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RK
Rojony Khatun
Last updated: Jun 3, 2026

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.

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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.

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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).

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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

TypeP (W)V (V)PFI (A)
DC1200481.0025.0000
1-phase23002300.8012.5000
1-phase50001200.9543.8596
3-phase100004150.9015.4578
3-phase50000110000.853.0874
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Frequently Asked Questions - power to current calculator:

Use I = P / V (amps = watts ÷ volts).
I = P / (V · PF), where PF is 0–1 (use 1 for purely resistive loads).
Use I = P / (√3 · V_LL · PF) where V_LL is line-to-line voltage and PF is power factor.
For single-phase: I = S / V. For three-phase: I = S / (√3 · V_LL).
If PF < 1, current will be higher than P/V because real power is reduced by PF; use PF in the denominator.
If unknown and load is likely resistive, assume PF ≈1. For motors or inductive loads, assume PF 0.8–0.9 unless measured.
No. These formulas give steady-state RMS current from steady real power. Motor starting and inrush require separate transient calculations.
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.
No. Harmonics (from non-linear loads) increase RMS current; use measurements or harmonic analysis for accurate sizing.
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.
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