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Resistance Converter

Converter

Show all unit conversions

Enter a resistance value to see the conversion result.

About This Tool

Resistance Converter – Convert Between Ohm, kΩ, MΩ, and More

The Resistance Converter is a free online tool that instantly converts electrical resistance values between eleven units — from picoohms to teraohms, including the CGS units abohm and statohm. Whether you are an electronics engineer reading a resistor datasheet, a student solving circuit problems, or a technician measuring insulation resistance, this tool delivers accurate results in real time with configurable decimal precision.

All conversions normalize through the Ohm (Ω) as the SI base unit. Every cross-unit conversion follows the formula:

result = inputValue × (fromUnitFactor / toUnitFactor)

For SI-prefix units (pΩ through TΩ) all factors are exact powers of 10, so conversions are mathematically precise. For the statohm, the defined conversion factor c²/10⁹ ≈ 8.9876 × 10¹¹ is used, accurate to eleven significant figures. For extreme values, the tool automatically switches to scientific notation to keep results readable.

Supported Resistance Units

The converter covers the full practical range of resistance units used in modern electronics, power engineering, and scientific instrumentation.

  • Picoohm (pΩ) — 10⁻¹² Ω — Used in quantum resistance research, nanotechnology, and characterising contact resistance in nanoscale devices.
  • Nanoohm (nΩ) — 10⁻⁹ Ω — Encountered in superconducting material measurements and the characterisation of ultra-low-resistance contacts.
  • Microohm (µΩ) — 10⁻⁶ Ω — Standard range for measuring cable resistance, bus-bar resistance, switch contact resistance, and circuit breaker contacts in power systems.
  • Milliohm (mΩ) — 10⁻³ Ω — Typical for PCB trace resistance, fuse resistance, low-ESR capacitor equivalent series resistance (ESR), and shunt resistors used in current sensing.
  • Ohm (Ω) — base unit — The SI unit of electrical resistance, defined as the resistance between two points when a constant potential difference of one Volt produces a current of one Ampere. Named after Georg Simon Ohm.
  • Kilohm (kΩ) — 10³ Ω — The most common range for discrete resistors in signal conditioning, pull-up/pull-down circuits, and voltage dividers. A typical 4.7 kΩ resistor represents 4700 Ω.
  • Megaohm (MΩ) — 10⁶ Ω — Used in high-impedance circuits, oscilloscope input impedance (typically 1 MΩ), and insulation resistance testing of cables and motors.
  • Gigaohm (GΩ) — 10⁹ Ω — Characteristic of insulating materials, reverse-biased diode junctions, and the leakage resistance of high-quality capacitors.
  • Teraohm (TΩ) — 10¹² Ω — Found in ultra-high insulation resistance measurements of glass, ceramics, and specialised polymer films used in high-voltage applications.
  • Abohm (abΩ, CGS-EMU) — 10⁻⁹ Ω — The electromagnetic CGS unit of resistance. Equal to a nanoohm. Appears in older electrical engineering literature and some physics texts.
  • Statohm (statΩ, CGS-ESU) — ≈ 8.9876 × 10¹¹ Ω — The electrostatic CGS unit, derived from the speed of light. Used in Gaussian units and encountered in theoretical physics and historical electromagnetic texts.

Conversion Examples

The following examples illustrate common resistance conversions:

  • 4700 Ω → kΩ: 4700 × (1 / 10³) = 4.7 kΩ (standard E24 resistor value)
  • 10 kΩ → Ω: 10,000 × 1 = 10,000 Ω (pull-up resistor)
  • 1 MΩ → kΩ: 1 × (10⁶ / 10³) = 1,000 kΩ (oscilloscope input)
  • 100 mΩ → µΩ: 0.1 × (10⁻³ / 10⁻⁶) = 100,000 µΩ (shunt resistor)
  • 1 statΩ → MΩ: 1 × (8.9876 × 10¹¹ / 10⁶) ≈ 895,775 MΩ

Resistance in Electronics and Physics

Electrical resistance quantifies the opposition a conductor offers to the flow of electric current. It is defined by Ohm's law: R = V / I, where V is the voltage across the conductor in Volts and I is the current through it in Amperes. The result is expressed in Ohms (Ω).

