Unit Conversion

Resistance Converter

Convert between ohms, kilo-ohms and mega-ohms, and see the equivalent conductance.

Formula and sources updated · 2026-10-04Data sources · 1View algorithm, constants and default inputs (JSON)

Example

Decimal places

1 Ω = 0.001 kΩ

About this calculator

Resistance is measured in ohms and its reciprocal, conductance, in siemens. Electronic components are usually specified in kilo-ohms or mega-ohms because a single ohm is a very small resistance.

Worked example

calculated with the default values below

Value 1 · From Kilo-ohms (kΩ) · To Ohms (Ω) · Decimal places 4 Result 1,000 · Ohms 1,000.0000 Ω · Kilo-ohms 1.000000 kΩ · Conductance 0.001000000 S

Method and assumptions

Formula basis and scope

Convert electrical resistance via ohms and SI prefixes.

Only the displayed unit definitions are converted; rounding and measurement uncertainty are separate.

Data sources

NIST SP 811 — Conversion factors by quantity

Disclaimer

These calculators give general conversion results. Rounding and the precision of the value you enter both affect the output, so treat displayed decimals as indicative rather than exact.

Maintained by: CalcDelta Formula and sources updated · 2026-10-04

Implementation source

This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.

View algorithm, constants and default inputs (JSON)

Formula and variables

Ω = x×F_in; y = Ω÷F_out; S = 1÷Ω

x: Input value
Ω: Resistance in ohms
y: Converted value
S: Conductance in siemens
F_in: Input unit factor
F_out: Output unit factor

Conductance = 1 / resistance in siemens. At zero resistance, conductance is undefined and is left blank (not zero).

Embed this calculator

Copy the iframe snippet to place this calculator on your site. No account required. The snippet stays in sync with the inputs currently shown.

<iframe src="https://calcdelta.com/resistance-calculator/" title="Resistance Converter" loading="lazy" referrerpolicy="no-referrer-when-downgrade" style="width:100%;max-width:480px;height:720px;border:0;border-radius:12px;"></iframe>

Frequently asked questions

Why does the calculator also show conductance in siemens?

Conductance is the reciprocal of resistance, so the tool reports it automatically as one divided by the ohm value. A 1 kilo-ohm input becomes 1000 ohms and a conductance of 0.001 siemens, the same quantity read the other way. The milliohm option at 0.001 ohm per unit is there for very low resistances where a single ohm is too coarse to be useful.