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
122 Pounds in Kilograms — UK Health Context
122 pounds equals approximately 55.3 kilograms. Whether this is a healthy weight depends entirely on your height. For some adults, 55.3 kg falls comfortably in the healthy weight range; for others, it may be underweight or overweight. The NHS uses BMI (body mass index) as the primary screening tool to assess whether a weight is healthy for your height. Use our free BMI calculator above to check your personal BMI instantly, and see where your weight falls against NHS guidelines.
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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 by Height
To understand whether 122 pounds (55.3 kg) is healthy for you, compare it against the healthy weight range for your height. The NHS defines a healthy BMI as 18.5 to 24.9. Using the standard kilogram to stone conversion, 55.3 kg equals approximately 8 stone 9 pounds.
Three examples at different heights:
- At 5ft 2in (158cm): 55.3 kg gives a BMI of 22.1 — healthy range
- At 5ft 6in (168cm): 55.3 kg gives a BMI of 17.8 — underweight (below 18.5)
- At 5ft 0in (152cm): 55.3 kg gives a BMI of 23.9 — healthy range
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds — a healthy BMI starts at 18.5 but the overweight category begins at 23.0.
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 and What to Do Next
If your BMI falls outside the healthy range (18.5–24.9), the NHS recommends discussing your weight with your GP, who can provide personalised guidance based on your individual health and medical history. Waist circumference also matters: men should aim for under 94cm (37 inches), and women under 80cm (31.5 inches). If you're concerned about your weight or have existing health conditions, your GP can advise on appropriate support, including lifestyle changes or referral to specialist weight management services. Use the weight converter on this page to check your weight in stone and pounds alongside kg for easy reference.
- 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.
How do I convert 122 pounds to kilograms?
122 pounds equals 55.3 kilograms. The conversion formula is: pounds ÷ 2.20462 = kilograms. You can also use our free weight converter above for instant conversions between kg, stone, and pounds.
Is 122 pounds a healthy weight?
It depends on your height. At 5ft 2in, it's healthy (BMI 22.1). At 5ft 6in, it's underweight (BMI 17.8). Use our BMI calculator to find your personal BMI and see where you fall on the NHS healthy weight range for your height.
What does 122 pounds equal in stone?
122 pounds equals approximately 8 stone 9 pounds. To convert: divide pounds by 14 to get stone, or use our weight converter above for quick metric to imperial weight conversions.
What should I do if my weight is outside the healthy range?
Contact your GP for personalised advice. They can assess your individual health, discuss lifestyle changes like diet and exercise, and refer you to specialist weight management services if appropriate. Your GP will consider your overall health, not just weight alone.
Does waist measurement matter as much as weight?
Yes. The NHS recommends checking both BMI and waist circumference, as where fat is stored affects health risk. Men should aim for under 94cm, women under 80cm. Waist measurement is especially important if your BMI is borderline, as it provides additional health context.
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.