Size converter output, current, and protection with confidence. Test supply limits and single phase demand for safe sizing today.
| VLL (V) | Input Current (A) | Input PF | Efficiency | Single Voltage (V) | Output PF | Output kW | Output Current (A) |
|---|---|---|---|---|---|---|---|
| 400 | 25 | 0.90 | 0.95 | 230 | 0.92 | 14.81 | 70.57 |
| 415 | 32 | 0.88 | 0.94 | 230 | 0.95 | 19.79 | 90.59 |
| 480 | 20 | 0.90 | 0.96 | 240 | 0.90 | 14.37 | 66.55 |
The calculator uses standard power conversion relationships. Three phase real power is calculated as:
Pin = √3 × VLL × IL × PFin ÷ 1000
Estimated single phase output power is:
Pout = Pin × Efficiency
Single phase output current is:
I1φ = Pout × 1000 ÷ (V1φ × PFout)
When you start with a target single phase load, the required three phase current becomes:
IL = Ptarget × 1000 ÷ (√3 × VLL × PFin × Efficiency)
Recommended breaker values apply the selected safety margin to the calculated current.
Choose a calculation mode first. Use supply mode when you already know the three phase source voltage and current. Use target load mode when you know the single phase load you want to support. Enter power factor and efficiency carefully because they strongly affect the current estimate. Add the output voltage and safety margin. Press calculate to show the result above the form. Export the result as CSV for records or use the PDF button for printing.
A three phase to single phase converter calculator helps plan safe electrical conversion. Many workshops have three phase service. Some machines still need single phase power. Good sizing prevents overload, nuisance trips, and wasted capacity.
This tool estimates input power, output power, output current, and breaker size. It also works backward. You can start with a target single phase load. Then it estimates the three phase current required to support that load.
Three phase input power uses line voltage, line current, and power factor. The calculator then applies converter efficiency. That step gives a more practical single phase output value. Losses always matter in real installations.
Power factor changes current demand. A poor power factor means higher current for the same useful power. That can affect cable size, breaker selection, and voltage drop. This is why both input and output power factor fields are included.
No converter is perfect. Heat and switching losses reduce available output. Using a realistic efficiency value gives better planning numbers. It also helps compare different converter designs during early system evaluation.
The output current estimate is useful for receptacle sizing, branch protection, and load review. It helps determine whether the chosen single phase voltage can support the connected equipment safely.
This calculator supports preliminary sizing only. Final design should also check local code, conductor temperature rating, duty cycle, harmonic content, and motor starting conditions. Sensitive loads may require extra derating.
Use the example table to compare typical voltage and current combinations. Small changes in efficiency or power factor can create noticeable current changes. That makes early calculation very valuable during project planning.
It estimates usable single phase output from a three phase source or the three phase input needed for a target single phase load.
No. It is a planning tool. Final approval should use equipment data, local code rules, protection coordination, and conductor checks.
Efficiency represents conversion losses. A lower efficiency reduces available output power and raises the input power needed for the same load.
Lower power factor increases apparent power demand. That means more current is required to deliver the same real power.
Yes, for rough planning. But motors often need starting current review, duty analysis, and manufacturer guidance before final sizing.
The tool gives a margin-based estimate. Always verify breaker type, trip curve, local regulations, and load behavior before selection.
Enter the line-to-line supply voltage, such as 400 V, 415 V, or 480 V, depending on your system.
Yes. Use the CSV button for a spreadsheet-friendly file. Use the PDF button to print or save a PDF copy.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.