Electrical Resistance Unit Converter
Convert electrical resistance unit between units instantly. Includes conversion tables, common equivalents, and calculation formulas.
Formula
Target = Value x (FromFactor / ToFactor) | Conductance (S) = 1 / Resistance (Ohm)
Resistance unit conversion uses metric prefixes. Each unit differs by a factor of 1000 from its neighbor. The base unit is the ohm. Microohms are 10 to the negative 6 ohms, milliohms are 10 to the negative 3, kilohms are 10 to the 3, megohms are 10 to the 6, and gigohms are 10 to the 9. Conductance in siemens is the inverse of resistance in ohms.
Worked Examples
Example 1: Resistor Color Code Conversion
Problem: A resistor has bands showing 4.7 kilohms. Express this in ohms and megohms.
Solution: 4.7 kOhm x 1000 = 4700 Ohm\n4700 Ohm / 1,000,000 = 0.0047 MOhm\nConductance = 1 / 4700 = 0.000213 S = 0.213 mS
Result: 4.7 kOhm = 4,700 Ohm = 0.0047 MOhm
Example 2: PCB Trace Resistance
Problem: A PCB trace has a resistance of 15 milliohms. Convert to ohms and microohms.
Solution: 15 mOhm x 0.001 = 0.015 Ohm\n15 mOhm x 1000 = 15,000 uOhm
Result: 15 mOhm = 0.015 Ohm = 15,000 uOhm
Frequently Asked Questions
What is electrical resistance and what unit is it measured in?
Electrical resistance is the opposition to the flow of electric current through a conductor. It is measured in ohms, symbolized by the Greek letter omega. The ohm is defined as the resistance that allows one ampere of current to flow when one volt is applied across the conductor. Resistance depends on the material, length, cross-sectional area, and temperature of the conductor.
How do I convert between different resistance units?
Resistance units follow standard metric prefixes. One kilohm equals 1000 ohms, one megohm equals 1,000,000 ohms, and one milliohm equals 0.001 ohms. To convert, multiply or divide by powers of 1000. For example, to convert 4700 ohms to kilohms, divide by 1000 to get 4.7 kilohms. This converter handles all common resistance unit conversions automatically.
What is the relationship between resistance and conductance?
Conductance is the reciprocal of resistance. It measures how easily current flows through a conductor, while resistance measures how much current is opposed. Conductance is measured in siemens (S), where 1 siemens equals 1 divided by 1 ohm. A 100 ohm resistor has a conductance of 0.01 siemens or 10 millisiemens. This inverse relationship is fundamental in circuit analysis.
What are common resistance values used in electronics?
Standard resistor values follow the E-series system. The most common series is E12, which includes values like 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, and 82 ohms, and their multiples. Typical applications use resistors from a few ohms (power circuits) to several megohms (sensor circuits). Pull-up resistors commonly range from 1 kilohm to 10 kilohms, and voltage dividers use various combinations.
Why is unit analysis important in physics?
Unit analysis (dimensional analysis) helps verify equations are correct. Both sides of an equation must have the same units. For example, force (N) = kg * m/s^2. If your answer has unexpected units, there is likely an error in your calculation. Always carry units through every step.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.