How do I estimate EV charging time?

Calculate the energy needed from the battery capacity and state-of-charge change, then divide by effective charger power. DC fast charging can slow after a high state of charge.

Why is outlet energy higher than energy added to the battery?

Charging has losses in the charger, battery conditioning and vehicle electronics. Efficiency accounts for that difference.

Does this use live charging station prices?

No. Enter your own electricity price per kWh from a utility bill, home rate plan or charging-network price.

EV Charging Calculator

Estimate electric vehicle charging time, energy from the outlet, charging cost, added range and cost per 100 miles.

Battery capacity (kWh)

Charger power (kW)

Start SoC (%)

Target SoC (%)

Charging efficiency (%)

Electricity price ($/kWh)

Consumption (kWh/100 mi)

Estimate EV charge time and cost

English EV charging searches usually expect charge time, kWh and cost in one place. The calculator uses battery capacity, start and target state of charge, charger power, charging efficiency and electricity price per kWh.

Enter battery capacity in kWh.
Set charger power, start charge and target charge.
Add charging efficiency and your electricity price per kWh.
Use vehicle consumption to estimate added range and cost per 100 miles.

Planning estimate

Real charging speed depends on the vehicle, battery temperature, charger limits, state of charge, taper curve, site conditions and billing rules.

EV charging formulas

E n er g y a dd e d = B a tt er y c a p a c i t y \times \frac{T a r g e t S o C - S t a r t S o C}{100}

O u tl e t e n er g y = \frac{E n er g y a dd e d}{C ha r g in g e f f i c i e n cy}

C os t = O u tl e t e n er g y \times P r i ce p er k W h

A dd e d r an g e = \frac{E n er g y a dd e d}{k W h /100 mi} \times 100

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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