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
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50kg in Stones and Pounds — Healthy Weight Guide
50kg is equal to 7 stone and 12.8 pounds (or approximately 7 stone 13 lbs). Whether this is a healthy weight depends entirely on your height. A weight that's healthy for one person may be overweight or underweight for another. Use our free BMI calculator above to check your personal healthy weight range, or read on to see examples for different heights and understand NHS weight guidance for UK adults.
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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.
Is 50kg a Healthy Weight? Height Examples
Whether 50kg is healthy depends on your height. The NHS uses BMI (body mass index) to assess healthy weight ranges, which accounts for both weight and height together. Here are three real-world examples:
- Person 5ft 2in (158cm): 50kg = BMI of 20 — healthy weight range ✓
- Person 5ft 6in (168cm): 50kg = BMI of 17.7 — underweight (below healthy range)
- Person 4ft 10in (147cm): 50kg = BMI of 23.4 — healthy weight range ✓
A healthy BMI for most UK adults is 18.5 to 24.9. To convert your weight between kilograms to stone using the standard metric to imperial weight conversion, try our free weight converter on this page. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a slightly lower healthy BMI range (18.5 to 22.9), as these groups face higher health risks at the same weight.
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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.
Healthy Weight Range by Height
Here's a quick table showing healthy weight ranges at common UK heights:
- 5ft 2in (158cm): 46.3–58.6 kg (7st 3lbs – 9st 3lbs)
- 5ft 4in (163cm): 49.2–62.2 kg (7st 10lbs – 9st 10lbs)
- 5ft 6in (168cm): 52.2–66.0 kg (8st 3lbs – 10st 5lbs)
- 5ft 8in (173cm): 55.4–70.1 kg (8st 10lbs – 11st 0lbs)
- 5ft 10in (178cm): 58.6–74.2 kg (9st 3lbs – 11st 8lbs)
If your weight falls outside the healthy range for your height, your GP can discuss personalised options with you. Small changes to diet and physical activity can make a meaningful difference, and evidence shows that losing just 5–10% of body weight can improve health outcomes including blood pressure, blood sugar, and cholesterol levels.
- 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 50kg in stones and pounds?
50kg equals 7 stone and 12.8 pounds (approximately 7 stone 13 lbs). To convert kilograms to stone, divide the kilogram weight by 6.35. You can also use our free weight converter above for instant conversions between kg, stone, and pounds.
Is 50kg healthy for my height?
It depends on your height. At 5ft 2in, 50kg is healthy. At 5ft 6in, it's underweight. Use our BMI calculator on this page to find your personal BMI and healthy weight range instantly based on your exact height.
What's the NHS healthy weight range?
According to NHS guidelines, a healthy BMI is 18.5 to 24.9 for most UK adults. For South Asian, Chinese, Black African, or Caribbean adults, the recommendation is 18.5 to 22.9 due to higher health risks at lower BMI levels.
What should I do if I'm outside the healthy weight range?
If your weight is outside the healthy range for your height, talk to your GP. Small lifestyle changes like increased physical activity and dietary adjustments can help. Your GP can discuss personalised options and support.
Is BMI the only measure of healthy weight?
BMI is a useful screening tool but has limitations — it doesn't account for muscle mass or where fat is stored. The NHS also recommends measuring waist circumference (healthy: under 80cm for women, under 94cm for men).
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.