kW, kWh and range: the EV numbers explained

Use a simple energy example

If a hypothetical vehicle has 60 kWh available for a journey and uses 15 kWh for each 100 km, the arithmetic gives 400 km. At 20 kWh per 100 km, the same energy gives 300 km. This simplified exercise ignores reserves and changing conditions and is not a claim about a named car.

When reading specifications, label the battery figure exactly as the source does. Do not silently substitute total pack capacity for a stated usable amount, or a laboratory range for an owner measurement. Keep units and the measurement basis together.

Power is a rate

Adding 30 kWh at a constant 60 kW would take half an hour in an ideal calculation. Real charging is not necessarily constant. The Department of Energy identifies vehicle and charging equipment characteristics among the factors affecting charging time. A station’s advertised power is therefore insufficient to predict an entire stop.

Treat range as a scenario

The US Energy Information Administration describes how factors including outside temperature can affect electric-vehicle efficiency and range. That is one reason to keep a published range figure tied to its stated conditions.

Read a range comparison carefully

For two vehicles, collect the range procedure, battery version, consumption units and the charging interval used in any quoted time. Compare like with like. If one missing detail changes the interpretation, mark it as a question to resolve rather than estimating an exact advantage.