Static EV calculator

EV Charging Estimator

Estimate charging time, kWh added, battery percentage gained, miles added, and session cost using one lightweight static app.

Calculator

Charging session inputs

Adjust assumptions and the estimator updates every result target below.

Calculator mode Vehicle preset Battery size (kWh) Efficiency (kWh / 100 miles) Charger preset Manual charger override (kW) Current battery (%) Target battery (%) Charging duration (hours) Electricity cost ($ / kWh)

Advanced assumptions

Charging efficiency (%) DC taper factor (%) Usable battery (%) Winter / efficiency reduction (%) Reserve buffer (%)

Results

Session estimate

kWh added

0.0

Energy estimated from charger power and charging losses.

Battery % added

0.0%

Uses the selected usable battery capacity assumption.

Miles added

0.0 mi

Converted from energy and adjusted efficiency.

Time estimate

0h 0m

For target mode this is the estimated session duration.

Cost estimate

$0.00

Energy delivered multiplied by your electricity rate.

Ending battery %

0.0%

Capped by usable battery and reserve assumptions.

Compare chargers

Preset comparison table

Uses the selected duration and current vehicle assumptions.

Charger	Power	kWh	Battery %	Miles	Cost

Visualize

Estimated battery percentage over time

Illustrative only. DC fast charging especially will taper and vary in real conditions.

Formulas

How the estimates work

Energy and battery gain

kWh added = charger kW × hours × charging efficiency

Battery % added = kWh added ÷ battery size × 100

Range and cost

Miles per kWh = 100 ÷ kWh per 100 miles

Miles added = kWh added × miles per kWh

Charging cost = kWh added × electricity cost per kWh

Target charge time

kWh needed = battery size × ((target % - current %) ÷ 100)

Hours needed = kWh needed ÷ (charger kW × charging efficiency)

Assumptions

Important charging disclaimer

Real charging speed varies by temperature, battery state of charge, vehicle limits, charger limits, usable battery constraints, and DC fast charging taper. This estimator is intended for planning, not as a guarantee of actual charging performance.