Electricity Bill Calculator

Electricity Bill Calculator multiplies kilowatt-hours by a flat rate and adds a fixed fee. It does not look up a utility, a tier, or a tax.

kWh times the rate, then the fee

The fields are kWh used, Rate per kWh, and Fixed fee. The form opens on 350, 0.15, and 10. Energy is usage times rate. The total is that energy plus the fee. 350 times 0.15 is 52.5, and 52.5 plus 10 is 62.5. The lines read Energy charge: 52.5 and Total with fixed fee: 62.5. The button says Calculate Electricity Bill. A US locale leaves those two numbers without a thousands separator. Last checked: October 2026, against electricityBill. Zero usage with the same rate and fee is an energy charge of 0 and a total of 10, because only the fee remains.

What the total leaves out

There is no second rate, no time-of-day band, and no tax percent. A bill that jumps after a usage threshold will not match this product. Type the single rate your note gives you. A negative usage or a negative rate stops with Usage and rate cannot be negative. A negative fee is not blocked by that check, so a credit would lower the total. Do not type a fee you have not confirmed. Those result lines do not print a currency symbol. 350 and 0.15 are only the sample. They are not a national tariff. A blank field throws Enter a valid number before any line is drawn. Fee 5 on a 20 energy charge totals 25.

A second pair to check the arithmetic

100 kWh at 0.20 with a fee of 0 is an energy charge of 20 and a total of 20. 100 kWh at 0.20 with a fee of 5 is 20 and 25. If the default 350 does not show 52.5 and 62.5, the fields are not 350, 0.15, and 10. The rate field accepts a step of 0.001, so 0.155 is a legal rate. 350 times 0.155 is 54.25, plus a fee of 10 is 64.25. The same two-decimal formatting applies.

Not a statement from the utility

Use the total to compare a flat rate you already have. Do not send it as the amount due. Fuel Cost Calculator answers a trip, not a power bill. The three numbers stay in this browser. 500 kWh at 0.12 with a fee of 15 is an energy charge of 60 and a total of 75. 1 kWh at 0.15 with a fee of 0 is 0.15 and 0.15. If those products do not match the lines, the fields are not the numbers you think you typed. The rate is a flat price per kilowatt-hour, not a daily standing charge split across the month unless you already folded that charge into the fee.