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Easily convert power to voltage with our online Power to Voltage Calculator. Get instant results with formula, steps, and examples for accurate calculations.
Ever wondered how to find voltage when you already know power? You’re in the right place! Our Power to Voltage Calculator helps you quickly find the voltage for any type of electrical system DC, AC single-phase, or three-phase. No complex math, no confusion. Just enter your values and get instant results with clear steps.
We built this tool so anyone can easily calculate voltage from power, even without an electrical background. It’s fast, accurate, and perfect for both students and engineers.
Power to voltage conversion means finding the electric potential difference (voltage) when you already know the power (in watts) and other circuit details like resistance, current, or power factor.
Voltage tells you how much “push” the electric current gets. When power and other factors are known, it’s easy to calculate voltage using simple formulas.
There’s not just one formula. It depends on what type of circuit you have.
Formula:
V = √(P × R)
Where:
Example:
If Power = 100 W and Resistance = 25 Ω,
V = √(100 × 25) = √2500 = 50 V
Formula:
V = P / I
Where:
Example:
If Power = 100 W and Current = 2 A,
V = 100 / 2 = 50 V
Formula:
V = P / (I × PF)
Where:
Example:
If P = 1000 W, I = 5 A, PF = 0.8,
V = 1000 / (5 × 0.8) = 250 V
Formula:
V = P / (√3 × I × PF)
Where:
Example:
If P = 10,000 W, I = 20 A, PF = 0.9,
V = 10,000 / (1.732 × 20 × 0.9) = 320.75 V
It’s simple. First, find out what kind of circuit you have DC or AC. Then, use the right formula. For a DC circuit, you only need power and resistance or current. For AC circuits, you’ll also need the power factor.
Our online Power to Voltage Calculator handles all this automatically. You just type in your numbers and choose the type of circuit. The calculator then uses the right formula behind the scenes and shows the result instantly along with clear calculation steps.
It’s that easy. You’ll also see the formula used and how each value fits in.
What is 20 watts in volts?
If a 20 W device has a resistance of 5 Ω:
V = √(20 × 5) = √100 = 10 V
If a 20 W device uses 2 A current:
V = 20 / 2 = 10 V
How many watts is 140 volts?
Reverse it using the same formulas:
For example, if Resistance = 25 Ω,
P = V² / R = 140² / 25 = 784 W
So, 140 volts equals 784 watts across a 25 Ω resistor.
Because it’s accurate, clear, and built for real users. You don’t have to memorize formulas or worry about unit conversions. The tool automatically adjusts for kilo (k), milli (m), or micro (μ) prefixes and shows results in volts with proper units.
You’ll also see each step of the math, so it’s easy to learn how the formula works not just get the answer.
Whether you’re a student learning basic electricity or an engineer working on real circuits, our Power to Voltage Calculator makes life easier. It’s quick, clear, and precise.
Next time you need to find voltage from power, don’t grab your calculator — just use ours. You’ll save time and avoid mistakes.
Use V = √(P × R) for DC resistive circuits or V = P / I for direct current. For AC, use V = P / (I × PF).
If resistance is 5 Ω, voltage is 10 V (V = √(20 × 5)).
It depends on the load. For a 25 Ω resistor, P = 784 W.
Yes. It supports DC, single-phase AC, and three-phase AC systems.
Yes, it uses the same electrical formulas taught in physics and engineering.