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Radiation Exposure Converter

Convert radiation exposure between coulomb per kilogram, roentgen, milliroentgen, and microcoulomb per kilogram.

Convert instantly
Enter a value and choose the units. Your answer updates as you type.

Result

1000000 Microcoulomb per kilogram (µC/kg)

Educational reference only—not clinical or medical dosing advice. Dose decisions require a qualified radiation professional. Source: https://remm.hhs.gov/radmeasurement.htm

Quick reference
  • Coulomb per kilogram of air (C/kg)1 base units
  • Microcoulomb per kilogram (µC/kg)0.000001 base units
  • Roentgen (R)0.000258 base units
  • Milliroentgen (mR)2.58e-7 base units

About the Radiation Exposure Converter

Exposure is an ionization measure in air, historically reported in roentgens and now expressed in coulombs per kilogram of air. It is not absorbed dose and must not be substituted for gray or sievert without a defined radiation and material context. This page retains the standard SI relationship while keeping customary and legacy units explicit, which is important when a specification crosses disciplines.

Enter a value to see the conversion immediately—for example, 1 roentgen equals 2.58 × 10⁻⁴ C/kg of air. For a related check, use the Radiation Activity Converter and Radiation Absorbed Dose Converter; those tools describe a different but commonly connected quantity.

Frequently asked questions

What does the radiation exposure measure?

Exposure is an ionization measure in air, historically reported in roentgens and now expressed in coulombs per kilogram of air. It is not absorbed dose and must not be substituted for gray or sievert without a defined radiation and material context.

What is a useful reference conversion for radiation exposure?

1 roentgen equals 2.58 × 10⁻⁴ C/kg of air.

Are the factors on this page exact?

SI prefixes and internationally defined units use their standard factors. Legacy and customary factors are retained at their published scientific definitions and may be rounded only for display.

Take this calculation further

Browse the converters calculators collection for more tools in this subject.

For a related calculation, use Radiation Absorbed Dose Converter to convert absorbed radiation dose between gray, rad, milligray, centigray, and microgray for educational reference. Alternatively, use Radiation Activity Converter to convert radioactive activity between becquerels, curies, millicuries, megabecquerels, and microcuries.

For the underlying method, read A Quick Guide to Radiation Units for Students.