Free Calculators

Electrical Load & EV Charging Calculators.

Free tools for panel capacity, breaker sizing, wire gauge, generator planning, and EV charger load assessment. Instant results, no sign-up.

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Frequently asked questions.

Everything you need to know about our calculators.

Are these calculators accurate?

Our calculators follow National Electrical Code (NEC) guidelines and industry-standard formulas. They provide accurate estimates, but always consult a licensed electrician before making installation decisions.

Do I need to create an account?

No. All calculators are free to use without sign-up. Results update instantly as you change inputs.

What is the 80% rule for breakers?

Per NEC, continuous loads (3+ hours) should not exceed 80% of a breaker's rating. For example, a 50A breaker should not carry more than 40A of continuous load. Our calculators apply this rule where applicable.

Can I share my calculation results?

Yes. Every calculator page has a Share button that copies the URL. You can send the link to share your exact inputs and results.

What voltage should I use?

Most US homes use 240V for large appliances and EV chargers, and 120V for standard outlets. EV Level 2 chargers operate at 240V. Use 240V unless you're calculating a Level 1 (trickle) charge.

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Your free hub for EV charging and electrical calculators.

Planning to install a home EV charger? Wondering if your electrical panel can handle the load? Need to estimate charging costs or find the right wire size? chargerload.com is your complete resource for electrical planning and EV charging calculations. We've built a comprehensive suite of free, instant calculators that help homeowners, electricians, and EV owners make informed decisions about their electrical infrastructure.

Our EV charger load calculator is the flagship tool that answers the most common question: "Can my panel support an EV charger?" Simply enter your panel size, existing household load, and charger amperage to get an instant assessment with a visual utilization gauge. You'll see whether installation is safe, marginal, or requires a service upgrade — all updating live as you adjust inputs. This ev charging load calculator doubles as a home ev charger load calculator and ev charger panel calculator, handling ev charger electrical load calculations per NEC guidelines. Whether you need an ev charger amp calculator, ev charger capacity calculator, or ev charger circuit load calculator, this level 2 charger load calculator and tesla charger load calculator supports every major EV brand.

Once you know your panel can handle the load, our EV charging cost calculator helps you budget for the ongoing expense. Compare home charging rates against public DC fast charging prices. See per-charge costs, monthly estimates, and annual projections based on your local electricity rate and battery size. This ev charging price calculator and electric vehicle charging cost calculator works as a home charging cost calculator and ev electricity cost calculator. Use our ev cost per charge calculator and tesla charging cost calculator for instant expense breakdowns.

The EV charging time calculator tells you exactly how long your vehicle needs to charge. Enter your battery capacity, current charge level, target percentage, and charger power to see the estimated duration. For example, a 75 kWh battery charging from 20% to 80% on a 7.6 kW Level 2 charger takes approximately 6 hours. This charging time calculator and electric vehicle charging time calculator serves as an ev charge duration calculator and charging speed calculator for Level 1, Level 2, and DC fast charging.

For installers and electricians, the wire size calculator ensures proper wire gauge selection. Input amperage, distance, and material (copper or aluminum) to get the recommended AWG with voltage drop estimates. This wire gauge calculator and awg calculator features a complete wire sizing calculator with reference tables. The breaker size calculator helps you select the correct circuit breaker — applying the NEC 125% rule for continuous loads automatically. This circuit breaker calculator and breaker sizing calculator ensures correct breaker amp calculator results. Our EV charger amperage calculator converts charger power from kilowatts to amps, working as an ev charger amp calculator and charging current calculator.

Homeowners planning broader electrical work will find the electrical load calculator and panel capacity calculator indispensable. This house load calculator and residential load calculator estimates total household electrical demand. Check appliances like HVAC, oven, dryer, water heater, and EV charger to estimate your total household demand in amps and kilowatts — and see a suggested panel size. The electrical panel capacity calculator doubles as a panel load calculator and electrical service calculator.

For backup power planning, our generator size calculator helps you choose the right generator based on the appliances you need to keep running during an outage, factoring in both running and surge wattage. This generator sizing calculator and whole house generator calculator works for standby generator calculator and portable generator calculator needs. The service upgrade calculator helps you determine whether a 100 amp to 200 amp upgrade or panel replacement is required — a critical electrical service upgrade calculator for EV charger installations and home renovations.

All calculators on chargerload.com are completely free — no account creation, no email sign-up, no hidden fees. Results update instantly as you change inputs. Every page includes a Share button that copies a URL with your exact inputs, making it easy to share calculations with an electrician or contractor. Each calculator is mobile-friendly and works on any device. From electrical load calculations and breaker sizing to wire gauge selection and generator sizing, chargerload.com covers every aspect of residential electrical planning. Whether you're a homeowner checking if you can add an EV charger, an electrician preparing for an installation, or a contractor estimating generator requirements, our free tools provide fast, accurate, NEC-compliant results.

Get started today and take the guesswork out of EV charging and electrical planning. No sign-up required — just visit any calculator, enter your values, and see instant results. Share your calculations with contractors, save money on electrical assessments, and make confident decisions about your home's electrical infrastructure with chargerload.com.

Disclaimer: Our calculators provide estimates based on standard electrical formulas and NEC guidelines. Always consult a licensed electrician before performing electrical work or making installation decisions.