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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What Does a BMI of 30 Mean for Men?
A BMI of 30 falls into the obese category according to NHS guidelines. For men, this BMI indicates that excess weight may begin to affect health outcomes, including increased risk of type 2 diabetes, high blood pressure, and cardiovascular disease. Using our free BMI calculator, you can check your personal BMI and see where you fall within the NHS categories. The good news is that even modest weight loss of 5–10% can improve health markers significantly. This guide explains what a BMI of 30 means, what causes it, and practical steps forward.
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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.
NHS BMI Categories and Where 30 Sits
According to NHS BMI categories for adults, a BMI of 30 is the threshold where a person moves from "overweight" into the "obese" category. Here's how the full range breaks down:
- Below 18.5 — underweight
- 18.5 to 24.9 — healthy weight
- 25.0 to 29.9 — overweight
- 30.0 to 34.9 — obese (Class I) ← A BMI of 30 sits here
- 35.0 to 39.9 — obese (Class II)
- 40.0 and above — severely obese (Class III)
For men of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds apply — obesity may begin at a BMI of 27.5 or higher, reflecting higher health risk at lower BMI levels in these populations. To find your exact BMI, use the BMI formula: weight in kg divided by height in metres squared. You can also calculate it instantly using our BMI calculator above.
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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.
BMI Limitations and What Else Matters
While BMI limitations are important to understand, BMI alone doesn't tell the complete health picture. A BMI of 30 doesn't account for muscle mass—athletes with high muscle may have a BMI of 30 but low body fat. Waist circumference is equally important: for men, a waist over 94cm (37 inches) indicates increased health risk, and over 102cm (40 inches) indicates high risk. If you have a BMI of 30, speak to your GP about your individual health profile, lifestyle, and any weight-related symptoms. They can assess whether weight loss is recommended and discuss support options including lifestyle changes, dietary approaches, or referral to specialist weight management services.
- 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.
Is a BMI of 30 considered obese?
Yes. According to NHS guidelines, a BMI of 30 marks the start of the obese category (Class I obesity). This does not mean serious health danger—many people with a BMI of 30 are otherwise healthy—but it does indicate increased risk for type 2 diabetes, heart disease, and high blood pressure compared to those with a healthy BMI.
What weight would be obese for a 5ft 10in man?
A man who is 5ft 10in (178cm) tall reaches a BMI of 30 at approximately 86kg (13 stone 8lbs). Use our weight converter to check exact conversions. Weight at BMI 25 (overweight threshold) is about 71kg, so the range between 71–86kg represents the overweight category for this height.
Can I lose weight with a BMI of 30?
Yes. The NHS recommends losing weight at a sustainable rate of 0.5–1kg per week. Even a 5–10% reduction in body weight can improve blood pressure, blood sugar control, and joint stress. Start with lifestyle changes: a 500 kcal daily deficit, increased physical activity, and dietary improvements. Your GP can discuss whether additional support or medication may help.
What are the health risks of a BMI of 30?
A BMI of 30 is associated with increased risk of type 2 diabetes, high blood pressure, abnormal cholesterol, cardiovascular disease, sleep apnoea, and some cancers. However, risk varies by waist circumference, fitness level, family history, and other factors. Your GP can assess your personal risk and recommend preventive steps.
Should I see my GP about a BMI of 30?
Yes. Your GP can review your overall health, discuss weight management options, and check for weight-related conditions like high blood pressure or prediabetes. If weight loss would benefit your health, they can discuss lifestyle support, NHS weight management programmes, or specialist referral. Early action often prevents serious health problems developing.
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.