Enter 2 values to get the other values and press the Calculate button:
Wattage Calculator – Estimate Electrical Power Usage Easily
The Wattage Calculator helps you quickly calculate the electrical power used by any device or circuit. Just enter voltage and current, and get the wattage instantly — perfect for managing home appliances, electronics, or DIY projects.
How to Use the Wattage Calculator
Enter:
- Voltage (V) in volts
- Current (I) in amperes
The calculator will show the power usage in watts (W).
Wattage Formula
Wattage (Power) = Voltage × Current
P (Watts) = V (Volts) × I (Amps)
Example
Voltage = 120 Volts
Current = 2 Amps
Wattage = 120 × 2 = 240 Watts
Common Use Cases
- Checking appliance power consumption
- Planning home electrical loads
- Solar power system calculations
- DIY electronics and repair
- Teaching basic electrical concepts
Why Use a Wattage Calculator?
This tool helps you avoid overloading circuits and manage energy consumption efficiently, saving money and ensuring electrical safety.
Frequently Asked Questions (FAQs)
What is wattage?
Wattage measures the electrical power a device uses when operating.
How can I reduce wattage?
Use energy-efficient devices and unplug appliances when not in use.
What if I only know amps?
You’ll need voltage too — use the formula: Watts = Volts × Amps.
Does this work for AC and DC?
Yes — for basic single-phase AC or DC circuits. For complex loads, consult an electrician.
Why do I need this?
It helps plan safe electrical setups and track energy use for budgeting.
Related tools: Voltage Calculator, Wire Calculator.