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A rough electric bill by state, what an appliance costs to run, or bags of concrete for a slab.
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Calculators
01Electricity Cost Calculator by StateA monthly electric bill from your kWh and the EIA average for your state. You can type the rate from your bill instead.02Appliance Electricity Cost CalculatorEstimate what a device costs to run from its wattage, hours of use, and the EIA average for your state. You can type the rate from your bill instead.03Concrete CalculatorCubic yards and bag counts for a rectangular slab. Waste is listed separately.04Square Footage CalculatorAdd rectangular rooms or spaces and get total area in square feet, with square meters from the shared conversion engine.
How these are built
Every calculator shows its work.
Each one names the formula it used, and the dated official source behind any figure it did not get from you.
How the numbers work →