Volts to Watts Calculator – CheckBillOnline.com
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Volts to Watts Calculator
This tool is designed to help you convert voltage (volts) into power (watts) in just a few simple steps.
Input
Output
Power result in kilowatts:
How to Use the Volts to Watts Calculator
The Volts to Watts Calculator on CheckBillOnline.com makes it incredibly easy to convert electrical voltage and current into power in watts or kilowatts. Whether you are an electrician, a student, a homeowner trying to understand your electricity bill, or simply someone curious about electronics, this tool is built for you. Follow these simple steps to get your power result instantly:
Step 1 – Select Current Type: Choose from DC (Direct Current), AC Single Phase, AC Three Phase Line-to-Line, or AC Three Phase Line-to-Neutral. Most household devices use AC, while batteries and solar panels use DC.
Step 2 – Enter Power Factor (AC only): If you selected an AC current type, you'll see a Power Factor field. Enter a value between 0 and 1. A typical household power factor is around 0.8. For DC calculations, this field is hidden.
Step 3 – Enter Voltage in Volts: Type the voltage value of your circuit or device. Common values are 5V, 12V, 24V, 110V, 120V, 220V, 230V, or 240V depending on your region and device type.
Step 4 – Enter Current in Amps: Input the current (amperage) that flows through your circuit. This is usually found on your device's label or in the product specifications.
Step 5 – Click Calculate: Press the green Calculate button. Your result will appear in the Output section showing power in both Watts (W) and Kilowatts (kW). Use the Reset button to clear all fields and start a new calculation.
Calculation Formulas
DC Volts to Watts Formula
P(W) = V(V) × I(A)
Where P = power in watts, V = voltage in volts, I = current in amps.
Example: DC circuit, 12V, 2A → P = 12 × 2 = 24 W
AC Single Phase Volts to Watts Formula
P(W) = PF × I(A) × V(V)
Where PF = power factor (0 to 1), I = phase current in amps, V = RMS voltage in volts.
Example: 120V, 5A, PF 0.8 → P = 0.8 × 5 × 120 = 480 W
AC Three Phase – Line to Line
P(W) = √3 × PF × I(A) × VL-L(V)
Example: 208V, 10A, PF 0.85 → P = √3 × 0.85 × 10 × 208 ≈ 3062.2 W
AC Three Phase – Line to Neutral
P(W) = 3 × PF × I(A) × VL-N(V)
Example: 120V (L-N), 10A, PF 0.85 → P = 3 × 0.85 × 10 × 120 = 3060 W
Volts to Watts Conversion Charts (DC)
5 Volts to Watts
12 Volts to Watts
24 Volts to Watts
48 Volts to Watts
110 Volts to Watts
120 Volts to Watts
220 Volts to Watts
230 Volts to Watts
240 Volts to Watts
Frequently Asked Questions (FAQs)
What is the difference between Volts and Watts? ▼
Volts (V) measure electrical potential or pressure — the force that pushes electricity through a circuit. Watts (W) measure power — the actual rate at which energy is used or produced. To get watts, you also need to know the current (amps) flowing through the circuit. Simply put: Volts × Amps = Watts (for DC circuits).
How do I convert volts to watts without amps? ▼
You cannot convert volts to watts without knowing the current (amps). Power (watts) is the product of voltage and current. If you only have volts and resistance (ohms), you can use Ohm's Law: I = V / R to find amps first, then calculate watts.
What is power factor and why does it matter for AC? ▼
Power factor (PF) is a number between 0 and 1 that represents how efficiently electrical power is being used in an AC circuit. A PF of 1.0 means 100% efficiency (purely resistive loads like heaters). Motors and other inductive loads typically have PF values of 0.7–0.9. Ignoring PF in AC calculations leads to incorrect watt values.
How many watts is 220V at 5A? ▼
For a DC circuit: 220V × 5A = 1100W. For an AC Single Phase circuit with a power factor of 0.8: 220V × 5A × 0.8 = 880W. The result depends on the current type and power factor.
What is 1 kilowatt in watts? ▼
1 kilowatt (kW) equals 1,000 watts (W). Our calculator displays results in both watts and kilowatts so you can easily see both values at once.
Can I use this calculator for solar panels? ▼
Yes! Solar panels produce DC power. Select "DC" as the current type, enter the panel voltage (e.g. 18V, 24V, 48V) and the short-circuit or operating current in amps. The result gives you the panel's power output in watts.
Is 220V the same in all countries? ▼
Not exactly. Pakistan and many countries in Asia, Europe, and Africa use 220–230V at 50 Hz. The USA and Canada use 110–120V at 60 Hz. Always check your local grid voltage when making calculations for appliances.
How do I find the watts of a household appliance? ▼
Check the label or sticker on the appliance — it usually lists voltage (V) and current (A) or directly states watts (W). If only voltage and amperage are listed, use this calculator to find watts. This is helpful when calculating your electricity bill.
About The Author
CB
CheckBillOnline.com Team
Electricity & Utility Experts
The team at CheckBillOnline.com is dedicated to making electricity calculations, bill checking, and utility conversions simple and accessible for everyone — from homeowners in Pakistan to engineers worldwide. We build free, accurate, and easy-to-use online tools to help you understand and manage your energy consumption better. All our calculators are carefully developed and verified against established electrical engineering formulas.
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