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
Estimate the continuous amp draw and minimum breaker rating for a U.S. home Level 2 EV charger. A planning estimate only; wire sizing needs an electrician.
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 for a planning estimate of amps and minimum breaker rating (it does not size wire), 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.