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
M Kgs — Understanding Weight in UK Context
M kgs is a common measurement used in discussions about weight, health, and BMI across the UK. Whether you're tracking your weight, understanding NHS health guidance, or converting between metric and imperial measurements, this page provides you with the context you need. We'll help you understand what this weight means for your health using UK measurements, NHS guidance, and practical tools to support your wellbeing.
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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.
UK Weight Context and Conversions
In the UK, weight is typically expressed in stone and pounds for personal use, though the NHS uses kilograms for clinical measurements. M kgs converts to approximately M stone and X pounds using the standard conversion formula: divide kilograms by 6.35 to get stone. You can use our free weight converter above to instantly switch between kg, stone, and lbs. Understanding your weight in both metric and imperial units is helpful when consulting NHS guidance, discussing weight with your GP, or following UK-specific health advice. The NHS publishes healthy weight ranges based on BMI categories, which apply regardless of whether you measure in kg or stone. For most UK adults, a healthy weight falls within a BMI range of 18.5 to 24.9, though these thresholds vary for adults of South Asian, Chinese, Black African, or Black Caribbean heritage.
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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.
Using NHS Health Guidance and Tools
Your GP and NHS health guidance can help you understand whether your current weight is healthy for your age, height, and medical history. Use our free BMI calculator on this page to check where your weight sits within NHS BMI categories — it takes just seconds and gives you instant context. If you're managing your weight or considering lifestyle changes, the NHS recommends losing weight at a sustainable rate of 0.5 to 1 kg per week. If you're interested in prescription weight loss support, GLP-1 medications like Mounjaro and Wegovy are available through NHS specialist services or private prescribing, and eligibility is assessed individually. Your next step is always a conversation with your GP, who can discuss your personal health situation and recommend appropriate 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.
How do I convert M kgs to stone and pounds?
Divide M by 6.35 to get stone. For example, M kgs ÷ 6.35 = X stone. To find the additional pounds, multiply the decimal by 14. Our free weight converter above does this instantly — just enter your weight and it shows you the conversion in stone, pounds, and all other common units.
Is M kgs a healthy weight in the UK?
This depends on your height, age, and ethnicity. Use our BMI calculator to check your personal BMI against NHS healthy weight ranges. A healthy BMI is typically 18.5 to 24.9 for most adults, though lower thresholds apply for people of South Asian, Chinese, Black African, or Black Caribbean heritage. Your GP can give personalised advice.
What does the NHS say about weight management?
The NHS recommends sustainable weight loss of 0.5 to 1 kg per week alongside a reduced-calorie diet and increased physical activity. If you're overweight or obese (BMI 25 or above), your GP can discuss healthy weight targets and support options, including referral to specialist weight management services where available.
Should I be concerned about my weight at M kgs?
Weight alone isn't a complete picture of health. Your BMI, waist circumference, overall fitness, and medical history all matter. Use our BMI calculator above to get context, and discuss any concerns about your weight with your GP, who can assess your individual health situation.
What weight loss support is available in the UK?
The NHS offers tier 1–4 weight management services, from self-help tools to specialist services and bariatric surgery. Prescription options like GLP-1 medications (Mounjaro, Wegovy) are available through NHS specialist services or private prescribing following clinical assessment. Your GP can advise on what's suitable for you.
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.