⚡ Volts to Amps Converter
Converting voltage (V) into current (amps, A) is essential for accurate electrical calculations, circuit design, and electronics projects. Our volts to amps calculator simplifies this process using Ohm’s Law and standard formulas for both AC and DC circuits, helping you determine current flow instantly for home wiring, battery circuits, solar systems, and industrial applications.
How to Calculate Amps from Volts
Current can be calculated using either voltage and resistance or voltage and power. Using Ohm’s Law, the primary formulas are:
DC / General (P known): I (A) = P (W) ÷ V (V)
AC Single-phase: I (A) = P (W) ÷ (V (V) × PF)
AC Three-phase: I (A) = P (W) ÷ (√3 × V (V) × PF)
Voltage & Resistance: I (A) = V (V) ÷ R (Ω)
Where PF is the power factor for AC loads. Using these formulas ensures accurate results for circuit design, wire selection, and breaker sizing.
Why Use a Volts to Amps Calculator?
Manual calculations can be prone to mistakes, especially when working with multiple devices or circuits. An online calculator provides:
Instant current calculation in amperes
Conversion for voltage, resistance, and power units
Support for AC and DC circuits
Practical load estimation for batteries, appliances, and solar systems
Step-by-step calculation for DIY electronics and industrial circuits
Step-by-Step Usage of the Calculator
Select your system type: DC, AC single-phase, or AC three-phase.
Enter the voltage (V).
Input power (W) or resistance (Ω).
Optionally, include power factor (PF) for AC circuits.
Click Calculate to see the amperage (A).
Round up to select the next standard breaker or wire size for safety.
Quick Reference Conversion Table: Real-World Examples
| Power (W) | Voltage (V) | Current (A) |
|---|---|---|
| 60 W | 20 V | 3.00 A |
| 120 W | 12 V | 10.00 A |
| 240 W | 24 V | 10.00 A |
| 500 W | 12 V | 41.67 A |
| 1000 W | 48 V | 20.83 A |
| 100 W | 230 V | 0.43 A |
| 500 W | 120 V | 4.17 A |
| 1500 W | 230 V | 6.52 A |
| 2000 W | 120 V | 16.67 A |
| 3000 W | 230 V | 13.04 A |
| 5000 W | 400 V | 12.50 A |
| 10000 W | 400 V | 25.00 A |
| 15000 W | 415 V | 36.14 A |
| 20000 W | 380 V | 52.63 A |
| 30000 W | 415 V | 69.88 A |
| 65 W | 5 V | 13.00 A |
| 250 W | 36 V | 6.94 A |
| 600 W | 120 V (PF=0.8) | 6.25 A |
| 2000 W | 240 V | 8.33 A |
| 10000 W | 415 V (3-phase, PF=0.9) | 15.50 A |
Practical Applications and Benefits
Using a volts to amps calculator helps you:
Design safe electrical circuits for homes, industry, and renewable energy
Estimate amperage for batteries, solar panels, and appliances
Choose the correct breaker rating and wire gauge
Include power factor for motors and inductive loads to prevent overloads
Optimize inverter and charge controller sizing for solar systems
Related Tools and Resources
Watts to Amps Calculator: convert power to current for AC/DC circuits
Ohm’s Law Calculator: compute voltage, current, or resistance in electrical circuits
Electrical Circuit Calculators: estimate load, power, and component sizing
Frequently Asked Questions (FAQ)
Q: How do I calculate amps from volts and watts?
A: Use I = P ÷ V (amps = watts divided by volts). For AC circuits, include the power factor: I = P ÷ (V × PF).
Q: Can I convert volts to amps without watts?
A: Not directly. You need either power (watts) or resistance (ohms). Using resistance, apply Ohm’s Law: I = V ÷ R.
Conclusion
A volts to amps calculator is a vital tool for electricians, engineers, students, and DIY enthusiasts. By combining formulas, step-by-step instructions, and real-world examples, this calculator enables accurate current calculation, proper wire sizing, safe breaker selection, and efficient circuit planning for all AC and DC applications.
Want a fast way to convert voltage into current? Use the Volts to Amps Converter: enter the voltage and the power (watts), and the calculator gives you the amperes (amps) instantly. This voltage-to-current conversion is essential for appliance sizing, wire gauge selection, breaker sizing, and solar system planning. For AC systems you can include a power factor to get accurate real-world amps. Our online electrical conversion tool applies the correct volts to amps formula and Ohm’s Law where needed so electricians, engineers, students and DIYers can quickly check loads and avoid overloads.
