The answer is less than you probably think. A lot of people want to know how much power a treadmill will use when they’re considering adding one to their home gym, because it’s a new cost that needs to be factored into the power bill.
But the truth is an electric treadmill isn’t a particularly power-hungry device, especially as many newer models are designed to be as energy efficient as possible. The actual cost will depend much more on how often you use it than how much power it uses to run, but ultimately it will be less than many other common appliances such as your washing machine, and you’re unlikely to notice a sudden jump in your bills. In any case, it’s a lot cheaper to run than a gym membership is over a few years.