How Much Electricity Does a Laser Cutter Use? A Home Cost Example
A laser cutter costs very little to run compared with its material. Electricity use is power in kilowatts times hours, so a machine drawing 200 W for one hour uses 0.2 kWh. At an example rate of 0.15 dollars per kWh that is about 3 cents. Add the exhaust fan, air pump and chiller to get the real figure.
How much electricity does a laser cutter use? In plain terms, it is the total power draw of everything plugged in, multiplied by the hours the machine runs. A laser cutter is not a hungry appliance like a clothes dryer, and most home makers find their plywood costs far more than their power. But it helps to know the formula so you can price jobs honestly.
The formula
Energy (kWh) = power (kW) x time (hours). Cost = kWh x your electricity rate.
Your rate is on your bill, in cents or dollars per kWh, and it differs by state and utility. The examples below use an assumed 0.15 dollars per kWh purely to show the maths. Replace it with your own number.
What draws power in a laser setup
The laser tube or diode is only one part. Typical figures are rough, so read the plate on your equipment.
| Part | Typical draw (rough) | Notes |
|---|---|---|
| Diode laser module (10 W optical class) | Often tens of watts, up to about 100 to 150 W electrical | Optical output is much lower than electrical input |
| Control board, motors | Tens of watts | Small |
| CO2 laser (40 W class) | Several hundred watts | Check machine label |
| CO2 laser (60 to 100 W class) | Often 500 to 1,000+ W | Check label |
| Exhaust fan | 50 to 300 W | Often forgotten |
| Air assist pump | 20 to 100 W | Small |
| Water chiller (CO2) | 100 to several hundred W | Runs the whole job |
The important idea is that optical power is not electrical power. A 10 W diode laser does not use 10 W from the wall; a 40 W CO2 tube needs far more electrical power to produce its beam.
Worked example
Take our reindeer ornament, which cuts in about 1 min 48 s on a 10 W diode and 44 s on a 40 W CO2. Assume the diode setup draws about 150 W in total and the CO2 setup, including fan and chiller, about 800 W.
| Setup | Time for 9 ornaments (one 300 x 400 mm sheet) | Power draw (assumed) | Energy | Cost at 0.15 per kWh |
|---|---|---|---|---|
| 10 W diode | about 16 min 12 s (9 x 1 min 48 s) | 0.15 kW | about 0.04 kWh | about 0.6 cents |
| 40 W CO2 | about 6 min 36 s (9 x 44 s) | 0.8 kW | about 0.09 kWh | about 1.3 cents |
Even at generous guesses, an entire sheet of ornaments costs about a cent or two in electricity. Add idle time, warm-up and the exhaust fan running afterwards, and you may double it. It is still smaller than the cost of a single plywood ornament blank. For material costs see how much does it cost to make a laser ornament.
Factors that change your bill
- Machine type. CO2 with a chiller draws more than a small diode.
- Run time. Engraving large areas takes hours, cutting is quick.
- Idle time. Leaving everything on while you design adds up.
- Your rate. Time-of-use pricing may cost more in the evenings.
- Other equipment. Dust collectors, compressors and computers.
Quick check with a plug meter
A plug-in power meter between the wall and a power strip shows actual watts and cumulative kWh. Run a typical job and read the number. That one measurement replaces every guess in this article.
| Step | Action |
|---|---|
| 1 | Plug laser, fan, pump and chiller into one metered strip (within the outlet rating) |
| 2 | Reset the meter, run one real job |
| 3 | Note kWh used and minutes |
| 4 | Multiply by your rate |
Next step
For pricing, add a small flat "machine and power" amount per job and spend your effort on material, time and waste. See how to price laser cut products.
Questions and answers
Does a 40 W laser use 40 watts of electricity?
No. The 40 W figure is optical output. The machine and its power supply draw several times more from the wall.
Is the laser or the exhaust fan the bigger cost?
On a diode setup the fan can be a meaningful part. On CO2, the laser supply and chiller usually dominate.
How can I measure my laser cutter electricity use?
Use a plug-in watt meter on the strip that powers everything and read kWh after a typical job.
Should I include electricity when pricing products?
Yes, but keep it a small flat allowance. Material, labour time and fees matter more.
Will a laser cutter noticeably raise my power bill?
For hobby use, usually not. Heavy daily CO2 use raises it more, but it is still small next to material costs.
What rate should I use in calculations?
Your own, from your bill, because it varies by state and utility.