What is a Volts → Amps Conversion?
Converting volts to amps is the process of calculating electrical current from voltage and power. In simple terms, voltage (V) is the electrical pressure and amperage (A) is the flow. The most common formulas are I = P ÷ V (for DC or when wattage is known) and I = P ÷ (V × PF) for AC where PF is power factor. For three-phase systems the formula uses √3. This conversion helps determine circuit capacity, choose the correct breaker and wire size, and size inverters or charge controllers for solar installations. Use a reliable volts to amps calculator to avoid guesswork.
How the Volts to Amps Formula Works
The volts to amps formula links power, voltage and current. For a given power (watts), current equals power divided by voltage; that’s the core conversion used in all electrical conversion tools. If you know watts and volts you can convert volts to amps without measuring current directly. In AC systems, the power factor (PF) adjusts apparent power to real power — include PF to get accurate amperes. For three-phase loads divide by (√3 × V × PF). These straightforward equations are the basis of every voltage to current calculator and help with safe electrical design.
Key formulas (clean):
DC / General (when P known):
I (A) = P (W) ÷ V (V)AC Single-phase:
I (A) = P (W) ÷ (V (V) × PF)AC Three-phase:
I (A) = P (W) ÷ (√3 × V (V) × PF)
How to Use This Volts to Amps Converter
Using the converter is fast and intuitive. Choose the system type (DC, AC single-phase, or AC three-phase), enter the voltage and the device power in watts, and add the power factor for AC loads if you know it. Click Calculate: the tool returns the amperage (A) you can expect. For safety rounds, always select the next standard breaker/wire size above the calculated current. This voltage to current calculator replaces manual math and helps with appliance sizing, inverter selection, and quick electrical load checks — ideal as an online electrical calculator for field and classroom use.
Step-by-step:
Pick system: DC / AC 1-Phase / AC 3-Phase
Enter Voltage (V).
Enter Power (W).
(Optional) Enter Power Factor (PF) for AC.
Click Calculate → view Amps (A).
Quick Reference Conversion Table: 20 Real-World Examples
| Power (W) | Voltage (V) | Current (A) |
|---|---|---|
| 60 W | 20 V | 3.00 A |
| 120 W | 12 V | 10.00 A |
| 240 W | 24 V | 10.00 A |
| 500 W | 12 V | 41.67 A |
| 1000 W | 48 V | 20.83 A |
| 100 W | 230 V | 0.43 A |
| 500 W | 120 V | 4.17 A |
| 1500 W | 230 V | 6.52 A |
| 2000 W | 120 V | 16.67 A |
| 3000 W | 230 V | 13.04 A |
| 5000 W | 400 V | 12.50 A |
| 10000 W | 400 V | 25.00 A |
| 15000 W | 415 V | 36.14 A |
| 20000 W | 380 V | 52.63 A |
| 30000 W | 415 V | 69.88 A |
| 65 W | 5 V | 13.00 A |
| 250 W | 36 V | 6.94 A |
| 600 W | 120 V (PF=0.8) | 6.25 A |
| 2000 W | 240 V | 8.33 A |
| 10000 W | 415 V (3-phase, PF=0.9) | 15.50 A |
Safety & Practical Notes
Round up: After calculating amps, round up to choose the next standard breaker rating.
Wire gauge: Use the calculated current to pick the correct conductor size (wire gauge) for continuous loads.
Power factor: Motors and inductive loads often have PF < 1; include PF to get accurate amp values.
Overload protection: Proper sizing prevents tripped breakers and overheating.
Solar & inverter sizing: Use the tool to select charge controllers and inverter ratings based on calculated currents.
Short FAQ
Q — How do I calculate amps from volts and watts?
A — Use I = P ÷ V (amps = watts divided by volts). For AC include PF: I = P ÷ (V × PF).
Q — Can I convert volts to amps without watts?
A — Not directly. You need either power (watts) or resistance (ohms). With resistance use Ohm’s law: I = V ÷ R.
Q — What is power factor and why does it matter?
A — Power factor (PF) is the ratio of real power to apparent power in AC circuits. A lower PF means more current for the same wattage—include PF for accurate amperage estimates.
Q — Are volts or amps more dangerous?
A — Current (amps) causes harm to the human body; voltage pushes current. Safety relies on both, but protective focus is on limiting current.