Energy & Utilities calculators

Not under those assumptions. Many utilities charge tiered or time-of-use rates and add delivery fees and taxes. For an all-in rate, divide your whole bill by the kilowatt-hours you used

The energy used by a 1,000 watt device running for one hour. A 100 watt bulb left on for ten hours uses one

Devices left plugged in draw a few watts around the clock. Across a house of chargers, screens and set-top boxes that adds up, and it runs all 8,760 hours of the year

It depends on how the figure was measured, so check the source. The EV calculator lets you add a loss percentage. So the cost reflects what the wall supplies and not only what reaches the battery

Fuel consumed between two full-tank readings is the refill amount; distance traveled is the difference between their odometer readings. Miles since the first fill divided by the gallons added is your mileage for that tank. Average a few tanks

Ratings come from lab conditions of strong sun and cool panels. Real roofs face heat, dirt, shade, wiring losses and an angled sun, so a planning loss of around 14 percent is a common allowance

Runtime falls as the load rises and as the battery ages, cools or drains deeply. The calculator shows the best case at your chosen usable depth, so plan on somewhat less

One hour of sunlight at 1,000 watts per square meter, the standard test strength. A day with five peak sun hours delivers the same energy as five hours at that strength, even if daylight lasts much longer

Multiply its watts by the hours used, divide by 1,000 for kilowatt-hours and multiply by your price per kilowatt-hour

Usually per mile, especially at home overnight, though public fast charging can cost as much as gasoline

Commonly 6 to 12 years, depending on the system cost, incentives, local sunshine and your electricity price