Norton Scale Calculator — Pressure Ulcer Risk Assessment

How to Use This Calculator

1. Rate each of the 5 Norton subscales based on clinical assessment.
2. Total Norton score (5–20) and risk tier appear instantly.
3. Use the Risk Tiers tab for setting-specific prevention bundle recommendations.
4. Use the Norton vs Braden tab to compare both tools side-by-side.
5. Use the Professional tier for setting-specific reassessment frequency guidance.

Formula

Example

Frequently Asked Questions

• What is the Norton Scale? ▼
  The Norton Scale is one of the earliest validated clinical tools for assessing a patient's risk of developing pressure ulcers (also called pressure injuries or decubitus ulcers). It was developed by Doreen Norton at St Pancras Hospital in London, published in 1962 in the book "An Investigation of Geriatric Nursing Problems in Hospital." The scale assesses five domains: physical condition (general health status, rated 1–4 from very bad to good), mental condition (alertness and orientation, rated 1–4 from stuporous to alert), activity (degree of physical movement outside bed, rated 1–4 from bedfast to ambulant), mobility (ability to change and control body position, rated 1–4 from immobile to full mobility), and incontinence (urinary and faecal, rated 1–4 from doubly incontinent to not incontinent). Total scores range from 5 (highest risk) to 20 (lowest risk), with lower scores indicating greater pressure injury risk — the inverse of many other clinical tools. A score of 14 or below is generally considered the threshold identifying patients at risk, while scores of 12 or below indicate high risk requiring aggressive prevention. The Norton Scale was designed specifically for elderly patients in long-term care and geriatric settings.
• How does the Norton Scale compare to the Braden Scale? ▼
  The Norton Scale (1962) and Braden Scale (1987) are the two most widely researched pressure injury risk assessment tools. Both use five to six subscales scored 1–4 and produce an inverse score where lower numbers indicate higher risk, though the Norton total ranges 5–20 and Braden 6–23. The key conceptual difference is in subscale selection: Norton uses "physical condition" and "mental condition" — broad, somewhat vague constructs — while Braden replaced these with more mechanistically specific subscales: sensory perception (ability to feel and respond to pressure discomfort), moisture (skin exposure to moisture from incontinence and perspiration), and nutrition (food intake and nutritional status). These Braden-specific subscales represent direct risk pathways for tissue breakdown, giving the Braden Scale a stronger conceptual foundation and generally higher sensitivity in comparative studies. Multiple systematic reviews (including a Cochrane review) have found that Braden outperforms Norton in predictive validity, particularly in acute hospital settings. However, Norton performs similarly to Braden in long-term care and has the advantage of being faster to complete. The EPUAP/NPUAP 2019 international guidelines acknowledge both tools as validated options, recommending that facilities select the tool most appropriate to their setting and staff training.
• Why does a lower Norton score mean higher risk? ▼
  The Norton Scale is an inverse scoring scale: each subscale awards higher points for better function and lower points for greater impairment. A patient who is ambulant, alert, continent, and in good physical and mental condition scores 4 on each of the five subscales for a total of 20 — the maximum score, indicating minimal risk. A patient who is bedfast (activity 1), immobile (mobility 1), stuporous (mental condition 1), in very poor physical condition (physical condition 1), and doubly incontinent (incontinence 1) scores 1 on all five subscales for a total of 5 — the minimum score, indicating maximum risk. This inverse relationship is initially counterintuitive compared to risk scales such as the Wells Score for DVT (where higher scores mean higher risk), but is consistent with how the Braden Scale also works — higher Braden scores indicate better function and lower risk. The clinical implication is straightforward: any Norton score at or below 14 should trigger a formal pressure injury prevention plan, with increasing urgency as the score decreases. Scores of 12 or below correspond to high or very high risk and require the most intensive prevention bundles.
• When was the Norton Scale developed and what was the original context? ▼
  The Norton Scale was developed during a research study conducted at St Pancras Hospital in London in the late 1950s to early 1960s, led by Doreen Norton with colleagues Ruth McLaren and A.N. Exton-Smith. The research was published in the 1962 Royal College of Nursing report "An Investigation of Geriatric Nursing Problems in Hospital." The original research was prompted by concern about the high incidence of pressure sores in elderly hospitalised patients and the lack of any systematic risk identification method. Norton and her team studied 250 geriatric patients over two years, systematically recording five patient characteristics and tracking pressure sore development. The resulting five-factor scale was derived empirically from this observational study. The threshold of ≤14 indicating risk was originally set at ≤12 by Norton herself, then adjusted upward to ≤14 in subsequent clinical practice as users found the 12-cutoff left too many at-risk patients unidentified. The scale was adopted internationally through the 1960s–1980s, particularly in the UK and Europe, before the Braden Scale emerged as a more rigorously validated alternative. Despite being over 60 years old, the Norton Scale remains in active use in many long-term care facilities and is referenced in NPUAP/EPUAP international pressure injury guidelines.
• Should I use Norton or Braden in my facility? ▼
  The choice between Norton and Braden should be based on your clinical setting, patient population, staff familiarity, and any regulatory or accreditation requirements specific to your jurisdiction. In the United States, The Joint Commission and CMS do not mandate a specific scale but require documented pressure injury risk assessment; most US hospitals and nursing homes use Braden because it has been more extensively validated in acute care settings and is the tool most commonly required in nursing education curricula. In the United Kingdom, the Waterlow Score (1985, 20-item scale with additional risk factors) is required by many NHS Trusts, though Norton is also widely used in long-term and community settings. In Canada and Australia, Braden predominates. For geriatric and long-term care settings where the original Norton validation was performed, Norton remains appropriate and may be preferred for its simplicity and speed. The EPUAP/NPUAP/PPPIA international guidelines (2019) state that institutions should select a validated risk assessment tool appropriate to their patient population, ensure staff are trained in its use, and combine formal tool scores with clinical judgment — no single tool is sufficient without holistic assessment. Reliability depends more on consistent application and staff training than on the specific tool chosen.

Related Calculators