3D printer electricity cost calculator: kWh and cost per print

The formula

Every method ends in the same two lines:

kWh per print  = average watts × job hours ÷ 1000
cost per print = kWh per print × price per kWh

The three methods differ only in where the average watts come from.

• Measured average watts. Read the average from a smart plug energy monitor. Job hours are the print time plus warm-up.
• Measured kWh. Read the plug’s energy counter before and after the print. Nothing is estimated, so this is the most accurate input.
• Estimated from components. Add up each part’s rated watts times its duty cycle, then add a warm-up phase where the heaters run flat out:

steady watts = bed W × bed duty + hotend W × hotend duty + electronics W + chamber W
warm-up watts = bed W + hotend W + electronics W + chamber W
kWh = (warm-up watts × warm-up hours + steady watts × print hours) ÷ 1000

Cost per hour divides the print’s cost by the whole job time, warm-up included. The monthly line multiplies one print by your prints per month. For a print farm, set prints per month to the total across all machines, or run the calculator once per printer model and add the results.

Where the defaults come from

The default price is $0.179 per kWh. The U.S. Energy Information Administration (EIA) reports an average residential price of 17.90 cents per kWh for the 12 months ending June 2026 in Electric Power Monthly Table 5.3. Your own bill may sit far from that: the same release shows June 2026 residential prices from about 13 cents in Nebraska to over 29 cents in New York and Massachusetts. Use the rate printed on your bill, including delivery charges.

The estimated defaults come from one publicly measured printer. Innosek logged a Creality CR-10S printing PLA at a 200 °C hotend and a 60 °C bed. After warm-up, the draw swung between roughly 55 W and 280 W as the bed heater switched on and off, and it averaged 130.09 W over a two-minute sample. So the bed adds about 225 W when on, which is the calculator’s default bed rating.

The 55 W floor covers the hotend, motors, fans and board together. The calculator splits it as 35 W of electronics plus a 40 W hotend cartridge (the size of E3D’s standard heater) at 50% duty. Only the 55 W total was measured, so the split is yours to change.

Warm-up defaults to 5 minutes. Innosek’s heat-up finished at about 315 seconds and used 0.0268 kWh, an average of 306 W. The calculator’s warm-up phase runs bed, hotend and electronics at 300 W, close to Innosek’s figure.

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

Desktop FDM (fused deposition modeling) printers use about 0.08 to 0.2 kWh per hour. Prusa measures 80 W on PLA and 120 W on ABS for its MK series. Bambu Lab lists 75 W to 200 W for its A1 mini, A1, P1 and X1 Carbon. At the EIA average price, that is 1.4 to 3.6 cents an hour.

Published averages by printer and material

Printer	PLA	ABS	Source
Prusa MK series	80 W	120 W	Prusa Knowledge Base, at 26 °C room temperature
Bambu Lab A1	95 W	200 W	Bambu Lab Wiki
Bambu Lab P1P	110 W	170 W	Bambu Lab Wiki
Bambu Lab P1S	105 W	140 W	Bambu Lab Wiki
Bambu Lab X1 Carbon	105 W	150 W	Bambu Lab Wiki
Creality CR-10S	130 W	not measured	Innosek

Bambu Lab lists 80 W for the A1 mini on PLA and 75 W on PETG. Larger machines sit higher: the same wiki gives the H2D 197 W on PLA and 395 W on PC.

Idle draw is small by comparison. Bambu Lab lists 4 to 10 W on Wi-Fi standby for the A1, P1 and X1 Carbon. A printer left on overnight between jobs adds tenths of a kWh, not whole ones.

Do 3D printers use a lot of electricity?

No. A printer averaging 130 W for a 4-hour job uses about half a kWh, roughly what a 1,500 W space heater uses in 20 minutes. Bed temperature drives the bill. ABS runs the bed 40 °C hotter than PLA, and the Prusa and Bambu Lab figures above rise by a third to more than double between the two materials.

How many watts does a 3D printer use?

A desktop 3D printer averages 80 to 200 W while printing and draws more while it heats up. Prusa measures 80 W on PLA for its MK series, and Bambu Lab lists 95 to 105 W for the A1, P1S and X1 Carbon. Its 110 V maximums run from 150 W for the A1 mini to 350 W.

