Resistance Converter
Instantly convert resistance with our free converter. See conversion tables, formulas, and step-by-step explanations.
Formula
R (ohms) = V / I | Conductance (S) = 1 / R | Converted = Input x (From Factor / To Factor)
Resistance conversion uses the ohm as the base SI unit. All metric resistance units convert through standard SI prefixes. The siemens (conductance) is the reciprocal of resistance. CGS units relate through electromagnetic (abohm = 1 nanoohm) and electrostatic (statohm = 8.988 x 10^11 ohm) conversion factors.
Worked Examples
Example 1: Resistor Value Conversion
Problem: A circuit diagram specifies a 4.7 kilohm resistor. Express this in ohms and megohms.
Solution: 4.7 kohm to ohms: 4.7 x 1000 = 4700 ohms\n4.7 kohm to Mohm: 4.7 / 1000 = 0.0047 Mohm\nConductance: 1/4700 = 0.000213 S = 0.213 mS\n4.7k is a standard E24 resistor value.
Result: 4.7 kohm = 4700 ohms = 0.0047 Mohm
Example 2: Wire Resistance Measurement
Problem: A copper wire measures 50 milliohms resistance. Convert to ohms and microhms.
Solution: 50 mohm to ohms: 50 x 0.001 = 0.05 ohms\n50 mohm to uohm: 50 x 1000 = 50,000 uohm\nThis low resistance is typical for short lengths of heavy gauge wire.
Result: 50 mohm = 0.05 ohms = 50,000 uohm
Frequently Asked Questions
What is electrical resistance and what is an ohm?
Electrical resistance is the opposition to the flow of electric current in a conductor. The ohm is the SI unit of resistance, defined as the resistance between two points when a constant potential difference of one volt produces a current of one ampere (R = V/I). It is named after German physicist Georg Simon Ohm who formulated Ohm Law. Resistance depends on the material resistivity, length, and cross-sectional area of the conductor.
What is the relationship between resistance and conductance?
Conductance is the reciprocal (inverse) of resistance. The SI unit of conductance is the siemens (S), formerly called the mho. If a resistor has 1000 ohms of resistance, its conductance is 1/1000 = 0.001 siemens or 1 millisiemens. High resistance means low conductance and vice versa. Conductance is useful in parallel circuit analysis and in describing the behavior of semiconductors and electrolytic solutions.
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Is Resistance Converter free to use?
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What formula does Resistance Converter use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
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