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
Is 12.7 Stone In Lbs A Healthy Weight?
12.7 stone in pounds is 177.8 lbs — but whether this weight is healthy for you depends entirely on your height. The NHS uses BMI (Body Mass Index) to assess whether a weight falls within a healthy range, and the same weight can be perfectly healthy for one person and overweight for another depending on how tall they are. Use our free BMI calculator above to find out if your weight is in the healthy range for your height, or read on for guidance on healthy weight ranges across different heights.
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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.
Healthy Weight Ranges At Different Heights
To understand if 12.7 stone (177.8 lbs) is healthy for you, you need to know your height. The NHS defines a healthy weight using BMI categories: a BMI between 18.5 and 24.9 is considered healthy weight. Here's how 12.7 stone compares across common heights:
- At 5ft 2in (157cm): BMI would be 29.1 — overweight range
- At 5ft 7in (170cm): BMI would be 24.8 — healthy weight range
- At 5ft 11in (180cm): BMI would be 21.7 — healthy weight range
As you can see, the same weight can fall in different BMI categories depending on height. This shows why BMI alone matters — but remember, BMI has limitations and doesn't account for muscle mass or where fat is stored. Use our weight converter to check your weight in kg or stone and pounds, then use the BMI calculator on this page to find your personal BMI result.
Clinically BackedWeight Loss
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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 Guidance: Next Steps For Your Health
If your BMI falls outside the healthy 18.5–24.9 range, the NHS recommends speaking with your GP, who can assess your individual health and discuss next steps. Waist measurement is also important: men should aim for under 94cm (37in), and women under 80cm (31.5in). Weight is influenced by many factors including genetics, medical conditions, and lifestyle, so there's no shame in seeking support. If you're working towards a weight goal, our free progress tracker can help you log and monitor changes over time.
- 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 12.7 stone in kilograms?
12.7 stone equals approximately 80.6 kg. To convert stone to kilograms, multiply the stone weight by 6.35029. You can use our free weight converter above to instantly convert between stone, pounds, and kilograms.
Is 12.7 stone overweight for a woman?
It depends on height. At 5ft 7in, 12.7 stone gives a BMI of 24.8 (healthy). At 5ft 2in, it's 29.1 (overweight). Use our BMI calculator to check your personal result based on your exact height.
What's my healthy weight range?
Your healthy weight range depends on your height. Use the BMI calculator on this page to find your healthy weight range. Alternatively, your GP can discuss healthy weight targets specific to your health profile and any medical conditions you have.
Should I see my GP about my weight?
If your BMI is outside 18.5–24.9, or if you have concerns about your weight and health, speaking with your GP is a good step. They can assess your individual circumstances and discuss support options including lifestyle changes or, if appropriate, specialist referral.
How accurate is BMI?
BMI is a useful screening tool but has limitations — it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. Waist measurement and overall health markers are also important. Your GP can provide personalised health advice beyond BMI alone.
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.