Electrical Resistance Conversion Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 9/8/2026
To convert an electrical resistance, bring it to ohms (Ω) then convert it to the desired unit. Example: a resistance of 5 kΩ equals 5,000 Ω.
Explanation
The ohm (Ω), the SI unit of electrical resistance, measures a component's opposition to the flow of electric current. Its decimal multiples (kilohm, megohm, gigohm) and its common submultiple (the milliohm) follow standard SI prefixes, used according to the component's order of magnitude: common resistances in consumer electronics are generally expressed in ohms or kilohms (a 4.7 kΩ resistor, for example, is one of the most common values on a circuit board), while the milliohm is used to measure very low resistances (a battery's internal resistance or a current-measuring shunt), and the megohm or gigohm for very high insulation resistances. This calculator converts between these different scales by passing through the ohm as a pivot unit. To calculate a resistance from voltage and current rather than converting an already known value, see our Ohm's law calculator.
Example: a resistance of 5 kΩ
Inputs
Value: 5. Starting unit: kΩ. Target unit: Ω.
Calculation
The prefix 'kilo' equals 1,000: 5 kΩ = 5 × 1,000 = 5,000 Ω.
Result
A resistance of 5 kΩ equals 5,000 Ω.
Frequently asked questions
Why are resistances in electronics often expressed in kΩ rather than Ω?
Because most resistors used in common electronic circuits have values of several hundred to several thousand ohms, which makes the kilohm more readable and practical to work with than systematically writing long numbers in raw ohms.
What does a milliohm measure in practice?
The milliohm is used to express very low resistances, generally under 1 Ω, such as a battery's internal resistance, that of a large-gauge electrical cable, or a shunt used to measure a large current through the voltage drop it causes.
How do you calculate a resistance rather than convert it?
This calculator converts an already known resistance value between units; to calculate a resistance from other electrical quantities (voltage and current), use our Ohm's law calculator instead, which directly applies the relationship R = V ÷ I.
Do other electronic components also have their own unit prefixes to convert?
Yes, each component has its own typical orders of magnitude: see our electrical capacitance conversion calculator for capacitors, most often expressed in picofarads, nanofarads, or microfarads rather than raw farads.