This simple calculator should give you a rough idea whether your household consumer unit (fuse box) would be able to cope with the installation of an EV charger. Most households have a 60 Amp consumer unit, with 100 Amp units being more commonly installed these days.
Please note that this should be a rough guide as different electrical appliances will have differing power requirements. As an indicator though, if the appliance creates heat (oven, clothes iron, fan heater) it will most probably use more watts of power.