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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12.8 Stone in Lbs — Healthy Weight Guide for UK Adults
12.8 stone is equivalent to 179.2 pounds (lbs). However, whether this weight is healthy depends entirely on your height. Using NHS guidelines, the same weight can be healthy for a taller person but overweight for someone shorter. Our free BMI calculator above will show you instantly where your weight sits against NHS health thresholds. This guide explains healthy weight ranges by height and what the NHS recommends for adults in the UK.
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.
Healthy Weight Ranges by Height at 12.8 Stone
At 12.8 stone (179.2 lbs or approximately 81 kg), whether you're at a healthy weight depends on your height. The NHS uses BMI to assess this—a calculation based on your weight and height together. Here are three realistic examples showing how the same weight produces different health categories:
- 5ft 10in (178cm): BMI 25.7 — falls into the overweight category (NHS threshold: 25.0+)
- 5ft 11in (180cm): BMI 25.1 — just entering overweight range
- 6ft 2in (188cm): BMI 23.0 — healthy weight range (18.5–24.9)
To find your exact BMI, use the BMI calculator on this page—it takes just seconds and accounts for your specific height. You can also convert between stone and kg using our weight converter to see how this measurement works across different unit systems.
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.
NHS Guidance and Next Steps if You're Outside Healthy Range
The NHS recommends a healthy BMI between 18.5 and 24.9 for most adults. If your BMI at 12.8 stone places you in the overweight or obese category, the good news is that even a modest 5–10% reduction in body weight can improve health markers like blood pressure, cholesterol, and blood sugar control.
Beyond BMI, the NHS also recommends checking your waist circumference: men should aim for under 94cm (37in), women under 80cm (31.5in). If you're concerned about your weight or health, your GP can provide personalised advice tailored to your individual circumstances, medical history, and goals. They can also discuss safe, sustainable approaches to weight management.
- 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 is 12.8 stone in lbs exactly?
12.8 stone equals 179.2 pounds (lbs). To convert stone to pounds, multiply the stone figure by 14—since one stone is exactly 14 pounds. You can also use our free weight converter to switch between stone, lbs, and kg instantly.
Is 12.8 stone a healthy weight?
It depends on your height. At 12.8 stone, someone 6ft 2in tall may be at a healthy weight, whilst someone 5ft 6in might be overweight. Use our BMI calculator above to check your personal result based on your exact height and weight.
How do I know if I'm a healthy weight for my height?
The NHS uses BMI as the main screening tool. A healthy BMI is between 18.5 and 24.9. However, BMI has limitations—it doesn't distinguish between muscle and fat. Your GP can also assess your waist circumference and overall health context for a complete picture.
What should I do if I'm above my healthy weight range?
The NHS recommends gradual weight loss of 0.5–1 kg per week through a modest calorie deficit combined with increased physical activity. Even losing 5–10% of your body weight can improve health markers. Speak with your GP about approaches suited to your circumstances.
How do I convert between stone, lbs, and kg?
One stone equals 14 lbs exactly, and one stone equals 6.35 kg. So 12.8 stone = 179.2 lbs or approximately 81 kg. For quick conversions, use our free weight converter on this page—it handles all unit switches 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.