3D Printer Electricity Cost Calculator

Find out what your printer costs to run per hour, per month and per year — and why the number on the power supply is not the number to use.

Running cost by hour, month and year

Printer draw while printing (W)

Measure with a plug meter, not the nameplate.

Electricity rate ($/kWh)

Printing hours per day

Printing days per month

Cost per hour	—
Cost per day	—
Cost per month	—
Cost per year	—
Energy per month (kWh)	—

The formula and why it is simple

Electricity cost is the easiest part of print costing to calculate and the most commonly skipped. There is one conversion — watts to kilowatts — and one multiplication:

kWh used  = (watts ÷ 1000) × hours
cost      = kWh × rate per kWh

A 150 W printer running eight hours uses 1.2 kWh. At $0.28 per kWh that is about 34 cents a day, roughly $7.40 for a 22-day month, and around $89 a year if you keep that pace up. That is real money, but on its own it is also a small fraction of a part's cost — the point of including it is accuracy, not alarm.

Do not use the power supply rating

The sticker on the power supply gives a maximum output, not a typical draw. A machine supplied by a 350 W brick usually averages well below that while printing, because the bed heater cycles on and off and the motors are not continuously loaded. Using the nameplate figure systematically overstates your electricity cost, sometimes by a factor of two.

The reliable way to get the number is a plug-in power meter left on the printer for one representative job. It costs very little, gives you the real average, and also tells you the warm-up spike from the heated bed. If you cannot measure, the table below is a reasonable starting point — then adjust once you have data.

Typical power draw by printer class

Printer class	Typical average draw	What drives it
Small bedslinger	60 – 90 W	Small bed, modest heater.
Standard bedslinger	120 – 180 W	The most common category; around 150 W is typical.
Enclosed CoreXY	200 – 350 W	Chamber heater plus faster motion.
Large format	350 – 500 W	Bed area dominates.
MSLA / DLP resin	30 – 80 W	LCD panel and minimal heating; add curing.
Idle, bed warm	15 – 40 W	Worth switching off between jobs.

These are indicative averages for common machine classes, not measurements of any specific model. Wattage also rises with ambient temperature — a printer in a cold garage works harder to hold bed temperature than the same printer indoors.

Where the energy actually goes

Bed warm-up. The most power-hungry phase. On short prints it can be a third of the total energy, which is why batching several small parts onto one plate is so effective.
Holding bed temperature. The heater cycles throughout the job. Higher bed temperatures for ABS and nylon cost noticeably more than PLA's 60 °C.
Hotend. Typically 30 to 60 W while held at temperature, cycling rather than continuous.
Motors and electronics. The smallest slice on most machines, though high-speed CoreXY motion systems use more than a slow bedslinger.
Idle time. A printer left on with a warm bed between jobs burns power for nothing. This is the easiest saving available.

Six ways to cut the power bill

Batch small parts onto one plate. One warm-up instead of five.
Lower bed temperature where the material allows. PLA rarely needs 70 °C; 55 to 60 °C usually holds fine and cycles less.
Turn the machine off when it finishes. An idle warm bed overnight can cost more than a short print.
Insulate the bed underside. Cheap, effective, and shortens warm-up.
Print in a warm room. Less heat lost to the environment means less heater duty.
Do not over-specify the enclosure heater. For PLA a passively warmed chamber is usually enough.

Frequently asked questions

How much electricity does a 3D printer use per hour?

Most common FDM printers average between 0.12 and 0.18 kWh per hour of printing. At $0.28/kWh that is roughly three to five cents an hour. Large enclosed machines and large-format printers can be two to three times that.

Is it expensive to leave a 3D printer running overnight?

An eight-hour print at 150 W costs roughly 34 cents in energy. Leaving the machine idle with the bed warm for the eight hours afterwards can cost almost as much for no output, so switching off at the end of a job is worthwhile.

Does the heated bed or the hotend use more power?

The bed, by a wide margin. A typical bed heater draws well over 100 W during warm-up while the hotend sits around 30 to 60 W when holding temperature. Bed temperature is the single biggest lever on energy use.

How do I find my actual kWh rate?

It is on your electricity bill, usually as a cents-per-kWh figure. If you are on a time-of-use tariff, use the rate that applies when you actually print — scheduling long jobs for off-peak hours can be a genuine saving at scale.