Laser weapons are usually measured in watts or kilowatts, and the answer depends on the kind of laser. Small or prototype systems can be around 10 kW to 50 kW ; military-grade systems have also been reported around 30 kW, 50 kW, 60 kW, and above 100 kW in some demonstrations.

For very rough context:

  • 1 watt is tiny.
  • 1 kilowatt = 1,000 watts.
  • Tactical weapon lasers often sit in the tens of kilowatts.
  • Larger or experimental systems can reach hundreds of kilowatts or more.

If you mean a sci-fi “laser gun,” there’s no real standard, but online discussions often guess everything from a few hundred watts for a handheld version to much higher outputs for ship-mounted weapons.