Ohm's Law Calculators and Formulas

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Before clicking in each Ohm's Law calculator for the answer, enter numbers into the equation you wish to use to calculate for Current, Power, Resistance, or Voltage. *Updated January 8, 2011 to accept/change commas to periods for those that use commas as decimal separators.

Ohm's Law Calculators

• Current (I) Calculators
• Power (P) Calculators
• Resistance (R) Calculators
• Voltage (E) Calculators

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Current Calculators

Calculate for Current (I)

I = P / E

Power	Voltage	Current

Watts	Volts	Amps

I = Square Root of (P / R)

Power	Resistance	Current

Watts	Ohms	Amps

I = E / R

Voltage	Resistance	Current

Volts	Ohms	Amps

Power Calculators

Calculate for Power (P)

P = I ² x R

Current	Resistance	Power

Amps	Ohms	Watts

P = E x I

Voltage	Current	Power

Volts	Amps	Watts

P = E ² / R

Voltage	Resistance	Power

Volts	Ohms	Watts

Resistance Calculators

Calculate for Resistance (R)

R = P / I ²

Power	Current	Resistance

Watts	Amps	Ohms

R = E / I

Voltage	Current	Resistance

Volts	Amps	Ohms

R = E ² / P

Voltage	Power	Resistance

Volts	Watts	Ohms

Voltage Calculators

Calculate for Voltage (E)

E = I x R

Current	Resistance	Voltage

Amps	Ohms	Volts

E = P / I

Power	Current	Voltage

Watts	Amps	Volts

E = Square Root of (P x R)

Power	Resistance	Voltage

Watts	Ohms	Volts

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• Ohm's Law
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