Electricity Cost Calculatorv1.0.0

Enter each appliance or device you want to track along with its wattage rating and the number of hours it runs per day. The calculator multiplies each appliance's wattage by its daily usage hours and by the number of days in the billing period, then divides by 1,000 to convert watts to kilowatt-hours. That kWh figure is multiplied by your electricity rate to produce the estimated cost for each appliance and for all appliances combined.

• Click Add Appliance to create a new row. Enter the appliance name in the Appliance Name field, its power draw in the Wattage (W) field, and how long it runs each day in the Hours per Day field.
• Numeric fields accept decimals, fractions such as 3/4, and mixed numbers such as 1 1/2. Commas and dollar signs are stripped automatically.
• Open Settings to adjust the Electricity Rate (per kWh) to match your local utility rate. The default is 0.12. Change the Currency Symbol if you do not use dollars, and adjust Days per Month to match your billing cycle length.
• Click Calculate or wait for automatic recalculation after typing. The results section displays each appliance's monthly kWh consumption and cost, followed by totals for the month and the year.
• Enable Show step-by-step calculations in Settings to see the formula substitution for every appliance: wattage multiplied by hours per day multiplied by days per month divided by 1,000 equals kWh, then kWh multiplied by rate equals cost.
• Click Reset to clear all appliances and return every setting to its default value.

The core formula is: kWh per month = (Wattage x Hours per Day x Days per Month) / 1,000. Monthly cost = kWh per month x Rate per kWh. Yearly cost = Monthly cost x 12.

Tracking electricity consumption at the appliance level reveals which devices contribute most to utility bills and where changes in usage habits or equipment upgrades yield the largest savings.

• Household budgeting: List every major appliance in a home, from a 1,500 W space heater running 8 hours a day to a 60 W light bulb on for 12 hours, and compare their individual contributions to the monthly bill.
• Rental cost splitting: Tenants sharing a unit can enter their personal devices, such as a 200 W desktop computer used 10 hours a day, to estimate each person's fair share of the electricity bill.
• Appliance replacement decisions: Compare the annual operating cost of an older 800 W refrigerator running 24 hours against a newer 350 W model to quantify the payback period on the upgrade.
• Small business overhead: A shop owner can enter equipment like a 2,000 W commercial oven running 6 hours and a 150 W POS system running 14 hours to forecast monthly utility expenses for pricing decisions.
• Seasonal planning: Adjust hours per day for seasonal appliances, such as an air conditioner at 1,200 W for 10 hours in summer versus 0 hours in winter, to project costs across different months.
• Solar offset analysis: After calculating total monthly kWh, compare the figure against a solar panel system's expected output to determine what percentage of consumption the panels would cover.