The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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MUST Scoring Calculator — UK Health Guide
The MUST (Malnutrition Universal Screening Tool) is an NHS-recommended scoring system used by UK healthcare professionals to assess malnutrition risk in adults. This free, evidence-based tool helps GPs, dietitians, and hospital staff identify patients who may benefit from nutritional support or dietary intervention. Understanding your MUST score is an important part of overall health management alongside weight monitoring and healthy weight maintenance.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
What Is MUST and How Does It Work?
MUST (Malnutrition Universal Screening Tool) is a validated screening system developed by the British Association for Parenteral and Enteral Nutrition (BAPEN) and endorsed by NHS England. It assesses malnutrition risk by evaluating three key factors: current weight status (BMI), unintentional weight loss, and acute illness impact.
- BMI calculation forms the foundation — similar to how our free BMI calculator works, MUST uses your weight and height to determine baseline nutritional status
- Recent weight loss history (over 3–6 months) indicates metabolic stress
- Acute illness assessment considers whether current health conditions affect nutritional needs
Each factor receives a score, and the total determines overall malnutrition risk (low, medium, or high). Healthcare professionals use MUST results to recommend dietary support, supplements, or referral to a dietitian.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
MUST Scoring in UK Healthcare Settings
In the UK, MUST screening is standard practice in NHS hospitals, GP surgeries, care homes, and community health services. The tool is particularly important for identifying vulnerable populations — elderly patients, those with chronic conditions, post-surgery patients, and people with significant unintentional weight loss.
Your GP or healthcare provider may calculate your MUST score as part of routine health assessment. If you're concerned about unintentional weight changes or nutritional status, ask your GP for a MUST assessment. Combining MUST evaluation with regular weight monitoring using our free weight converter ensures you have a complete picture of your nutritional health and can make informed decisions about dietary and lifestyle support.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
What's the difference between MUST scoring and BMI?
BMI measures weight relative to height and is one component of MUST scoring. However, MUST is more comprehensive — it also accounts for unintentional weight loss and acute illness, making it a better malnutrition risk tool. BMI alone doesn't capture nutritional vulnerability. Use our free BMI calculator alongside MUST assessment for complete health context.
Who should have a MUST assessment in the UK?
NHS guidance recommends MUST screening for all hospital inpatients on admission, care home residents, patients with chronic conditions, elderly adults, and anyone with unintentional weight loss. Your GP may arrange MUST screening if you report significant weight changes or health concerns. Regular screening is especially important during illness or major life changes.
Can I calculate my own MUST score?
While you can gather the necessary measurements (weight, height, recent weight loss), MUST interpretation requires clinical judgment. Healthcare professionals assess acute illness factors and determine appropriate intervention. Ask your GP, dietitian, or health visitor to calculate and interpret your MUST score as part of professional assessment.
What happens if my MUST score indicates high malnutrition risk?
High MUST scores trigger NHS referral pathways — typically to a registered dietitian or nutritionist. Your healthcare provider may recommend dietary supplements, food fortification, increased calorie intake, or monitoring. Treatment is tailored to your specific situation and underlying cause of malnutrition risk.
How does MUST scoring relate to healthy weight management?
MUST assesses malnutrition risk, while healthy weight is about maintaining a balanced BMI and nutritional status. Both matter for health. If you're trying to understand your weight or health position, use our free weight converter and BMI calculator to establish your baseline, then discuss MUST screening with your GP if you have concerns about weight loss or nutrition.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.