Average, standby and maximum watts by printer

Printer	Average, printing PLA	Standby	Maximum on 110 V	Source
Bambu Lab A1 mini	80 W	6.1 to 7.3 W	150 W	Bambu Lab Wiki
Bambu Lab A1	95 W	4.1 to 5.4 W	350 W	Bambu Lab Wiki
Bambu Lab P1S	105 W	5.8 to 6 W	350 W	Bambu Lab Wiki
Bambu Lab X1 Carbon	105 W	8.7 to 9.9 W	350 W	Bambu Lab Wiki
Bambu Lab H2D	197 W	25 to 27 W	1,250 W	Bambu Lab Wiki
Prusa MK4S	80 W	not published	240 W power supply	Prusa product page
Prusa CORE One	90 W	not published	240 W power supply	Prusa product page

Bambu Lab’s standby figures are with Wi-Fi on. Its maximums are higher on 220 V supplies: 1,000 W for the P1S and X1 Carbon, 1,300 W for the A1. Prusa publishes the rating of the power supply, which caps what the printer can draw, rather than a measured maximum.

Average watts set the bill, peak watts set the wiring

The average is what the formula at the top of this page multiplies by hours. A printer averaging 100 W uses 0.1 kWh an hour, so a 10-hour print uses about 1 kWh. Peak draw is short, mostly while the bed and hotend heat from cold. It decides whether a circuit trips, not what a print costs. The circuit capacity calculator checks peaks against a breaker.

3D printer idle power consumption

A printer left on between jobs draws its standby figure. At 6 W, a day of standby is 0.14 kWh, about 3 cents at the EIA average price. The H2D’s 25 W standby comes to 0.6 kWh a day, about 11 cents. Turning a printer off overnight saves little on a small machine and more on a large one.

How many watts does a heated bed draw at temperature?

A heated bed draws its full rating only while the heater is switched on. Averaged over time it uses much less. On Innosek’s CR-10S at 60 °C, the bed switched about 225 W and was on about 33% of the time, so it averaged roughly 75 W. Hotter beds stay on longer and average more.

Rated wattage grows with bed size. The CR-10S bed switched about 225 W, while the 350 mm Voron builds below carried 500 W and 750 W AC heaters. One Voron forum member measured a 350 mm build with a 750 W bed and a Rapido hotend: about 1,000 W with both heaters at 100% during warm-up. Over the next 20 minutes the draw fell to 350 to 400 W and then to 150 to 260 W. Another member measured 200 to 250 W while printing on a 350 mm build with a 500 W bed at 95 °C.

AC vs DC heated bed power draw

AC and DC beds of the same size and temperature use about the same energy per print, because they lose the same heat to the room. An AC bed runs straight from mains voltage through a solid-state relay. A DC bed runs from the printer’s 12 V or 24 V power supply.

The AC bed warms up faster because it has more watts available, then spends a smaller fraction of time switched on. The only difference left is the power supply’s conversion loss on the DC side.

Do bigger heated beds use more power?

Yes. A larger plate loses heat from more area, so it needs more average watts to hold the same temperature. Doubling the plate’s area roughly doubles the holding power.

Insulating a heated bed to save power

Insulation on the underside cuts the heat lost downward. The bed then holds temperature at a lower duty cycle, and the saving shows up in the bed term of the formula. How much you save depends on how bare the underside was. Measure before and after with a smart plug on the same print.

What is a heated bed’s duty cycle and how does it change the real cost?

Duty cycle is the fraction of time a heater is switched on. A 225 W bed at 33% duty averages 225 × 0.33 = 74 W, and your bill follows that average, not the rating. The rating only decides how fast the bed heats and the peak current at the outlet.

Duty cycle explained with math

Firmware holds a temperature by pulsing the heater. Once the bed is at temperature, the heat it gives off to the room equals the heat going in:

holding watts = rated watts × duty cycle
duty cycle    = holding watts ÷ rated watts

Innosek’s readings give the duty cycle directly. The printer swung between 55 W (bed off) and 280 W (bed on) and averaged 130.09 W:

duty = (130.09 − 55) ÷ (280 − 55) = 75.09 ÷ 225 = 0.334

Heat loss grows with the gap between bed and room temperature (Newton’s law of cooling). The material presets scale that measured 33.4% by the temperature rise over a 25 °C room:

duty at T = 0.334 × (T − 25) ÷ (60 − 25)

Material	Bed temperature used	Bed duty cycle set
PLA	60 °C	33%
PETG	80 °C	52%
Nylon (PA)	90 °C	62%
ABS	100 °C	72%
ASA	100 °C	72%
PC	110 °C	81%

The bed temperatures sit inside the ranges in Prusa’s filament material guide (PLA 50 to 60 °C, PETG 70 to 90 °C, ABS 95 to 110 °C, ASA 90 to 110 °C, PC 100 to 115 °C, PA 70 to 115 °C). The duties describe the measured CR-10S bed in an open room. A bigger heater reaches the same holding watts at a lower duty, and an enclosure lowers it further. Bambu Lab reports the P1S rising only from 105 W to 140 W between PLA and ABS, against 110 W to 170 W for the open P1P.

