Mega-Ohm to Nanosiemens Calculator

By: Patrick Myers Patrick Myers is the CEO and Founder of Calculator Academy. He has over eight years of experience developing online calculators and holds a B.S. in Mechanical Engineering. His work focuses on formula implementation, calculator accuracy, unit conversions, and creating practical tools that are easy to use.

Last Updated: July 6, 2026
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This calculator was built with Calculator Academy’s community calculator studio with AI assistance, and was reviewed by the Calculator Academy team before publication.

About the Mega-Ohm to Nanosiemens Calculator

This tool converts between resistance in mega-ohms and conductance in nanosiemens using the reciprocal relationship between the two quantities. It is useful for electronics students, technicians, and engineers working with high resistances and very small conductance values.

How to use this calculator

  1. Enter a positive resistance value in the MΩ field, or leave it blank if solving from conductance.
  2. Enter a positive conductance value in the nS field if you want to solve for resistance.
  3. Click Calculate to convert the entered value.
  4. Review the converted MΩ and nS values, along with equivalent ohms and siemens.
  5. Click Reset to restore the default resistance value of 1 MΩ and clear the conductance field.

How it works

Resistance and conductance are reciprocals. In base SI units, conductance in siemens is calculated as G(S) = 1 / R(Ω). A higher resistance means a lower conductance, and a lower resistance means a higher conductance.

Because the calculator uses mega-ohms and nanosiemens, the unit conversion is built into the formula. Since 1 MΩ equals 1,000,000 Ω and 1 nS equals 0.000000001 S, the working formulas are G(nS) = 1000 / R(MΩ) and R(MΩ) = 1000 / G(nS).

The calculator requires the entered source value to be greater than zero. If both resistance and conductance are entered, the resistance field is used as the source value and the conductance field is overwritten with the calculated result.

Example calculation

If the resistance is 1 MΩ, the conductance is 1000 / 1 = 1000 nS. The equivalent base units are 1,000,000 Ω and 0.000001 S, so the result is 1 MΩ = 1,000 nS.

Frequently asked questions

Why does 1 MΩ equal 1,000 nS?

Conductance is the reciprocal of resistance. Since 1 MΩ is 1,000,000 Ω, its conductance is 1 / 1,000,000 S, which equals 0.000001 S or 1,000 nS.

Can I enter both resistance and conductance?

Yes, but the calculator uses the resistance value as the source if both fields contain valid positive numbers.

Why must the value be greater than zero?

A zero or negative resistance or conductance is not valid for this reciprocal conversion, and dividing by zero is undefined.

What is the formula to convert nanosiemens to mega-ohms?

Use R(MΩ) = 1000 / G(nS). For example, 500 nS converts to 2 MΩ.