Resistance arises from collisions between conduction electrons and the atomic lattice of the material. The resistance of a conductor depends on its resistivity (a material property), its length, and its cross-sectional area: R = ρ × L / A. This relationship explains why thin, long wires have higher resistance than thick, short ones — an important consideration in PCB layout, cable sizing, and power distribution design.

In AC circuits, the concept of impedance generalises resistance to include reactive components (inductance and capacitance), but the Ohm remains the unit for both resistance and impedance magnitude. Understanding resistance is foundational to calculating power dissipation (P = I² × R), voltage divider ratios, RC time constants, and signal attenuation in filter design.

Key Features

  • Instant conversion — results update automatically as you type, with no button press required.
  • Swap units — reverse the From/To direction in one click to immediately see the inverse conversion.
  • Show all units — toggle on a full reference table showing the input value in every supported unit simultaneously.
  • Real-world context — for common resistance values the tool displays a brief note explaining where that value appears in practice.
  • Adjustable precision — set decimal places from 0 to 10; the tool automatically uses scientific notation for extreme values.
  • CGS unit support — includes abohm and statohm for users working with historical or theoretical electromagnetic literature.

Frequently Asked Questions

Is the Resistance Converter free?

Yes, Resistance Converter is totally free :)

Can I use the Resistance Converter offline?

Yes, you can install the webapp as PWA.

Is it safe to use Resistance Converter?

Yes, any data related to Resistance Converter only stored in your browser (if storage required). You can simply clear browser cache to clear all the stored data. We do not store any data on server.

What resistance units does this converter support?

The Resistance Converter supports eleven units: Picoohm (pΩ), Nanoohm (nΩ), Microohm (µΩ), Milliohm (mΩ), Ohm (Ω), Kilohm (kΩ), Megaohm (MΩ), Gigaohm (GΩ), Teraohm (TΩ), Abohm (abΩ, CGS-EMU), and Statohm (statΩ, CGS-ESU). These cover the full practical range from sub-ohm conductor measurements to teraohm insulation resistance.

How does this resistance converter work?

All conversions normalize through the Ohm (Ω) as the SI base unit. The input value is first multiplied by the source unit's factor to obtain ohms, then divided by the target unit's factor to get the final result. For example, 4700 Ω to kΩ: 4700 × 1 / 1000 = 4.7 kΩ. This two-step method works for any combination of the eleven supported units, including the CGS units abohm and statohm.

What are abohm and statohm, and when are they used?

The abohm (abΩ) is the CGS electromagnetic unit of resistance, equal to 10⁻⁹ Ω. The statohm (statΩ) is the CGS electrostatic unit, equal to approximately 8.9876 × 10¹¹ Ω. Both originate from older CGS systems predating the SI, and are still encountered in some physics literature, historical documents, and specialized electromagnetic calculations.

What is the 'Show All Units' mode?

When enabled, Show All Units displays the input value converted into every supported resistance unit simultaneously, giving a full reference table. This is useful when you need a complete breakdown at a glance — for example, seeing that 1 kΩ equals 1,000 Ω, 1,000,000 mΩ, and 0.001 MΩ all at once.

How accurate are the conversions?

SI-prefix conversions (pΩ through TΩ) use exact powers of 10, so they are mathematically precise within IEEE 754 double-precision floating-point limits. The statohm conversion uses the defined factor of c²/10⁹ ≈ 8.987551787 × 10¹¹, which introduces a small rounding error only at high decimal precision. For most engineering purposes this is negligible.

What are typical resistance values in electronics?

Common reference values include: a 220 Ω current-limiting resistor for LEDs, a 10 kΩ pull-up resistor on microcontroller logic lines, the 1 MΩ input impedance of oscilloscope probes, and insulation resistance of ≥100 MΩ for healthy wiring. Very low values like microohms appear in cable and bus-bar resistance measurements, while gigaohms and teraohms describe insulating materials like glass and ceramics.