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What is the gender pay gap and how is it measured?

The gender pay gap is the average difference in pay between employed men and women, and the headline number shrinks a lot once factors like hours and occupation are accounted for.

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Covers: This page explains what the gender pay gap is, how it differs from equal pay, and the main ways it is measured, including unadjusted and adjusted gaps and common data sources. It does not cover pay discrimination law in specific countries or provide legal advice.

Also answers: What is the gender pay gap? · How is the gender pay gap calculated? · Gender pay gap explained · Difference between gender pay gap and equal pay

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Photo: Carrie Allen www.carrieallen.com

The short answer

Evidence-backed AI-prepared starting map

The gender pay gap is the average difference between the remuneration of employed men and women. It is usually reported as an unadjusted figure — the raw difference in earnings between male and female workers — while an adjusted figure controls for differences such as hours worked, occupation, education and job experience. The two can diverge sharply: in the United States in 2024, Pew Research found women earned 85% as much as men (up from 81% in 2003), but once hours worked, occupation, education and experience are controlled for, the gap narrows to women earning about 95% as much as men. Because organisations use different methodologies, the headline number varies by source.12

What this rests on6 independent sources
  • Evidence 19

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In brief

  1. The gender pay gap is the average difference in remuneration between employed men and women; it is a workforce-level measure, not a same-job comparison.1

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  2. Unadjusted gaps compare raw earnings; adjusted gaps control for hours, occupation, education and experience, and are much smaller.1

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  3. In the US in 2024, women earned 85% as much as men unadjusted, narrowing to about 95% after controls.2

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  4. Decomposition studies often leave a large unexplained share — 64.90% in a Togo poultry study — which authors attribute to likely wage discrimination.3

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  5. The headline figure depends on methodology, so comparisons across sources require checking which measure is used.2

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At a glance

The picture in numbers

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Pew Research, United States, 2024
  • Unadjusted85%
  • Adjusted for hours, occupation, education, experience95%
US women's earnings as a share of men's, unadjusted vs adjusted2
Different measures, not directly comparable
  • Global unadjusted68.5%
  • US women's earnings as share of men's85%
Reported gender pay gap figures from different sources

The evidence behind it

6 sources
  • Other studies and data4
  • Background2

Published in 2026

Sources on this page by kind and year
SourceKindYear
Gender pay gap in the United States (Wikipedia)BackgroundUnknown
Gender pay gap (Wikipedia)BackgroundUnknown
Mind the (gender pay) gap: the role of board gender composition.Other studies and data2026
Gender pay gaps in nursing and midwifery: Evidence from cross-country comparative analysis.Other studies and data2026
Unpacking gender wage inequality in poultry farming: evidence from Togo through Oaxaca-Blinder analysis.Other studies and data2026
Pay gaps in the National Health Service: Gender and sexuality.Other studies and data2026

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What it means for you

Which fits you?

Pick the situation closest to yours. Each answer says what it rests on.

If you see a headline pay-gap number

check whether it is unadjusted or adjusted, and whether it is an earnings ratio (e.g. 85%) or a percentage gap, before comparing it with other figures.12

Evidence-backed

If you work in a large UK firm

board gender composition is associated with a smaller reported gap: a one-percentage-point rise in female director share reduced the gap by 0.043 percentage points, with parity closing about one-sixth of a 9.7% gap.5

Evidence-backed

If you are looking at a highly feminised occupation such as nursing or midwifery

raw pay gaps give an incomplete picture; adjusted analyses across 27 countries still show significant conditional gaps pointing to wage-setting and progression structures.4

Evidence-backed

If you want to understand what drives a specific gap

decomposition methods can separate the share explained by characteristics such as age, experience and responsibility from the unexplained residual.3

Evidence-backed

The full story · 4 chapters

01

What the gender pay gap is — and what it is not

AI summary:The gap is a workforce-level average difference in pay, not a same-job comparison, and it varies by industry, race and age.

Evidence-backed

Evidence-backed: The gender pay gap (or gender wage gap) is the average difference between the remuneration for men and women who are employed. It is a workforce-level statistic, not a comparison of a specific man and woman doing the same job. In most countries, women are paid less than men for the same work, but the headline gap and the same-work comparison are distinct concepts.1

Evidence-backed

Evidence-backed: The gap is not one number. It varies by industry, and is influenced by factors such as race and age. The causes are debated; commonly cited explanations include the "motherhood penalty," hours worked, occupation chosen, willingness to negotiate salary, and gender bias.2

02

How the gap is measured: unadjusted and adjusted

AI summary:Unadjusted gaps compare raw earnings, while adjusted gaps control for hours, occupation, education and experience and are much smaller.

