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
12.5 Stone in Lbs — Is This a Healthy Weight for You?
12.5 stone is equivalent to 175 pounds. However, whether this weight is healthy for you depends entirely on your height. The NHS uses BMI to assess weight health, 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 check your personal BMI instantly, and discover where your weight sits on the NHS health scale. This guide shows you three realistic examples so you can see how height makes all the difference.
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 12.5 stone (175 lbs), whether you're at a healthy weight depends on your height. The NHS recommends a healthy BMI between 18.5 and 24.9. Here's how 12.5 stone translates across different heights:
- At 5ft 4in (163cm): BMI of 30 — this falls into the obese category. Healthy weight range is 8st 4lbs to 11st 3lbs.
- At 5ft 8in (173cm): BMI of 26.6 — this is overweight. Healthy weight range is 9st 2lbs to 12st 5lbs.
- At 5ft 11in (180cm): BMI of 24.4 — this is within the healthy weight range. Healthy weight range is 10st 0lbs to 13st 5lbs.
Use our free weight converter above to check other weight conversions, and try the BMI calculator to find your exact personal BMI and healthy range.
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
If your weight at 12.5 stone falls outside your healthy range, the NHS recommends losing weight at a safe rate of 0.5 to 1 kg per week through a reduced-calorie diet and increased physical activity. Waist measurement is also important — even at the same weight, where you carry fat matters for health. Men should aim for under 94cm (37 inches) and women under 80cm (31.5 inches). If you're concerned about your weight or health, speak to your GP, who can give personalised advice and discuss options like referral to a specialist weight management service or whether prescription support might be appropriate for you.
- 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 12.5 stone in kilograms?
12.5 stone equals approximately 79.4 kg. To convert stone to kilograms, multiply by 6.35. You can use our weight converter above to switch between kg, stone, and pounds instantly.
Is 12.5 stone overweight?
It depends on your height. At 5ft 8in, 12.5 stone (BMI 26.6) is overweight. At 5ft 11in, it's within the healthy range. Use our free BMI calculator to check your personal result.
What is the healthy weight range at my height?
Healthy weight ranges vary by height. The NHS recommends a BMI between 18.5 and 24.9. Your GP or the BMI calculator on this page can help you find your individual healthy weight range.
How much weight would I need to lose to reach a healthy BMI?
This depends on your height and current BMI. If you're at 12.5 stone and overweight, losing 5–10% of your body weight can bring real health benefits. Speak to your GP about a safe, sustainable plan.
Can I use weight alone to assess my health?
No. While weight matters, waist circumference is equally important — it shows where fat is stored, which affects health risk. Your GP can assess your overall health picture, not just weight 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.