Energy costs,
made simple. Instantly.

Multiply the energy you add (battery kWh × the percent you charge, plus about 10% charging loss) by your electricity rate. At the U.S. average near 16.5¢/kWh, a typical top-up runs a few dollars. The charging-cost calculator does it from your battery size and rate.

Often, but not always. EVs usually win on fuel and maintenance but can cost more up front. The break-even depends on your miles, local electricity vs gas prices, and how long you keep the car — the EV-vs-gas calculator finds it for your situation.

Size by heating and cooling load, not just square footage — climate, insulation, and air-sealing all matter. A rough rule is 20–30 BTU per square foot, but the sizing calculator adjusts for climate and insulation, and a Manual J load calc from a pro is the gold standard.

Divide the installed cost by the yearly value of the electricity the system offsets (its annual output times your rate). Most systems land somewhere in the high single digits to mid-teens of years, depending on your sun, rate, and cost — the solar payback calculator works it out for your numbers.