Amps to Watts Calculator

Convert amps to watts for DC, single-phase, or three-phase AC instantly. Enter current, voltage, and power factor for accurate electrical engineering calculations.

Full original guide (expanded)

Amps to Watts Calculator

Convert current (amps) to power (watts) for DC, single-phase AC, or three-phase AC circuits. Enter your data and instantly see accurate results and formulas.

Required for AC only; leave blank for DC

Formulas Used

  • DC: P = I × V
  • AC 1-phase: P = I × V × PF
  • AC 3-phase: P = √3 × I × V × PF (V = line-to-line)

Worked Example

  • AC 3-phase: I = 14, V = 400, PF = 0.9
  • P = √3 × 14 × 400 × 0.9 ≈ 8,726 W

Frequently Asked Questions

Do I need power factor for DC?

No, DC does not use PF. Leave blank for DC.

What if I only know apparent power (kVA)?

Multiply kVA by PF to get real power (watts).

Are results suitable for sizing conductors?

Use results as a starting point. For safety and code compliance, always consult an electrician or reference local regulations.

Tool by Ugo Candido. Last reviewed: 2025.
Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Unit conversion
\[y = x\cdot k\]
y = x * k
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
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Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft
Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog
  • 0.1.0-draft — 2026-01-19: Initial draft (review required).