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
Free tracker included with every download this week
What Does Weight Adjusted Mean for Your Health?
Weight adjusted refers to personalised health assessments that account for your individual circumstances—not just a single number on the scales. In the UK, the NHS uses weight adjustment as part of comprehensive health management, taking into account your height, age, ethnicity, and existing health conditions. Rather than relying on a rigid weight target, UK health guidance emphasises that your healthy weight range is unique to you. Your GP can help determine what weight adjusted approach is right for your specific situation, considering factors like muscle mass, metabolism, and overall wellbeing.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
How UK Health Services Use Weight Adjustment
The NHS recognises that a one-size-fits-all approach to weight doesn't work. Weight adjustment in UK healthcare means personalising health targets based on individual factors:
- Ethnicity-adjusted BMI thresholds: South Asian, Chinese, Black African, and Black Caribbean adults have lower BMI thresholds for health risk—the NHS recommends healthy BMI of 18.5–22.9 rather than the standard 18.5–24.9
- Age and metabolism: Older adults may have different healthy weight ranges due to natural muscle loss
- Health conditions: Existing conditions like type 2 diabetes or heart disease may influence what weight target is appropriate
- Lifestyle factors: Activity level, diet, and stress all affect what constitutes a healthy weight for you personally
Your GP can assess these factors during a health check and help you set realistic, adjusted weight goals. Use our free BMI calculator above to check where you currently fall, then discuss the results with your healthcare provider for personalised guidance.
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.
Setting Realistic, Adjusted Weight Goals
Rather than targeting a specific number, NHS weight management guidance recommends focusing on sustainable lifestyle changes that lead to gradual, healthy weight loss or maintenance. An adjusted approach means:
- Aiming for 0.5–1 kg loss per week, not rapid changes
- Building habits around nutrition and physical activity, not just hitting a target weight
- Monitoring how you feel—energy, sleep, mood—not just the scales
- Working with your GP to adjust targets if health conditions change
Our free weight converter helps you understand your weight in both metric and imperial measurements, making it easier to track progress in whatever units you prefer. Track your journey over time using our progress tracker to see real changes in your health and wellbeing.
- 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 does weight adjusted mean in NHS guidance?
Weight adjusted means personalising your health assessment based on your individual circumstances—ethnicity, age, health conditions, and lifestyle—rather than using a single standard for everyone. Your GP uses weight adjustment to set realistic, personalised health targets that account for these factors.
Are BMI thresholds different for different ethnic groups in the UK?
Yes. The NHS recommends lower BMI thresholds for South Asian, Chinese, Black African, and Black Caribbean adults because these groups face higher health risks at lower BMI levels. Standard healthy BMI is 18.5–24.9, but for these groups it's 18.5–22.9.
How much weight should I aim to lose per week in the UK?
The NHS recommends losing 0.5–1 kg per week for sustainable, healthy weight loss. Faster loss is possible with medical support, but slower loss is often more sustainable and preserves muscle mass.
Should I focus on a specific weight number or other health measures?
A weight-adjusted approach focuses on overall health improvement—energy levels, fitness, blood pressure, and how you feel—rather than just a number on the scales. Discuss with your GP what health markers matter most for your situation.
How can my GP help me with weight adjustment?
Your GP can assess your individual health factors, discuss any underlying conditions, recommend appropriate lifestyle changes or medical support, and help set realistic, personalised targets. They can also refer you to NHS weight management services if needed.
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.