{"id":50,"date":"2026-08-07T17:34:29","date_gmt":"2026-08-07T17:34:29","guid":{"rendered":"https:\/\/smallhrtools.com\/blog\/?p=50"},"modified":"2026-10-16T22:13:33","modified_gmt":"2026-10-16T22:13:33","slug":"bradford-factor-explained-trigger-points","status":"publish","type":"post","link":"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/","title":{"rendered":"The Bradford Factor Explained: Formula, Trigger Points, and Fair Use"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#The_formula_and_why_spells_are_squared\" >The formula, and why spells are squared<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#Three_employees_same_total_days_wildly_different_scores\" >Three employees, same total days, wildly different scores<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#Standard_trigger_bands\" >Standard trigger bands<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#Where_the_Bradford_Factor_goes_wrong\" >Where the Bradford Factor goes wrong<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#A_sane_small-business_policy_in_five_lines\" >A sane small-business policy in five lines<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#Frequently_Asked_Questions_%E2%80%93_FAQs\" >Frequently Asked Questions &#8211; FAQs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#Is_a_half-day_a_spell\" >Is a half-day a spell?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#Does_approved_leave_count\" >Does approved leave count?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#Two_spells_separated_by_a_weekend\" >Two spells separated by a weekend?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/smallhrtools.com\/blog\/bradford-factor-explained-trigger-points\/#Whats_a_%E2%80%9Cgood%E2%80%9D_average_score\" >What&#8217;s a &#8220;good&#8221; average score?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\"><strong>Short answer:<\/strong> the Bradford Factor scores absence as <strong>S\u00b2 \u00d7 D<\/strong> &#8211; the number of separate absence <em>spells<\/em> squared, times total <em>days<\/em> absent. Squaring the spells makes ten one-day absences score <strong>1,000<\/strong> while a single ten-day illness scores just <strong>10<\/strong>, deliberately flagging the frequent-short-absence pattern that disrupts teams most and correlates strongest with disengagement. Used with judgment and clear trigger bands, it&#8217;s a genuinely useful early-warning signal. Used as an automatic disciplinary tripwire, it&#8217;s a lawsuit and a morale problem. This post covers both halves.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_formula_and_why_spells_are_squared\"><\/span>The formula, and why spells are squared<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Bradford Factor = S\u00b2 \u00d7 D<\/strong><\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">S = number of separate absence spells in the period (usually a rolling 52 weeks)<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">D = total days absent across those spells<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">A &#8220;spell&#8221; is one continuous absence, whatever its length: out Monday-Wednesday with flu is one spell, three days. The squaring is the whole point of the metric &#8211; it encodes the operational reality that <strong>frequency hurts more than duration<\/strong>. One planned two-week absence can be covered; ten unpredictable Mondays cannot. Cover is arranged eleven times, work is re-planned eleven times, and the team absorbs the uncertainty every week.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Three_employees_same_total_days_wildly_different_scores\"><\/span>Three employees, same total days, wildly different scores<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">All three missed <strong>10 working days<\/strong> in the last 12 months:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Employee<\/th><th>Pattern<\/th><th>S<\/th><th>D<\/th><th>Score<\/th><\/tr><\/thead><tbody><tr><td>Asha<\/td><td>One surgery, 10 consecutive days<\/td><td>1<\/td><td>10<\/td><td>1\u00b2 \u00d7 10 = <strong>10<\/strong><\/td><\/tr><tr><td>Ben<\/td><td>Two flu bouts, 5 days each<\/td><td>2<\/td><td>10<\/td><td>2\u00b2 \u00d7 10 = <strong>40<\/strong><\/td><\/tr><tr><td>Chirag<\/td><td>Ten separate single days, mostly Mondays<\/td><td>10<\/td><td>10<\/td><td>10\u00b2 \u00d7 10 = <strong>1,000<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Same absenteeism <em>rate<\/em> &#8211; a plain rate calculation treats them identically (which is why you track both; the <a href=\"https:\/\/smallhrtools.com\/tools\/absenteeism-rate-calculator\/\">Absenteeism Rate Calculator<\/a> computes rate and Bradford Factor side by side). The Bradford lens says: Asha needs a get-well card and a phased return; Ben is unremarkable; Chirag&#8217;s pattern needs a conversation &#8211; this month, not at the annual review.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Bradford_Factor_absence_score-1024x572.jpg\" alt=\"Bradford Factor Absence Score\" class=\"wp-image-296\" srcset=\"https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Bradford_Factor_absence_score-1024x572.jpg 1024w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Bradford_Factor_absence_score-767x428.jpg 767w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Bradford_Factor_absence_score-300x167.jpg 300w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Bradford_Factor_absence_score.jpg 1376w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Standard_trigger_bands\"><\/span>Standard trigger bands<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Most organisations that use the Bradford Factor adopt bands like these (calibrate to your own workforce before adopting):<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Score<\/th><th>Typical response<\/th><\/tr><\/thead><tbody><tr><td>0-49<\/td><td>No action &#8211; normal life happens<\/td><\/tr><tr><td>50-199<\/td><td>Informal, supportive check-in: &#8220;I noticed a pattern &#8211; is everything OK?&#8221;<\/td><\/tr><tr><td>200-399<\/td><td>Formal review meeting; attendance expectations documented<\/td><\/tr><tr><td>400-499<\/td><td>Written warning territory; occupational-health referral considered<\/td><\/tr><tr><td>500+<\/td><td>Final warning \/ disciplinary process<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Two calibration notes. First, run the numbers on your current workforce <em>before<\/em> setting bands &#8211; in a customer-facing shift environment a 50 threshold might flag a third of your staff; in a small office it might flag no one for years. Second, use a <strong>rolling 52-week window<\/strong>, not the calendar year: a fixed January reset lets a December pattern vanish, and invites exactly the wrong kind of gaming.