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Laser Power Calculator

Power percentage, speed, and passes for laser cutting and engraving

Settings

80% @ 10 mm/s

Time

1m

Passes

1

Recommended Settings

80% power

10 mm/s, 1 pass

Watts

32W

Time

1m

Type

cut

Details

Energy1 Wh (~$0)

Example Calculations

13mm plywood cut on 40W CO2

Inputs

MaterialPlywood 3mm
Laser40W CO2

Result

Settings80% @ 10 mm/s, 1 pass

Standard settings for 40W CO2 laser cutting 3mm plywood.

2Wood engraving 200x200mm

Inputs

MaterialWood (Engrave)
Area200x200 mm

Result

Time~22 min
Settings30% @ 300 mm/s

(200/0.1) * 200 / 300 = 1333s = 22 min at 0.1mm line spacing.

Frequently Asked Questions

Q

What power and speed should I use for laser cutting plywood?

3mm plywood on a 40W CO2: 80% power at 10 mm/s in 1 pass. 6mm needs 100% at 5 mm/s with 2 passes. Diode lasers need proportionally more passes.

  • 3mm plywood, 40W CO2: 80%, 10 mm/s, 1 pass
  • 6mm plywood, 40W CO2: 100%, 5 mm/s, 2 passes
  • 3mm plywood, 10W diode: 100%, 2 mm/s, 3 passes
  • Always test on scrap material first
MaterialPower %SpeedPasses
Plywood 3mm80%10 mm/s1
Acrylic 3mm90%8 mm/s1
Leather 2mm40%15 mm/s1
Fabric20%30 mm/s1
Q

What is the difference between diode and CO2 lasers?

CO2 lasers (40-100W) cut thicker materials and engrave faster. Diode lasers (5-20W optical) are cheaper but slower and limited to thinner materials. CO2 excels at acrylic; diodes work well on wood.

  • CO2: 40-100W, cuts up to 20mm wood
  • Diode: 5-20W optical, cuts up to 6mm
  • CO2: best for acrylic (clean edge)
  • Diode: best value for wood crafts
Q

How do I calculate engraving time?

Engraving time depends on area, speed, and line spacing (line interval). Time = (area height / line spacing) * width / speed. Tighter spacing = more detail but longer time.

  • Time = (H / interval) * W / speed
  • 200x200mm at 300mm/s, 0.1mm interval: 22 min
  • Wider interval = faster but coarser
  • DPI = 25.4 / interval_mm
Q

Can I cut metal with a diode or CO2 laser?

CO2 lasers cannot cut metals. Diode lasers can only mark anodized aluminum and stainless steel (not cut through). Metal cutting requires fiber lasers (1000W+) or plasma cutters.

  • CO2: cannot cut or mark bare metal
  • Diode: can mark stainless and anodized aluminum
  • Fiber laser: cuts metal (1000W+)
  • For metal: consider CNC milling or plasma

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This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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