Evidence-backed

Evidence-backed: The unadjusted (non-adjusted) pay gap is the average difference in yearly earnings between male and female workers. The adjusted pay gap is the difference between how much men and women make for the same work, taking into account differences in hours worked, occupations chosen, education attained, and job experience. The adjusted gap is much smaller than the unadjusted one.1

Evidence-backed

Evidence-backed: Decomposition methods such as Oaxaca-Blinder split a raw gap into a portion explained by differences in individual characteristics and an unexplained portion. In a study of 200 poultry-farming employees across six prefectures in Togo's Maritime region, 35.10% of the total wage gap was explained by differences such as age, experience and level of responsibility, while 64.90% remained unexplained — a residual the authors interpret as likely reflecting wage discrimination.3

Evidence-backed

Evidence-backed: A cross-country analysis of nursing and midwifery found that raw pay gaps alone are insufficient for understanding inequality in highly feminised occupations. Distributional decompositions showed a substantial share of observed gaps remained unexplained by measured characteristics in several countries, and regression analyses confirmed statistically significant conditional pay gaps. Where gaps persist after adjustment, the authors point to structural and institutional factors related to wage-setting and progression.4

03

Headline figures and how they move

AI summary:US women earned 85% as much as men in 2024, narrowing to about 95% after controls, and figures vary by methodology.

Evidence-backed

Evidence-backed: In the United States in 2024, Pew Research found women earned 85% as much as men, up from 81% in 2003. Controlling for hours worked, occupations chosen, and education and job experience, the gap diminishes to women earning 95% as much as men. The exact figure varies because different organisations use different methodologies.21

Evidence-backed

Evidence-backed: The global unadjusted gender pay gap is reported as 68.5%. The gap has recently decreased most rapidly in Global South developing countries, while in the European Union there has been little change in the 21st century. Developed Asian economies have also entered a stage of relative stability, though income disparities remain relatively larger than in Western economies.1

04

What shapes the gap: firm-level and sector evidence

AI summary:UK firm data link more female directors to smaller gaps, and NHS survey data show pay differences within the LGB+ group.

Evidence-backed

Evidence-backed: Company-reported gaps can be linked to who sits on the board. Using linked administrative data on 8,411 UK firms with at least 250 employees (2017-2021), a one-percentage-point increase in the female director share reduced the gender pay gap by 0.043 percentage points. Moving from the then-current UK average to board gender parity would close about one-sixth of the reported 9.7% pay gap. The effect operated through asymmetric wage increases favouring women, improved female representation across pay quartiles, and more equitable allocation of performance-related pay, and was concentrated in firms with 250-5,000 employees and strongest where UK nationals were a board majority.5

Evidence-backed

Evidence-backed: Gaps also interact with other identities. In a survey of National Health Service employees in England, findings revealed substantial heterogeneity within the LGB+ group, and disclosure of sexual identity was related to higher pay, arising from larger returns on the endowments of LGB+ employees — especially men.6

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What to remember

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  1. In the US in 2024, women earned as much as men unadjusted, narrowing to about 95% after controls.

  2. Decomposition studies often leave a large unexplained share — in a Togo poultry study — which authors attribute to likely wage discrimination.

  3. The gender pay gap is the average difference in remuneration between employed men and women; it is a workforce-level measure, not a same-job comparison.

