How to Calculate the Hourly Cost of a CNC Machine
Machine hourly cost is the foundation of every quote. Yet many shops estimate it by gut feeling. Here's the complete formula with a numerical example on a real machining center.
Why hourly cost is the most important number in your shop
Every quote that leaves your shop rests on one number: the hourly cost of your machines. If that number is wrong by 15%, all your quotes are wrong by 15% — and you won't notice until year-end when the books don't balance.
Many Italian shops still use 'historical' rates (the classic 45 €/h for the lathe, 60 €/h for the 5-axis mill) set years ago and never recalculated. Meanwhile energy has doubled, the machine has depreciated and the operator costs more.
The complete hourly cost formula
The true hourly cost of a CNC machine consists of 5 items. The formula is: Hourly cost = (Depreciation + Energy + Maintenance + Floor space + Operator allocation) / Annual productive hours.
- ■ Depreciation: purchase price divided by useful life years (typically 7-10 years for a machining center), divided by annual productive hours.
- ■ Energy: average power draw (kW) × kWh cost × utilization factor. A 25 kW machining center running at 60% draws ~15 kW effective.
- ■ Maintenance: routine + extraordinary. Rule of thumb: 3-5% of machine value per year.
- ■ Floor space: square meters occupied × cost per sqm of facility (rent or building depreciation) / annual hours.
- ■ Operator allocation: company cost of operator divided by number of machines monitored simultaneously.
Numerical example: 5-axis machining center
Take a 5-axis machining center purchased at 280,000 €, useful life 8 years, 1,600 productive hours/year. Depreciation: 280,000 / 8 / 1,600 = 21.90 €/h. Energy: 18 kW average × 0.28 €/kWh = 5.00 €/h. Maintenance: 280,000 × 4% / 1,600 = 7.00 €/h. Floor space: 40 sqm × 90 €/sqm/year / 1,600 = 2.25 €/h. Operator (1 on 2 machines): 42,000 € / 1,600 / 2 = 13.10 €/h.
Total: 49.25 €/h pure cost. Below this threshold you work at a loss. Adding a 30% commercial margin you reach a selling rate of ~64 €/h. If today you sell that machine at 55 €/h, you're giving away 15%.
The productive hours mistake
The most common error is dividing by theoretical hours (220 days × 8 hours = 1,760) instead of actually productive ones. Between setups, tooling changes, maintenance and waiting, a machine averages 65-75% of hours in cut. Dividing by too high a number artificially lowers the hourly cost and inflates margins on paper.
How MachinePilot automates this
In MachinePilot every machine in your shop has its own card with hourly rate: you can enter it manually or start from pre-calibrated rates of the 214 catalog models (updated market averages). Each quote then uses the rate of the ACTUAL machine that will do the job — not a generic average — and shows you the effective margin operation by operation.