separate fixed ownership components

A planning model can include a depreciation or replacement reserve, recurring software or workspace allocations, and other machine-related fixed costs. The appropriate accounting and tax treatment may differ from a planning reserve, so keep those concepts separate.

Ownership cost per productive hour = monthly ownership allocation ÷ productive hours

Add maintenance and consumables

Lenses, mirrors, filters, tubes or sources, belts, lubrication, extraction components, and scheduled service vary by machine. Convert costs to the same time basis before combining them. If a component costs a known amount and has an estimated service life in productive hours, it can be modeled per hour.

Component cost per hour = replacement cost ÷ estimated productive life

Service life is uncertain. Use a cautious range rather than pretending one value is guaranteed.

Model energy from actual equipment

Rated laser power is not the same as total wall consumption. The laser, chiller, extraction, air assist, compressor, and supporting equipment may all contribute. Use measured or documented consumption and your current energy rate where available.

Energy cost per hour = total average kW × energy price per kWh

Combine the components

Machine-hour cost = ownership/hour + maintenance/hour + energy/hour + consumables/hour

This output is a cost input, not a customer selling price. A quote may also need material, waste, labor, overhead, selling fees, delivery, and margin.

Use scenarios instead of one false-precision answer

A low, base, and high scenario can expose which assumptions drive the result. Useful scenario variables include productive hours, maintenance reserve, energy price, average job contribution, and monthly fixed costs.

Adversarial check: If productive hours are zero or negative, the model must stop. Returning zero cost or an unexplained spreadsheet error would be misleading.

From hourly cost to monthly break-even

Job contribution is customer revenue minus costs that vary with the job. A simple break-even scenario divides monthly fixed cost by average positive contribution per job. It does not forecast how many jobs will arrive.

Break-even jobs = monthly fixed cost ÷ average contribution per job

If contribution is zero or negative, a finite positive break-even count does not exist. Change the assumptions or economics before trusting the scenario.

Inputs to verify

Purchase price or replacement reserve and chosen useful-life basis.
Realistic productive hours, not total calendar hours.
Maintenance and consumable cost with consistent units.
Total equipment energy consumption and current tariff.
Monthly fixed-cost and contribution assumptions.

Scope note: This is a planning framework, not accounting, tax, financing, investment, purchasing, or machine-safety advice. Verify every assumption against your own invoices, records, and machine documentation.