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Free Ohm’s Law
Calculator

Solve any V/I/R/P pair, analyze a complete series or parallel resistor network, or design a current-limiting resistor against real E-series values. See power dissipation, resistor-tolerance current ranges, thermal headroom and circuit cross-checks—all locally in your browser.

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About Free Ohm's Law Calculator

Free advanced Ohm's Law Calculator with six-pair V/I/R/P solving, series/parallel resistor network analysis, current-limiting resistor design, E-series standard values, tolerance ranges, thermal margin, CSV export, and local persistence.

Workspace options

  • Known pair
  • Voltage
  • Voltage unit
  • Current
  • Current unit
  • Resistance

Available actions

  • V / I / R / P
  • Resistor network
  • Current-limit design
  • Copy circuit report
  • Export CSV
  • Reset