Calculation playbook
Energy Cost Glossary
Watts, kilowatts, kWh and appliance running cost terms.
Quick definitions
Use this page as a plain-language reference while using the related tools. The goal is not to replace specialist advice; it is to make common calculation terms easier to recognize.
Why the terms matter
Most mistakes happen when two similar words are treated as the same thing. A rate is not the same as a total, a monthly number is not the same as a yearly number, and an estimate is not a guarantee. The linked tools show the formula so you can see which number is being used where.
Good checking habit
Change one input at a time, recalculate, and compare the result. That makes the most sensitive part of the calculation obvious.
Related tools
Mortgage Payment CalculatorEstimate monthly principal and interest, then add property tax and insurance to see a fuller monthly housing number.Rent vs Buy Monthly Cost CalculatorCompare a simple monthly rent number with a simplified monthly ownership cost before making a bigger spreadsheet.Electricity Cost CalculatorTurn watts, hours and your electricity rate into an estimated running cost for a device.Appliance Running Cost CalculatorEstimate the daily, monthly and yearly cost of an appliance that runs for part of each day.Paint Needed CalculatorEstimate wall paint from room dimensions, coats and paint coverage.Download Time CalculatorEstimate how long a file will take to download from file size and internet speed.