How much electricity am I being charged?

[GodAtum]

I'm trying to work out the cost of running my PC but I'm getting different prices per https://www.sust-it.net/energy-calculator.php

When I put in 230W for 1 hour I get £0.06. When I put in 2.7 kWh for 1 hour I get £0.66. (both measured using my Tapo plug).

So which one is right?

 

[GodAtum]

So according to my plug, I've used 2.7 kWH over 11 hours = £7.28

But 230w for 11 hours = £0.62

 

[GodAtum]

Thanks, that makes sense. BTW, does anyone have Tapo plugs they extract the data from and put it into something like Grafana?