Wattage Calculator

Enter 2 values to get the other values and press the Calculate button:

Wattage Calculator – Estimate Electrical Power Usage Easily

The Wattage Calculator from CalculatorSee helps you determine the power consumption of your devices. Whether you're calculating your monthly electricity bill or planning an energy-efficient setup, this tool is perfect for estimating wattage, voltage, current, or resistance.

What is a Wattage Calculator?

A Wattage Calculator estimates how much power an electrical device consumes based on one or more of the following inputs: voltage (V), current (A), and resistance (Ω). It also helps convert between watts, kilowatts, and kWh for accurate billing.

How to Use the Wattage Calculator

  1. Enter the Voltage (V) of the device.
  2. Input the Current (A) in amperes.
  3. Click Calculate to get the wattage.
  4. Optionally, convert watts to kilowatts or calculate energy cost.

Formula Used in Wattage Calculator

  • Watts (W) = Voltage (V) × Current (A)
  • kWh = (Watts × Hours Used) ÷ 1000
  • Cost = kWh × Electricity Rate ($/kWh)

Example Calculation

If a device operates at 220V and draws 1.5A:

W = 220 × 1.5 = 330 Watts

If used for 4 hours/day:

Energy = 330 × 4 ÷ 1000 = 1.32 kWh

If electricity cost is $0.12/kWh:

Daily Cost = 1.32 × 0.12 = $0.158

Benefits of Using the Wattage Calculator

  • Estimate power consumption instantly
  • Plan your energy budget
  • Support eco-friendly and cost-saving strategies
  • Helps in UPS/generator capacity planning

Common Appliance Wattage Examples

  • LED bulb: 10W
  • Microwave oven: 1000W
  • Refrigerator: 150–400W
  • Washing machine: 500–2000W
  • Desktop computer: 200–600W

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Frequently Asked Questions (FAQs)

1. What is wattage?

Wattage refers to the rate at which electrical energy is consumed or produced, measured in watts (W).

2. How do I convert watts to kilowatts?

Divide the number of watts by 1,000. For example, 1000W = 1kW.

3. Can I calculate wattage without amps?

You need either the current (amps) and voltage, or the resistance and voltage, to calculate wattage accurately.

4. Why is my electricity bill so high?

High wattage devices used for long periods can significantly raise your monthly energy bill. Use the calculator to identify power-hungry devices.

5. Does this calculator work for both AC and DC devices?

Yes, but for AC with varying power factors, results may be approximate unless power factor is considered.