Control your electricity bill

Energy Consumption Calculator

Q: How to find the correct appliance power?

Check the efficiency label or equipment manual; power indicated in kW should be multiplied by 1000 to get watts.

Q: Which rate to use in the calculation?

Use the final per kWh value from the electricity bill, including taxes and flags; divide total paid by kWh consumption to get average rate.

Q: How to reduce consumption?

Unplug when not using, choose A-rated appliances and concentrate intensive use outside peak hours on time-of-use rates.

Q: Can I estimate environmental impact?

The calculator uses an average factor of 0.084 kg CO₂ per kWh to estimate emissions; value may vary according to local energy matrix.

Q: How to analyze the annual bill with the result?

Multiply monthly cost by months of use and adjust for seasonal variations like increased air conditioning in summer.

Discover how much each electrical appliance consumes per day, month and year, estimate costs in your currency and identify opportunities to save energy.

Usage examples

• Calculate monthly cost of appliances like air conditioning or electric shower.
• Plan the impact of a new appliance on your electricity bill.
• Compare models with different power ratings before purchase.

Related tools

Also check out the Fuel Consumption Calculator to estimate trips and the Equivalent Rate Converter when evaluating financing for more efficient equipment.

Potência do aparelho (W)*

Horas de uso por dia*

Dias de uso no mês*

Tarifa de energia (R$/kWh)*

Utilize a tarifa média da sua conta de luz (incluindo impostos) para um resultado mais fiel.

Resultado

Consumo diário4,80 kWh

Consumo mensal144,00 kWh

Gasto mensal estimadoR$ 136,80

Consumo anual1.728,00 kWh

Gasto anual estimadoR$ 1.641,60

Custo diário aproximado

R$ 4,56

Custo por hora de uso

R$ 1,14

Emissão mensal estimada

12,10 kg CO₂

How to calculate kWh

Each appliance consumes energy in watts (W). To convert to kilowatt-hours (kWh), multiply power by hours of use and divide by 1000. The electricity bill is based on this unit, so the result is multiplied by the energy rate to estimate cost.

Consumption (kWh) = Power (W) × Hours / 1000

Cost ($) = Consumption (kWh) × Rate

Remember to consider seasonal variations: air conditioning, heaters and fans have different uses between summer and winter. Adjust usage days for each scenario before planning the annual bill.

Consumption reference by equipment

Appliance	Typical power	Daily use	Estimated monthly consumption
12k BTU split air conditioner	1200 W	6 h	≈ 216 kWh
5500 W electric shower	5500 W	15 min	≈ 41 kWh
Frost-free refrigerator	150 W	24 h	≈ 108 kWh

*Approximate values. Check the Energy label for specific data on your model.

Strategies to save

Replace fluorescent bulbs with LED, which consume up to 80% less energy.
Schedule automatic shutdown of standby appliances.
Perform periodic maintenance on climate equipment to maintain efficiency.
Invest in smart plugs to monitor individual consumption of each appliance.

Frequently asked questions

Understand key points before building your savings plan.

How to find the correct appliance power?+

Check the energy efficiency label, manufacturer's manual or nameplate on the back of the equipment. Power is usually in watts (W) or kilowatts (kW). If in kW, multiply by 1000 to convert to watts.

Which rate to use in the calculation?+

Use the final amount charged per kWh on your electricity bill, including taxes, tariff flags and charges. Divide the total paid by kWh consumption to get the average rate.

How to reduce consumption?+

Unplug appliances when not in use. Prefer appliances with A energy rating. Schedule use of high-consumption equipment during off-peak hours if your rate allows.

Can I estimate environmental impact?+

Yes. The calculator estimates average CO₂ emissions using a factor of 0.084 kg per kWh, approximate value for the grid. Numbers vary according to your region's energy matrix.

How to analyze the annual bill with the result?+

Multiply the estimated monthly cost by the number of months the appliance is used. Adjust the simulation with seasonal variations, such as increased air conditioning use in summer.