volts to watts converter
Volts to Watts Converter (V → W Calculator)
Quick Answer
Watts (W) = Volts (V) × Amps (A)
A Volts to Watts Converter (also called a V to W calculator, volt-to-watt tool, or voltage-to-wattage calculator) helps you instantly find out how much electrical power a device uses based on its voltage and current.
This is important for appliances, solar systems, batteries, inverters, generators, and car electronics—anywhere power usage matters.
Why Use a Volts to Watts Converter?
People often know a device’s voltage but not the wattage. This converter helps you:
- Calculate actual power consumption of appliances.
- Compare devices running on 110V, 120V, 220V, 230V, 240V power.
- Size solar inverters, battery setups, and power supplies correctly.
- Estimate load for breakers, circuits, and extension cords.
- Check compatibility for home, automotive, or generator-based systems.
No matter if you search “volts to watts calculator,” “v to w tool,” or “voltage to watt converter,” the formula is the same:
Watts = Volts × Amps
Formula: How to Convert Volts to Watts
Standard Formula
W = V × A
Where:
- W = Watts
- V = Volts
- A = Amps
AC Circuits (with Power Factor PF)
For AC loads:
W = V × A × PF
PF (Power Factor) usually ranges from 0.7 to 1.0 depending on the device.
Using Resistance (Ohm’s Law)
If you know resistance:
W = V² ÷ R
Where R is resistance in ohms (Ω).
Volts → Watts Conversion Table
Below is a quick reference for common voltages and currents:
| Voltage | Current (A) | Watts (W) |
|---|---|---|
| 1V | 1A | 1W |
| 1V | 2A | 2W |
| 1V | 3A | 3W |
| 2V | 2A | 4W |
| 3V | 3A | 9W |
| 5V | 4A | 20W |
| 12V | 5A | 60W |
| 24V | 4A | 96W |
| 48V | 3A | 144W |
| 120V | 2A | 240W |
| 120V | 4A | 480W |
| 220V | 2A | 440W |
| 230V | 3A | 690W |
| 240V | 4A | 960W |
Use this table to quickly estimate real-world wattage for home devices, solar setups, or automotive systems.
How to Use a V → W Converter
- Enter the voltage (e.g., 12V, 120V, 240V).
- Enter the current (amps).
- The tool instantly calculates the wattage.
Examples
- 120V × 2A = 240W
- 240V × 4A = 960W
- 12V × 10A = 120W
- 220V × 3A = 660W (PF = 1)
Real-World Applications
Home Appliances
- A 120V device at 4A = 480W
- A 240V appliance at 3A = 720W
Solar Power
- 24V battery at 20A = 480W
- 48V inverter input at 15A = 720W
Automotive
- 12V car system at 50A = 600W
Generators
- 220V output at 5A = 1100W
FAQs
Is a Volts to Watts Calculator the same as a V to W Converter?
Yes — they are simply different names for the same tool.
Can I convert volts to watts without amps?
Not directly. You need current (A), unless you know resistance (R):
W = V² ÷ R
What is 120V in watts?
Depends on current.
Example: 120V × 2A = 240W
What is 220V in watts?
Example: 220V × 2A = 440W
How many watts is a 12V battery?
A 12V 100Ah battery can deliver:
12V × 100A = 1200W (for 1 hour)
Is 220V more powerful than 120V?
Not by itself. Power depends on both volts and amps.
Final Thoughts
Whether you call it a volts to watts converter, v to w calculator, or voltage-to-watt tool, the principle never changes:
Watts = Volts × Amps
This simple calculation helps you:
- Understand power usage
- Avoid overloads
- Size solar systems correctly
- Match appliances to the right voltage
- Improve electrical safety
Whenever you need to know how many watts your device really uses, this converter gives you the answer instantly.