Effective dose unit converter

This dose unit converter allows users to convert between commonly used radiation dose units, including both SI units and legacy units that continue to appear in historical records, international guidance, and training materials.

It is intended to support clear communication, sense-checking of values, and consistent interpretation of dose information across different regulatory, technical, and educational contexts.

What this calculator does

Radiation dose may be expressed in a range of units depending on context, time period, or jurisdiction. While the sievert (Sv) and its sub-multiples are now standard within UK and international radiation protection frameworks, other units such as the rem and millirem remain in common use in older documentation and non-UK sources.

This calculator provides straightforward conversion between these radiation dose units using accepted, fixed relationships between units.

Supported dose units

The calculator supports conversion between the following dose units:

  • sievert (Sv)

  • millisievert (mSv)

  • microsievert (µSv)

  • nanosievert (nSv)

  • rem

  • millirem (mrem)

  • microrem (µrem)

Conversions are based on the standard relationship:

  • 1 Sv = 100 rem

Appropriate use

This calculator is suitable for use when:

  • reviewing legacy reports or historical dose records;

  • interpreting international publications or training materials;

  • converting dose values for communication or comparison purposes;

  • supporting education and professional development activities.

It is not intended to replace formal dose assessment, dosimetry evaluation, or regulatory submissions.

Important note

The results provided by this calculator are indicative only and assume idealised unit relationships. They do not account for uncertainty, measurement methodology, or exposure context.

Outputs should not be relied upon as the sole basis for compliance decisions, dose restriction assessments, or safety justifications. Where required, advice should be sought from a competent Radiation Protection Adviser (RPA) or other suitably qualified professional.

Related guidance

Effective dose quantities and units are defined and discussed within internationally recognised guidance, including publications from the International Commission on Radiation Units and Measurements (ICRU). These concepts underpin the dosimetric framework adopted by the International Commission on Radiological Protection (ICRP) and are implemented within UK legislation and associated Approved Codes of Practice and guidance.

Users should ensure that dose values are interpreted within their correct regulatory and exposure context.

For advice on applying dose information within your organisation or regulatory framework, please contact RP Alba Ltd.