How do I find my electricity rate per kWh?

Your electricity rate is listed on your utility bill, typically called 'energy charge' or 'rate per kWh.' If you can't find it, contact your utility company or check their website. Most US households pay between $0.08 and $0.20 per kWh, with the national average around $0.13 per kWh.

Where can I find my appliance's wattage rating?

Check the appliance's nameplate, user manual, or manufacturer's website. Most appliances have a label showing wattage or amps (multiply amps by 120V for watts). Common ratings: refrigerators 150-200W, microwaves 1000-1200W, laptops 50W, desktop computers 200-300W.

Why is my calculated cost different from my actual bill?

Several factors can cause differences: additional fees (distribution, customer charges, taxes), seasonal variations, rate tiers based on usage amounts, standby power consumption not included in calculations, and the fact that most utilities bill in 30-day periods rather than exact calendar months.

Can this calculator handle three-phase appliances?

The calculator works with single-phase residential appliances (standard household voltage). For three-phase commercial or industrial equipment, you'll need specialized electrical calculations that account for power factor and three-phase power formulas. Consider consulting an electrician for accurate commercial equipment calculations.

How accurate are the pre-loaded appliance wattages?

Pre-loaded wattages represent typical values for standard models. Actual consumption varies by brand, age, efficiency rating, and usage patterns. For the most accurate results, use your specific appliance's actual wattage rating or measure consumption with aKill A Watt meter.

What's the difference between watts and kilowatt-hours?

Watts measure power consumption rate (how much energy an appliance uses), while kilowatt-hours measure total energy consumed over time. Your electricity bill charges per kWh. To convert watts to kWh: (Watts × Hours) ÷ 1000. For example, a 1000W appliance running for 1 hour uses 1 kWh.

Electricity Cost Calculator

Calculate appliance electricity costs and monthly bills based on wattage, usage hours, and electricity rates with detailed cost breakdowns. Perfect for energy budgeting and appliance comparison with precise consumption analysis.

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Common Appliance Costs

Quick estimates for popular household appliances

Appliance Details

Enter your appliance's power consumption and usage patterns.

Power Consumption (Watts)

Check your appliance's manual or label for wattage rating

Hours of Use per Day

Days of Use per Month

Cost per kWh ($)

Check your electricity bill for your rate

How it works: Enter your appliance's wattage, daily usage hours, and electricity rate. The calculator computes monthly and annual energy costs using the formula: Cost = (Watts × Hours × Days) ÷ 1000 × Rate per kWh.

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