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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308 Pounds to Kg — What BMI Does This Give?
308 pounds equals approximately 139.7 kilograms. However, your BMI — and what this weight means for your health — depends on your height. This guide shows you what BMI 308 pounds gives at common UK heights, which NHS category you fall into, and how to use this information. Use our free BMI calculator above to find your exact BMI instantly if you know your height.
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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.
308 Pounds in Kg at Different Heights — BMI Examples
308 pounds converts to 139.7 kg using the standard conversion: 1 pound = 0.453592 kg. Your BMI at this weight depends entirely on your height. Here are BMI values at common UK heights:
- 5ft 4in (163cm): BMI of 38.9 — Obese (Class II)
- 5ft 6in (168cm): BMI of 37.0 — Obese (Class II)
- 5ft 8in (173cm): BMI of 35.2 — Obese (Class II)
- 5ft 10in (178cm): BMI of 33.5 — Obese (Class I)
- 6ft 0in (183cm): BMI of 31.9 — Obese (Class I)
- 6ft 2in (188cm): BMI of 30.5 — Obese (Class I)
At 308 pounds across these heights, you fall into the obese category according to NHS guidelines. To convert kilograms to stone if you prefer imperial measurements, 139.7 kg equals approximately 22 stone. Your GP can provide personalised advice about what your weight means for your individual health.
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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.
NHS BMI Categories and What They Mean
The NHS defines BMI categories as follows: a healthy BMI is 18.5 to 24.9, overweight is 25.0 to 29.9, and obese ranges from 30.0 upwards. At 308 pounds (139.7 kg), most adults fall into the obese category, which carries increased health risks including type 2 diabetes, cardiovascular disease, and high blood pressure. However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes may have high BMI despite low body fat. For people of South Asian, Chinese, Black African, or Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risks at the same weight. Calculate your personal BMI using the weight converter and BMI calculator on this page to see where you stand and discuss next steps with your GP.
- 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 308 pounds to kilograms exactly?
Multiply 308 by 0.453592. This gives 139.7 kg. This is the precise metric conversion used by NHS weight charts and health professionals in the UK.
What does a BMI of 35–38 mean for my health?
A BMI in this range is classified as Obese (Class I or II) by the NHS. It indicates increased risk of type 2 diabetes, heart disease, and joint problems. Your GP can discuss weight management strategies tailored to your health.
Does 308 pounds mean I need weight loss treatment?
At 308 pounds, your GP may discuss weight management options with you. Treatment depends on your height, health conditions, and personal circumstances. Some people are eligible for NHS specialist weight management services or prescription medication.
Is BMI the only measure of health at 308 pounds?
No. BMI is useful but has limitations — it doesn't measure body fat directly or account for muscle mass. Waist circumference is also important: over 94cm (37in) for men or 80cm (31.5in) for women indicates increased health risk.
Can I convert 308 pounds to stone instead of kilograms?
Yes. 308 pounds equals approximately 22 stone (or 22 stone 0 pounds). You can use the weight converter on this page to switch between kg, stone, and pounds instantly.
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.