EV Charging Speed Calculator

EV charging speed

EV efficiency

kWh/100km

Battery size

kWh

Charging power

Charger type

⚡AC wall charger

Charging speed ~44 km/hr

10–80% charge time 10 hr 70.0 kWh needed

Rate comparison

Typical EV charging speed in Australia

The table below shows estimated range added per hour for each charger type, with visual bars for easy comparison.

How this calculator works

This calculator estimates how much range a charger adds to your EV per hour based on the charger power and your vehicle's efficiency. Each card also shows the estimated time to charge from 10% to 80%, giving you a practical sense of how long each charger type takes.

If your vehicle has a maximum DC charging speed, chargers above that limit will show the effective speed your vehicle can actually achieve, with a warning indicating the vehicle limit.

Formulas

Charging speed (km/hr) = Charging power (kW) ÷ EV efficiency (kWh per 100 km) × 100

10–80% charge time = Battery size × 0.7 ÷ Charging power

Worked example

Charging power: 7 kW (AC wall charger)
EV efficiency: 16 kWh per 100 km
Battery size: 75 kWh

Charging speed: 7 ÷ 16 × 100 = ~44 km per hour

10–80% charge time: 75 × 0.7 ÷ 7 = 7 hr 30 min

Real-world note

This calculator assumes a constant charging rate. In practice, DC fast charging speed varies across the charging session — it is fastest at lower battery levels and slows as the battery fills. The range-per-hour figures shown are ideal maximums for each charger type. Actual speeds depend on the vehicle's charging curve, battery temperature and charger availability.

Frequently asked questions

How fast does a home charger add range?

A standard 7 kW AC wall charger adds around 44 km of range per hour for a typical EV with 16 kWh per 100 km efficiency. A portable 2.3 kW charger adds around 14 km per hour. Most EV owners with a wall charger plug in overnight and start each day with a full battery, so the slower speed is rarely an issue in practice.

Why does EV charging slow down when the battery gets fuller?

EV batteries usually charge fastest when they are at a lower or mid state of charge, then slow down as they approach full. This slowdown helps manage heat and protect the battery. As a result, the final portion of a charge, such as going from 80% to 100%, usually takes much longer than the earlier part of the charging session.

What is battery preconditioning?

Battery preconditioning is when an EV warms or cools the battery before charging or driving so it reaches an optimal operating temperature. This helps improve charging performance and efficiency, especially before high power DC fast charging. Many EVs automatically precondition the battery when navigating to a fast charger.