EV Charging Calculators
Everything you need to plan, price and time a charge — at home, at work, or on the road. 9 free calculators, all in your browser.
Charging tools
EV Charging Cost Calculator
Work out exactly what it costs to charge your EV from any percentage to any other.
Open tool →EV Charging Time Calculator
See how long a charge will take, at home or on a public charger, for any battery and charger.
Open tool →EV Charging Speed Calculator
See how many miles of range a charger adds per hour — the most intuitive way to think about charging speed.
Open tool →DC Fast Charging Session Cost
See what a single DC fast-charge session costs, and how much extra you pay over home charging.
Open tool →Home Charger Amp & Breaker Calculator
Find the amp draw, breaker size and wire gauge needed to install a home Level 2 EV charger.
Open tool →kW ↔ Amps Converter
Convert between kilowatts and amps at any voltage — useful for sizing chargers, wires and breakers.
Open tool →EV Solar Panel Calculator
Find out how many solar panels it takes to cover a year of EV driving with sunshine.
Open tool →EV Time-of-Use Charging Savings
See how much an off-peak electricity plan saves over a flat rate when you charge mostly overnight.
Open tool →EV Daily Energy Need Calculator
See how much electricity your EV actually uses per day, week, month and year.
Open tool →The three speeds of EV charging
Every EV charger falls into one of three speed tiers. Level 1 is a standard 120 V wall outlet — it adds about 3–5 miles of range per hour, fine for overnight top-ups but too slow as anyone's only source. Level 2 (240 V, 3.3–19 kW) is the home-charger standard and adds 20–60 miles per hour depending on amperage. DC fast charging (50–350 kW) is the public-only kind that adds hundreds of miles per hour, designed for road trips.
Home charging is usually the cheapest
For most EV owners, 80–95% of charging happens at home overnight, and it's usually the cheapest electricity you can buy. Off-peak rates on time-of-use plans can drop as low as $0.05/kWh in many regions. A Level 2 charger installed in your garage typically pays for itself within a year or two of avoided public-charging premiums.
DC fast charging — fast, expensive, occasional
Public DC fast chargers (Tesla Supercharger, Electrify America, EVgo, ChargePoint) typically charge $0.40–0.60 per kWh — roughly 3–4× what you pay at home. They're worth it for the time savings on road trips, but a daily DC-fast habit erodes most of an EV's running-cost advantage. The mix that works for almost everyone: home most days, public fast on trips.
Planning a home charger install
The biggest decision is amperage. Most home Level 2 chargers are sized at 32 A on a 40 A circuit (about 7.4 kW), which fully refills a modern EV overnight. Tesla Wall Connectors and similar premium units go up to 48 A on a 60 A circuit (about 11.5 kW) for faster charging. Use the Home Charger Amp Calculator to size your circuit and wire gauge, and always have the actual installation done (or at least inspected) by a licensed electrician — this is dedicated, continuous-load wiring that must meet local code.