Amps to Watts Calculator
Calculate power (Watts) from current (Amps) and voltage for both AC and DC circuits.
Amps to Watts: Power Conversion Guide
Convert Amps (A) to Watts (W) with our comprehensive calculator. Learn how to calculate power consumption for DC and AC circuits with practical examples.
Basic Electrical Units
Ampere (A)
A unit of electric current measuring the rate of electric charge flow. One ampere equals one coulomb per second.
Watt (W)
A unit of power measuring the rate of energy usage. One watt equals one joule per second.
Conversion Formulas
DC Circuit Calculation
Where:
- P = Power in Watts
- I = Current in Amps
- V = Voltage in Volts
AC Single Phase Calculation
Where:
- PF = Power Factor
- I = Current in Amps
- V = RMS Voltage in Volts
AC Three Phase Calculation
Line to Line:
P(W) = √3 × PF × I(A) × VL-L(V)Line to Neutral:
P(W) = 3 × PF × I(A) × VL-N(V)Typical Power Factor Values
| Device | Typical Power Factor |
|---|---|
| Resistive Load | 1.0 |
| Fluorescent Lamp | 0.95 |
| Incandescent Lamp | 1.0 |
| Induction Motor (Full Load) | 0.85 |
| Induction Motor (No Load) | 0.35 |
| Synchronous Motor | 0.90 |
Important: These are typical values. For accurate calculations, use the actual power factor of your device.
Quick Reference Table (120V)
| Current (A) | Voltage (V) | Power (W) |
|---|---|---|
| 0.1 | 120 | 12 |
| 0.2 | 120 | 24 |
| 0.3 | 120 | 36 |
| 0.4 | 120 | 48 |
| 0.5 | 120 | 60 |
| 0.6 | 120 | 72 |
| 0.7 | 120 | 84 |
| 0.8 | 120 | 96 |
| 0.9 | 120 | 108 |
| 1.0 | 120 | 120 |
| 2.0 | 120 | 240 |
| 3.0 | 120 | 360 |
| 4.0 | 120 | 480 |
| 5.0 | 120 | 600 |
| 6.0 | 120 | 720 |
| 7.0 | 120 | 840 |
| 8.0 | 120 | 960 |
| 9.0 | 120 | 1080 |
| 10.0 | 120 | 1200 |
FAQs
What is the difference between Amps and Watts?
Amps measure the flow of electric current, while Watts measure the rate of energy usage. The relationship between them is defined by the voltage in the circuit.
How do I convert Amps to Watts?
To convert Amps to Watts, use the formula: P(W) = I(A) × V(V). You need to know the voltage to perform this calculation.
What is a Power Factor?
The Power Factor (PF) is a measure of how effectively electrical power is being converted into useful work output. It is the ratio of real power (Watts) to apparent power (Volt-Amps).
Why is the Power Factor important?
A low power factor indicates poor efficiency, which can lead to higher energy costs and potential penalties from utility companies.
