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
What's 137kg in Stone and What BMI Does It Give?
137kg converts to approximately 21 stone 8 pounds in UK measurements. However, your BMI at this weight depends entirely on your height — the same weight can fall into different NHS categories depending on how tall you are. Using our free BMI calculator, you can instantly discover your personal BMI and see which NHS weight category applies to you. This guide shows you what 137kg means for your health at five different heights, helping you understand your individual health context.
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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.
137kg BMI at Different Heights
At 137kg, your BMI varies significantly based on your height. Here's what this weight gives you at common adult heights:
- 163cm (5ft 4in): BMI 51.5 — severely obese (Class III)
- 168cm (5ft 6in): BMI 48.6 — severely obese (Class III)
- 173cm (5ft 8in): BMI 45.8 — severely obese (Class III)
- 178cm (5ft 10in): BMI 43.2 — severely obese (Class III)
- 183cm (6ft): BMI 40.9 — severely obese (Class III)
- 188cm (6ft 2in): BMI 38.7 — obese (Class II)
The weight-to-height conversion shows that at 137kg, most adults would fall into the severely obese or Class II obese category. A prescriber assessing eligibility for weight loss support would consider not just BMI but also your height, health conditions, and individual circumstances.
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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.
Understanding BMI Categories and Limitations
The NHS defines healthy BMI as 18.5 to 24.9, while 30 and above is classified as obese. However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes may have high BMI despite low body fat. BMI also doesn't account for where fat is stored, which matters for health risk.
Adults with a BMI above 30, or 27–29.9 with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea), may be eligible for prescription weight loss support through the NHS or private assessment. Use our free weight converter and BMI calculator above to track your progress and understand your personal health numbers.
- 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 137kg in stone and pounds?
137kg converts to 21 stone 8 pounds (21st 8lbs) in UK measurements. To break this down: multiply 137 by 0.157473 to get stone, or use our free weight converter above for instant conversions between kg, stone, and pounds.
Is 137kg a healthy weight?
At 137kg, whether your weight is healthy depends on your height and individual health factors. Your BMI at this weight ranges from approximately 38.7 to 51.5 depending on height. A GP or prescriber can assess whether your weight poses health risks and discuss support options with you.
What health conditions are linked to this weight?
At 137kg, excess weight increases risk of type 2 diabetes, high blood pressure, heart disease, sleep apnoea, and joint problems. However, individual health risk depends on your height, age, genetics, and whether you have existing health conditions. Your GP can offer personalised guidance.
How much weight would I need to lose to reach a healthy BMI?
To reach healthy BMI (18.5–24.9) at different heights, you'd need to lose roughly: 40–50kg at 163cm, 35–45kg at 173cm, or 30–40kg at 183cm. These are approximate targets — your GP can discuss realistic, sustainable weight loss goals based on your personal circumstances.
Where can I get help with weight management at this weight?
Contact your GP to discuss weight management support. You may be eligible for NHS specialist weight management services (tier 3), lifestyle support, or prescription medications like Mounjaro or Wegovy if appropriate. Private online prescribing is also available following a clinical assessment with a UK-licensed prescriber.
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.