Watts to Joules
Energy converter

Electricity Cost Calculator

Calculate the daily, monthly, and yearly cost of running any electrical appliance.

W
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How Electricity Cost works

Understanding how much it costs to run an appliance is essential for reducing your electricity bill.

To calculate the cost, you first need to convert the wattage into kilowatt-hours (kWh) by multiplying by the hours used and dividing by 1000. Then, simply multiply by your local electricity rate.

Formula
1Cost = (Watts × Hours ÷ 1000) × Rate

Where Rate is the price per kWh (e.g., $0.16).

Electricity Cost conversion table

Reference Table4 rows
Monthly cost to run common appliances (at $0.16/kWh).
Appliance↕Average Power↕Hours/Day↕Monthly Cost↕
LED Bulb
10 W
5 h
$0.24
Refrigerator
150 W
8 h
$0.58
Desktop PC
400 W
6 h
$1.15
Space Heater
1500 W
4 h
$2.88
💡 Click any row to auto-fill the calculator aboveClick column headers to sort

FAQ: Electricity Cost

How much does it cost to run a 1500W heater for 24 hours?

At $0.16 per kWh, running a 1500W heater for 24 hours costs $5.76 per day.

What is the average cost of electricity per kWh?

The national average in the US is around 16 cents ($0.16) per kilowatt-hour, though it varies significantly by state.

Tools related to Electricity Cost

Watts to Joules ConverterThe full power × time energy calculator with three modes.kWh to JoulesTurn the kWh figure on your electricity bill into joules — 1 kWh = 3,600,000 J.Joules to kWhConvert a joule or megajoule figure into billable kilowatt-hours — divide by 3,600,000.Watts to AmpsCalculate amps from watts and volts for DC and AC circuits — I = P ÷ V.Joules to CaloriesConvert joules into calories and food Calories (kcal) — 1 cal = 4.184 J.Watts to VoltsCalculate volts from watts and amps for DC and AC circuits — V = P ÷ I.Amps to WattsCalculate watts from amps and volts for DC and AC circuits — P = V × I.Watts to OhmsCalculate ohms from watts and volts or amps — R = V² ÷ P.Joules to WhConvert joules into watt-hours — divide by 3,600.Joules to eVConvert joules into electronvolts — 1 eV = 1.602×10⁻¹⁹ J.Joules to BTUConvert joules into BTUs — 1 BTU ≈ 1,055 Joules.Joules to WattsCalculate watts from joules and time — W = J ÷ seconds.Watts to AhConvert watts into battery amp-hours — Ah = (W × Hours) ÷ V.Ah to WattsConvert battery amp-hours into sustained watts — W = (Ah × V) ÷ Hours.Watts to HPConvert watts into mechanical horsepower — 1 HP ≈ 745.7 Watts.HP to WattsConvert mechanical horsepower into watts — W = HP × 745.7.