power to current calculator
Convert electrical power (W) to current (A) for DC, single-phase AC, and three-phase AC. Enter power, voltage, and power factor to get accurate RMS or DC current.
three-phase current calculator
Divide voltage by power and add in the power factor; multiply voltage by 1.732 to calculate line currents in three times a three-phase circuit.
Formula & Table Summary:
DC: I = P / V
1-phase AC: I = P / (V · PF)
3-phase AC: I = P / (√3 · V_LL · PF)
Inputs: P (W), V (V), PF (0–1). Output: I (A).
apparent current calculator
Enter Power (W), Voltage (V), and Power Factor (PF) to calculate current (A) with DC, single-phase ac or three-phase ac using the correct formula.Use this calculator to use in speedily circuit sizing checks, selecting breakers, energy audits, and determining that conductors or protective devices are not overloaded. Note:in apparent power (VA) or with line-to-neutral voltage on three-phase systems multiply voltage input by powers of two; reduce formula to the order of theSIGMAS.
watts to amps calculator
| Type | P (W) | V (V) | PF | I (A) |
|---|---|---|---|---|
| DC | 1200 | 48 | 1.00 | 25.0000 |
| 1-phase | 2300 | 230 | 0.80 | 12.5000 |
| 1-phase | 5000 | 120 | 0.95 | 43.8596 |
| 3-phase | 10000 | 415 | 0.90 | 15.4578 |
| 3-phase | 50000 | 11000 | 0.85 | 3.0874 |
Frequently Asked Questions - power to current calculator:
How do I calculate current from power for DC?
Use I = P / V (amps = watts ÷ volts).
What formula for single-phase AC with power factor?
I = P / (V · PF), where PF is 0–1 (use 1 for purely resistive loads).
What about three-phase systems?
Use I = P / (√3 · V_LL · PF) where V_LL is line-to-line voltage and PF is power factor.
If I only know VA (apparent power), what do I use?
For single-phase: I = S / V. For three-phase: I = S / (√3 · V_LL).
Can current exceed power divided by phase voltage?
If PF < 1, current will be higher than P/V because real power is reduced by PF; use PF in the denominator.
What power factor should I assume if unknown?
If unknown and load is likely resistive, assume PF ≈1. For motors or inductive loads, assume PF 0.8–0.9 unless measured.
Does this include starting/inrush currents?
No. These formulas give steady-state RMS current from steady real power. Motor starting and inrush require separate transient calculations.
How to size a breaker from calculated current?
Choose next standard breaker rating above the continuous load plus apply code derating (e.g., 125% for continuous loads per many electrical codes). Verify with local rules.
Are harmonic currents included?
No. Harmonics (from non-linear loads) increase RMS current; use measurements or harmonic analysis for accurate sizing.
What voltage should I use for 3-phase Y (wye) systems?
Use line-to-line voltage (V_LL) with the √3 formula for line current. If you must use V_LN, convert or use phase formulas accordingly.
Related Posts
kW to kVA Calculator
Easily convert kilowatts (kW) to kilovolt-amperes (kVA) with our accurate calculator. Supports single-phase and three-phase systems.
Hoist Motor Power Calculator
Calculate the required hoist motor power based on load, lifting height, and speed. Ideal for selecting motors for cranes, lifts, and material handling systems.
kw to current calculator
Calculate current from kilowatts (KW), voltage, and power factor for AC or DC systems accurately.
Voltage Imbalance Calculator
Calculate percent voltage imbalance (PVU) using both phase-deviation and negative-sequence methods. Includes formulas, examples, and troubleshooting tips.
Air conditioner current calculator
Calculate your air conditioner’s running current (amps) from power, voltage, and efficiency. Supports kW, BTU/hr, single-phase, and three-phase AC systems.
CT Ratio To Current Calculator
Easily calculate secondary current from the CT ratio and primary current. Ideal for electrical protection, metering, and transformer testing applications.