Calculating the Machine Hour Rate (MHR) is one of the most critical accounting tasks for any CNC machine shop or manufacturing facility. Without an accurate hourly rate, you risk underquoting jobs (losing money) or overquoting (losing customers). This tool replicates the logic typically found in complex "CNC machine hour rate calculation xls" templates, breaking down fixed and variable costs into a single hourly figure.
Step 1: Capital & Depreciation (Fixed Costs)
Total landed cost of the CNC machine.
Expected years of operation before replacement.
Estimated value at the end of its useful life.
Standard shift: 40hrs/week × 50 weeks = 2000 hrs.
Step 2: Operational & Variable Costs
Spares, coolant, repairs, tooling.
Average kilowatt draw during operation.
Step 3: Overhead Allocation
Rent, insurance, admin allocated to this machine.
Hourly Rate Breakdown
Depreciation Cost (Hourly):–
Power Consumption (Hourly):–
Labor Cost (Hourly):–
Maintenance & Consumables (Hourly):–
Overhead Allocation (Hourly):–
Total Machine Hour Rate:–
Understanding the CNC Machine Hour Rate Calculation
The "Machine Hour Rate" (MHR) is the total cost incurred to run a specific machine for one hour. It serves as the foundation for job costing and price estimation in manufacturing. Whether you are running a 3-axis mill or a 5-axis lathe, the formula generally involves aggregating all direct and indirect costs and dividing them by the total hours the machine is available for productive work.
Key Components of the Calculation
Depreciation (Fixed Cost): Machines lose value over time. We calculate this by taking the purchase price, subtracting the salvage value (what you can sell it for later), and dividing by the total useful life in hours.
Power Consumption (Variable Cost): CNC machines consume significant electricity. The cost depends on the spindle load, the machine's power rating (in kW), and your local energy tariff ($/kWh).
Operator Labor: This is often the largest component. If an operator runs multiple machines, you might divide their wage by the number of machines (e.g., 0.5 wage per machine).
Maintenance & Consumables: Coolant, oil, cutting inserts, and repair technicians are ongoing costs that must be amortized into an hourly figure.
Overhead: This captures the cost of the factory floor space (rent), lighting, administration, and insurance allocated specifically to the footprint of the machine.
Why XLS Formulas Matter
Many shop managers use Excel (XLS) sheets to track these metrics because costs fluctuate. For example, if your electricity rates rise or you run a double shift (increasing annual hours), your MHR changes. By increasing the Annual Operating Hours in the calculator above, you will notice the Depreciation and Overhead per hour decrease significantly. This demonstrates the economic advantage of high utilization rates in manufacturing.
How to Use This Data
Once you have your Total Machine Hour Rate (e.g., $75.00/hr), you can estimate jobs accurately. If a part takes 2 hours to machine: