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
135kg in Stone and Pounds — Is This a Healthy Weight?
135kg converts to 21 stone 4 pounds (21st 4lbs). Whether this is a healthy weight for you depends entirely on your height. Using NHS guidelines, the same weight can be healthy for one person and overweight for another. The key is calculating your BMI and comparing it to your height. Use our free BMI calculator above to check your personal BMI instantly, or read on to understand how your weight fits into UK health thresholds 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 at Different Heights
At 135kg (21st 4lbs), your health status depends on your height. Here are three concrete examples showing how the same weight can fall into different categories:
- At 5ft 10in (178cm): BMI is 19.3 — healthy weight range
- At 5ft 6in (168cm): BMI is 21.8 — healthy weight range
- At 5ft 2in (157cm): BMI is 29.0 — overweight (approaching obese)
To convert kilograms to stone accurately, use the standard conversion: divide kg by 6.35. At 135kg, you can verify your exact weight in stone and pounds using our weight converter on this page. Your BMI tells you whether 135kg is healthy for your height according to NHS guidelines, which define healthy BMI as 18.5 to 24.9 for most adults.
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
Check your waist measurement too — it's as important as weight. NHS guidelines recommend: men's waist under 94cm (37in), women's waist under 80cm (31.5in). If you're outside the healthy weight range for your height, small changes work. The NHS recommends losing 0.5–1kg per week for sustainable results. Your GP can assess your individual health and refer you to weight management support if needed. If you're trying to lose weight, track your progress with our free progress tracker to monitor your journey week by week.
- 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 135kg in stone and pounds?
135kg equals 21 stone and 4 pounds (21st 4lbs). To convert kilograms to stone, divide by 6.35. Multiply the decimal portion by 14 to get pounds. You can also use our free weight converter to switch between kg, stone, and lbs instantly.
Is 135kg a healthy weight?
It depends on your height. At 5ft 10in, 135kg is a healthy weight (BMI 19.3). At 5ft 6in, it's still healthy (BMI 21.8). At 5ft 2in, it's overweight (BMI 29.0). Use our free BMI calculator above to find your exact BMI and see where you fall on NHS guidelines.
What is the healthy weight range for my height?
NHS healthy BMI is 18.5 to 24.9. For a given height, multiply your height in metres squared by 18.5 and 24.9 to find your healthy weight range in kg. For example, at 5ft 8in (1.73m), healthy weight is 55–74kg. Your GP can advise your personal healthy weight target.
What should I do if 135kg is overweight for my height?
Talk to your GP about weight management support. The NHS recommends losing 0.5–1kg per week through a reduced-calorie diet and increased physical activity. Tier 3 specialist weight management services are available through the NHS. Even a 5–clinically studied weight loss improves health outcomes significantly.
How do I know if my weight is affecting my health?
Waist measurement matters as much as weight. If your waist is over 94cm (men) or 80cm (women), health risk increases regardless of BMI. Symptoms like breathlessness, joint pain, or sleep issues may signal weight-related health impacts. Your GP can assess your individual risk factors and 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.