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Infographic_showing_Bradford_Factor-1024x572.jpg\" alt=\"Infographic Showing Bradford Factor\" class=\"wp-image-298\" srcset=\"https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Infographic_showing_Bradford_Factor-1024x572.jpg 1024w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Infographic_showing_Bradford_Factor-300x167.jpg 300w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Infographic_showing_Bradford_Factor-767x428.jpg 767w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Infographic_showing_Bradford_Factor.jpg 1376w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_the_Bradford_Factor_goes_wrong\"><\/span>Where the Bradford Factor goes wrong<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The metric has well-documented failure modes, and every one of them comes from removing human judgment:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Disability and chronic illness.<\/strong> Conditions like asthma, migraine, epilepsy, or chemotherapy cycles produce exactly the frequent-short-spell pattern the formula punishes. In the UK, disciplining on an unadjusted score can constitute disability discrimination under the Equality Act &#8211; the standard adjustment is discounting disability-related absences from the count or raising the individual&#8217;s trigger. Wherever you operate, the principle holds: <strong>medical patterns need accommodation, not arithmetic.<\/strong><\/li>\n\n\n\n<li><strong>Pregnancy-related absence<\/strong> must be excluded outright in most jurisdictions.<\/li>\n\n\n\n<li><strong>Presenteeism.<\/strong> A hard trigger teaches people to come in sick &#8211; infecting the team and converting short absences into long ones. If scores drop but your <a href=\"https:\/\/smallhrtools.com\/tools\/absenteeism-rate-calculator\/\">absenteeism rate<\/a> later spikes, that&#8217;s the mechanism.<\/li>\n\n\n\n<li><strong>It measures pattern, not cause.<\/strong> A rising score under one specific manager, or clustered in one team, is telling you about the manager or the workload &#8211; the same diagnostic logic as <a href=\"https:\/\/smallhrtools.com\/blog\/real-cost-of-employee-turnover-worked-model\/\">turnover clustering<\/a>. Score first, ask why second.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"A_sane_small-business_policy_in_five_lines\"><\/span>A sane small-business policy in five lines<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Track S and D per employee over a rolling 52 weeks; compute the score monthly.<\/li>\n\n\n\n<li>Use the 50 threshold as a <strong>conversation<\/strong> trigger, never an automatic sanction.<\/li>\n\n\n\n<li>Discount disability-, pregnancy-, and statutory-leave-related absences before scoring.<\/li>\n\n\n\n<li>Pair the score with the plain absenteeism rate &#8211; one catches pattern, the other catches volume.<\/li>\n\n\n\n<li>Publish the policy. A scoring system employees discover <em>after<\/em> being disciplined by it destroys trust permanently.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Fair-use_policy_infographic_layout-1024x572.jpg\" alt=\"Fair Use Policy Infographic Layout\" class=\"wp-image-300\" srcset=\"https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Fair-use_policy_infographic_layout-1024x572.jpg 1024w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Fair-use_policy_infographic_layout-300x167.jpg 300w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Fair-use_policy_infographic_layout-767x428.jpg 767w, https:\/\/smallhrtools.com\/blog\/wp-content\/uploads\/2026\/08\/Fair-use_policy_infographic_layout.jpg 1376w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_%E2%80%93_FAQs\"><\/span>Frequently Asked Questions &#8211; FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-question-1792188765994\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"Is_a_half-day_a_spell\"><\/span><strong>Is a half-day a spell?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Count it consistently &#8211; most policies treat any absence within one day as one spell with D = 0.5 or 1. Consistency matters more than the convention.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1792188775921\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"Does_approved_leave_count\"><\/span><strong>Does approved leave count?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>No. Planned holiday, parental leave, jury duty, and approved medical leave are excluded. The Bradford Factor is for <em>unplanned<\/em> absence only.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1792188786332\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"Two_spells_separated_by_a_weekend\"><\/span><strong>Two spells separated by a weekend?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>If the employee was absent Friday and again Monday for the same illness, most policies count one continuous spell. Different causes, two spells.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1792188798177\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"Whats_a_%E2%80%9Cgood%E2%80%9D_average_score\"><\/span><strong>What&#8217;s a &#8220;good&#8221; average score?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Below ~30 as a workforce average is unremarkable. But the metric is designed for individual patterns, not averages &#8211; a team mean hides the one 900 it exists to find.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Related: the <a href=\"https:\/\/smallhrtools.com\/tools\/absenteeism-rate-calculator\/\">Absenteeism Rate Calculator<\/a> computes both the absenteeism rate and Bradford Factor from the same inputs, with the productivity-cost impact. Policy thresholds here are common practice, not legal advice &#8211; check employment law in your jurisdiction before disciplining on any absence score.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Short answer: the Bradford Factor scores absence as S\u00b2 \u00d7 D &#8211; the number of separate absence spells squared, times total days absent. Squaring the spells makes ten one-day absences score 1,000 while a single ten-day illness scores just 10, deliberately flagging the frequent-short-absence pattern that disrupts teams most and correlates strongest with disengagement. Used [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":63,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides"],"_links":{"self":[{"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/posts\/50","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/comments?post=50"}],"version-history":[{"count":8,"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/posts\/50\/revisions"}],"predecessor-version":[{"id":303,"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/posts\/50\/revisions\/303"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/media\/63"}],"wp:attachment":[{"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/media?parent=50"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/categories?post=50"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/smallhrtools.com\/blog\/wp-json\/wp\/v2\/tags?post=50"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}