Home Calculators
Home
A rough electric bill by state, what an appliance costs to run, or bags of concrete for a slab.
In this topic
Calculators
01How Much Is My Electric Bill by State?A monthly electric bill from your kWh and the EIA average for your state. You can type the rate from your bill instead.02How Much Does This Appliance Cost to Run?Estimate 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.03How Much Concrete Do I Need?Cubic yards and bag counts for a rectangular slab. Waste is listed separately.04How Many Square Feet Is This Space?Add 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 →