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
12.9 Stone in Pounds — Is This a Healthy Weight?
12.9 stone is equal to 180.6 pounds. Whether this weight is healthy depends entirely on your height, age, and individual health factors. Using NHS guidelines, a weight of 12.9 stone (180.6 lbs) could be healthy for taller adults, but overweight for shorter individuals. This guide shows you how to check your personal BMI and what the NHS recommends for healthy weight ranges across different heights.
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 12.9 Stone
At 12.9 stone (180.6 lbs), your weight status depends on your height. To convert kilograms to stone and understand where you sit, you need to calculate your BMI. Here are three real-world examples:
- 5ft 6in (168cm): BMI of 29.2 — falls in the overweight category. A healthy weight range at this height is 8st 6lbs to 11st 4lbs (54–72 kg).
- 5ft 10in (178cm): BMI of 25.9 — falls in the overweight category, just above the healthy range. Healthy weight range is 9st 4lbs to 12st 7lbs (59–80 kg).
- 6ft 2in (188cm): BMI of 23.2 — falls in the healthy weight range. At this height, 12.9 stone sits comfortably within NHS guidelines of 10st 2lbs to 13st 8lbs (65–87 kg).
Use our free BMI calculator above to instantly calculate your personal BMI and see exactly where your weight sits on the NHS healthy weight scale.
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 What to Do Next
The NHS recommends a healthy BMI between 18.5 and 24.9 for most UK adults. If your BMI falls outside this range at 12.9 stone, this doesn't mean you're unhealthy — BMI is a screening tool with limitations and doesn't account for muscle mass or where fat is stored. Waist circumference also matters: for men, over 94cm (37in) indicates increased health risk; for women, over 80cm (31.5in) signals increased risk. If you're concerned about your weight or health, speak with your GP who can give personalised advice based on your full health picture and recommend support if needed.
- 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 12.9 stone in kilograms?
12.9 stone equals approximately 82 kg. To convert stone and pounds to kg, multiply stone by 6.35029 and pounds by 0.453592. Our free weight converter above can do this instantly for you.
Is 12.9 stone overweight or healthy?
It depends on your height. At 5ft 10in, 12.9 stone is overweight (BMI 25.9). At 6ft 2in, it's healthy (BMI 23.2). Use the BMI calculator on this page to check your personal result.
What's the healthy weight range for my height?
Healthy BMI is 18.5–24.9 for most adults. For your specific height, calculate the range by multiplying your height in metres squared by 18.5 and 24.9. Our BMI calculator does this automatically above.
If 12.9 stone is outside my healthy range, what should I do?
Speak with your GP for personalised advice. They can assess your overall health and, if appropriate, suggest evidence-based approaches like dietary changes, increased physical activity, or specialist support through NHS weight management services.
Does BMI tell the whole story about weight and health?
No. BMI doesn't distinguish between muscle and fat, doesn't account for where fat is stored, and varies by ethnicity. Waist measurement and overall fitness are also important. Your GP can help interpret your BMI in the context of your individual health.
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.