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How to measure and report a gender pay gap

UK employers with 250 or more employees are required to measure and publish their gender pay gap each year. This guide explains what the gender pay gap is, how to calculate the required metrics and how to report gender pay and bonus gaps accurately and compliantly.

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By Mark Crail, Brightmine Content Director | Brightmine Editor: Susie Munro

The Equality Act 2010 (Gender Pay Gap Information) Regulations 2017 (SI 2017/172) brought into effect a requirement for large employers to report publicly every year on the differences in the aggregate pay and bonuses of men and women. The Regulations mandate how private-sector and voluntary-sector organisations in England, Scotland and Wales with 250 or more employees must calculate a standard set of key metrics on their gender pay and gender bonus gaps and the format and medium in which they must report them.

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  • What is the gender pay gap?
  • Factors affecting the gender pay gap
  • Why report on the gender pay gap?
  • What do the Regulations require employers to report?
  • Relevant employers and relevant employees
  • Preparing to report the gender pay and gender bonus gaps
  • Data required to calculate the gender pay gap
  • Calculating the hourly rate
  • Calculating the mean gender pay gap
  • Calculating the median gender pay gap
  • Calculating the mean gender bonus gap
  • Calculating the median gender bonus gap
  • Calculating the proportion of men and women paid a bonus
  • Calculating the proportion of men and women in quartile pay bands
  • Reporting the gender pay and gender bonus gap data
  • The public-sector gender pay gap reporting requirement
  • The Brightmine Pay Equity Analytics gender pay gap reporting service

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Latest updates

Updated to refer to the latest national gender pay gap data from the Annual Survey of Hours and Earnings 2025.

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About the author

Mark Crail

Mark Crail is a former content director for Brightmine in the UK. He had day-to-day responsibility for Brightmine Salary surveys and Benchmarking services, and led Brightmine’s wide-ranging research programmes.

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