As a check, the model predicts the CR-10S would average 55 + 0.72 × 225 = 217 W on ABS, 1.67 times its PLA figure. The published ABS-to-PLA ratios run from 1.33 (P1S) to 2.1 (A1), so the estimate lands inside that range. Treat presets as a starting point and replace them with a measured number when you have one.

120V vs 240V heated bed running cost comparison

Voltage does not change running cost. A 750 W heater converts 750 W to heat whether it runs on 120 V or 240 V, and the meter bills kWh. At 240 V the current is half, which matters for the circuit and not for the bill. Checking whether an outlet can carry a bed is the job of the circuit capacity calculator. Adding a 240 V outlet is work for a licensed electrician.

How do you calculate the electricity cost of one print?

Multiply the printer’s average watts by the job time in hours, divide by 1,000 to get kWh, then multiply by your price per kWh. A printer averaging 129 W over a 4-hour print, plus 5 minutes of warm-up at 300 W, uses 0.542 kWh. At $0.179 per kWh that print costs about 9.7 cents.

Worked example with the defaults

The calculator’s defaults are the estimated method, PLA, a 4-hour print and 30 prints a month.

1. Steady watts: 225 × 0.33 + 40 × 0.50 + 35 + 0 = 74.25 + 20 + 35 = 129.25 W.
2. Warm-up watts: 225 + 40 + 35 = 300 W for 5 minutes, which is 300 × 5 ÷ 60 = 25 Wh.
3. Printing: 129.25 W × 4 h = 517 Wh.
4. Energy: 25 + 517 = 542 Wh = 0.542 kWh.
5. Cost: 0.542 × $0.179 = $0.097 per print.
6. Cost per hour: $0.097 ÷ 4.083 h = $0.024.
7. Per month: 30 × 0.542 = 16.3 kWh, which costs $2.91.

Switch the material to ABS and the bed duty moves to 72%. Steady watts become 162 + 20 + 35 = 217 W, and the same 4-hour job uses 0.893 kWh, about 16 cents.

How to measure 3D printer power draw with a smart plug

1. Plug the printer into a smart plug energy monitor rated for the printer’s maximum draw.
2. Note the plug’s kWh counter, or reset it, before you start the print.
3. Run a typical job from a cold start so warm-up is included.
4. At the end, read the kWh used and enter it with the “Measured kWh” method.
5. Repeat for each material you print often. Bed temperature changes the result more than anything else.

A plug that shows only live watts is less useful: the reading jumps as heaters switch. Use the average over the job, or the energy counter.

Cost per print including electricity

Electricity is usually the smallest line in a print’s cost. Filament, machine wear and failed prints add more. The print cost calculator combines them; enter the figure from this page as its electricity input.

Which part of a 3D printer uses the most electricity?

The heated bed. Innosek’s measured CR-10S shows the bed drawing the most current, and in this calculator’s default PLA print the bed takes 58% of the energy. Published averages climb with bed temperature: Prusa’s MK series goes from 80 W on PLA to 120 W on ABS.

Part	Typical rating	Average while printing	Basis
Heated bed	225 W on the CR-10S, 500 to 750 W on 350 mm Voron beds	about 75 W at 60 °C on the CR-10S	Innosek measurement; Voron forum measurements
Hotend	40 W for E3D’s standard cartridge	a fraction of its rating	E3D; measure with firmware heater power readouts
Board, motors, fans	not rated separately	part of the 55 W floor on the CR-10S	Innosek measurement
Chamber heater	varies by model	depends on enclosure and target temperature	measure or size it separately

A hotend holds 200 °C on far fewer watts than a bed holds 60 °C because its tiny surface loses little heat. The bed is a large flat plate open to the room.

A chamber heater can rival the bed on enclosed high-temperature printers. Enter its average draw in the chamber field; sizing one for an enclosure is covered in the chamber heater calculator.