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  1. 1
    Gender pay gap (Wikipedia)
    WikipediaPublished Oct 10, 2026Checked Oct 10, 2026
    “The gender pay gap or gender wage gap is the average difference between the remuneration for men and women who are employed. In most countries, women are paid less than men for the same work. non-adjusted pay gap is the average difference in yearly earnings between male and female workers adjusted pay gap is the difference between how much men and women make for the same work, and it takes into account differences in hours worked, occupations chosen, education attained, and job experience. The global unadjusted gender pay gap is 68.5%. Recently, the pay gap has decreased most rapidly in Global South developing countries. In the European Union, there has been little change in the gender pay gap in the 21st century. In 2024 in the United States, according to Pew Research, women earned 85% as much as men, slightly up from 81% in 2003. Developed Asian economies have also entered a stage of relative stability, yet income disparities remain relatively larger compared with those in Western economies. The adjusted gender pay gap is much smaller.”
  2. 2
    Gender pay gap in the United States (Wikipedia)
    WikipediaPublished Oct 6, 2026Checked Oct 10, 2026
    “The gender pay gap in the United States is a measure comparing the earnings of men and women in the workforce. According to Pew Research in 2024, women earned 85% as much as men, up from 81% in 2003. However when variables such as hours worked, occupations chosen, and education and job experience are controlled for, the gap diminishes with females earning 95% as much as males. The exact figure varies because different organizations use different methodologies to calculate the gap. The gap varies depending on industry and is influenced by factors such as race and age. The causes of the gender pay gap are debated, but popular explanations include the "motherhood penalty," hours worked, occupation chosen, willingness to negotiate salary, and gender bias.”
  3. 3
    Unpacking gender wage inequality in poultry farming: evidence from Togo through Oaxaca-Blinder analysis.
    Frontiers in sociology (Ihou et al.)Published Jun 29, 2026Checked Oct 10, 2026
    “This study investigates gender wage inequality in poultry industries, a relevant issue in the ongoing debates on workplace discrimination. The study used the Oaxaca-Blinder decomposition method to assess the portion of wage differences explained and unexplained. The methodology involves the collection of primary data from 200 employees across six prefectures in the Maritime region of Togo. The analysis reveals that 35.10% of the total wage gap is explained by differences in individual characteristics between genders, such as age, experience, and level of responsibility, while 64.90% of the gap remains unexplained. This unexplained portion is likely due to wage discrimination. These findings strengthen the hypothesis that wage discrimination is a major factor contributing to the observed wage gap. This study suggests that policies should still be combating this discrimination which is crucial for ensuring greater equity in the poultry sector and, more broadly, in other economic sectors.”
  4. 4
    Gender pay gaps in nursing and midwifery: Evidence from cross-country comparative analysis.
    International journal of nursing studies (Amo-Agyei & McIsaac)Published Jun 2, 2026Checked Oct 10, 2026
    “Distributional decompositions show that a substantial share of observed pay gaps remains unexplained by these characteristics in several countries, while regression analyses confirm statistically significant conditional pay gaps.ConclusionsGender pay gaps in nursing and midwifery are widespread but highly heterogeneous across countries. Raw pay gaps alone are insufficient for understanding inequality in these highly feminised occupations, underscoring the importance of robust, context-sensitive analytical approaches. Where pay gaps persist after adjustment, they point to structural and institutional factors related to wage-setting and progression. Addressing these disparities is essential not only for gender equality but also for the retention, motivation, and long-term resilience of the nursing and midwifery workforce and the health systems that depend on them.RegistrationNot registered.Social media abstractGender pay gaps in nursing and midwifery persist across 27 countries. Raw pay gaps often provide an incomplete picture, while adjusted analyses reveal substantial unexplained disparities, particularly in upper-middle- and high-income settings.”
  5. 5
    Mind the (gender pay) gap: the role of board gender composition.
    Journal of population economics (Galanakis & Gosling)Published Feb 21, 2026Checked Oct 10, 2026
    “We study how the share of female directors affects company-reported gender pay gaps using linked administrative data. We combine gender pay gap reports with proprietary board-composition data for 8,411 UK firms with at least 250 employees (2017-2021). Our identification uses a Bartik (1991)-style instrumental variable design that exploits regional shifts in female board representation. A one-percentage-point increase in the female director share reduces the gender pay gap by 0.043 percentage points. Moving from the current UK average to board gender parity would close about one-sixth of the reported 9.7% pay gap. The effect operates through three channels. Female directors generate asymmetric wage increases favouring women, improve female representation across pay quartiles, and ensure more equitable allocation of performance-related pay. Effects are concentrated in firms with 250-5,000 employees and are strongest when UK nationals comprise a board majority.Supplementary informationThe online version contains supplementary material available at 10.1007/s00148-026-01159-x.”
  6. 6
    Pay gaps in the National Health Service: Gender and sexuality.
    PloS one (Mumford et al.)Published Mar 4, 2026Checked Oct 10, 2026
    “Studies investigating the relationship between gender, sexual identity and pay have increased in number and scope over the last three decades, enabling a greater understanding of the outcomes facing LGB+ workers in the labour market. Pay gap studies that also allow for the disclosure of sexual identity in the workplace are, however, very rare. Using a rich survey of employees from the National Health Service in England, this article considers the relationship between relative pay, LGB+ identity, and disclosure for both men and women. While the findings reveal substantial heterogeneity within the LGB + , disclosure is shown to be related to higher pay from larger returns on the endowments of LGB+ employees (men or women), especially so for men.”

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  1. Version 2Oct 10, 2026Live now

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  • Why do headline global and national figures differ so much between sources, and which measure (unadjusted earnings ratio vs. percentage gap) is being reported in each case?

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  • How much of the unexplained residual in decomposition studies reflects discrimination versus unmeasured factors such as negotiation, career interruptions or firm-level wage-setting?

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  • How far do findings from single sectors or countries — UK large firms, nursing and midwifery, Togo poultry farming, the English NHS — generalise to other workforces?

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