【How-to】How far will a 1mw laser go

So 1,000MW/h (or one gigawatt hour expressed as 1GW/h) is equivalent to 0.8604207kton, or 860.4207 tons of explosive. However, it’s unlikely one would be able to fire a laser at the same target for more than a few seconds, so let’s convert it down to 1,000 Megawatt Seconds or one Gigawatt Second (1GW/s).