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 Is B Am M in UK Health?
B Am M is an abbreviation sometimes used in online health discussions, though it's not standard NHS terminology. If you're asking about your personal health metrics—particularly your blood pressure, BMI, or weight management—this guide explains what matters for your wellbeing in the UK context. Understanding your health numbers, including your BMI and weight status, helps you and your GP make informed decisions about your health. Use our free BMI calculator above to check where you currently stand, and continue reading to understand what these measurements mean for your health.
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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.
Understanding Key UK Health Metrics
In UK health guidance, several key measurements matter for your overall wellbeing. BMI (Body Mass Index) is calculated from your weight and height, and the NHS uses standard categories: a healthy BMI is between 18.5 and 24.9 for most adults. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds—healthy weight starts at a BMI of 18.5 and goes up to 22.9.
Blood pressure (often written as systolic/diastolic, e.g., 120/80) is also important for assessing heart health. The NHS considers a reading below 120/80 mmHg ideal for most adults. Weight and BMI can influence blood pressure, which is why healthy weight management is often recommended alongside other lifestyle changes.
Our free weight converter helps you understand your weight across kg, stone, and pounds—the measurements commonly used in UK health services. Using the BMI calculator and weight converter on this page gives you a clear picture of where you stand against NHS healthy weight guidelines.
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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.
When to Discuss Your Health with Your GP
If you're concerned about your weight, blood pressure, or any other aspect of your health, your GP is the best starting point. They can assess your individual situation, take your full medical history, and recommend appropriate next steps—whether that's lifestyle changes, monitoring, or specialist referral.
If your BMI falls outside the healthy range, or if you have questions about weight management options, NHS specialist weight management services (tier 3) can offer evidence-based support. Some adults may be eligible for prescription weight loss medications through these services. A GP assessment is always the first step to understand your options and what might be suitable for your individual health needs.
- 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 a healthy BMI look like in the UK?
According to NHS guidelines, a healthy BMI is 18.5–24.9 for most UK adults. However, the NHS recommends lower thresholds for adults of South Asian, Chinese, Black African, or Black Caribbean heritage—18.5–22.9. Use our BMI calculator above to check your personal BMI instantly and see where you fall.
How can I convert my weight to check against NHS healthy weight guidelines?
Use our free weight converter on this page to instantly convert between kg, stone, and pounds. Once you have your weight in the right units and your height, the BMI calculator will show you your BMI category according to NHS standards and what healthy weight range applies to your height.
What's the difference between blood pressure and BMI?
BMI measures body weight relative to height and is used to screen for weight-related health risks. Blood pressure measures the force of blood against artery walls and is a key cardiovascular health indicator. Both matter for overall health, and healthy weight can help manage blood pressure naturally.
Should I see my GP if my BMI is outside the healthy range?
Yes—your GP can assess your individual health, discuss any concerns, and recommend appropriate support. This might include lifestyle advice, monitoring, or referral to specialist weight management services. NHS guidance emphasises a personalised approach based on your full health picture, not BMI alone.
Are there prescription weight loss options available on the NHS in the UK?
Yes, prescription weight loss medications like Mounjaro and Wegovy are available through NHS specialist tier 3 weight management services for eligible adults. Access and availability vary by region. Your GP can assess your eligibility and discuss whether specialist referral is appropriate for your situation.
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.