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 BMI is 17.4kg in Stone?
17.4kg is approximately 2 stone 11 pounds in UK measurements. Your BMI at this weight depends entirely on your height — the same weight can fall into different NHS health categories depending on how tall you are. Below you'll find what BMI 17.4kg gives at various heights, and where each falls within NHS guidelines. Use our free BMI calculator above to enter your specific height and get your exact BMI instantly, along with your personalised healthy weight range.
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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.
17.4kg BMI at Different Heights
At 17.4kg, your BMI changes significantly based on your height. Here's how this weight converts across common adult heights:
- At 150cm (4ft 11in): BMI = 27.6 — falls in the overweight category according to NHS guidelines
- At 155cm (5ft 1in): BMI = 25.9 — still overweight, though closer to the healthy range
- At 160cm (5ft 3in): BMI = 23.8 — healthy weight range (18.5–24.9)
- At 165cm (5ft 5in): BMI = 23.1 — healthy weight
- At 170cm (5ft 7in): BMI = 22.4 — healthy weight
- At 175cm (5ft 9in): BMI = 21.8 — healthy weight
The key insight: at 17.4kg, only adults under approximately 155cm would fall outside the healthy weight range. Try the weight converter on this page to switch between kg, stone, and pounds instantly.
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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 uses five standard BMI categories: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25.0–29.9), obese (30.0–34.9), and severely obese (40.0+). However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes or very muscular individuals may have a high BMI despite low body fat. BMI also doesn't account for where fat is stored; waist measurement matters too. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds because these groups face higher health risks at the same BMI level. Your GP can provide personalised guidance about what your weight and BMI mean for your individual health.
- 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 17.4kg in stone and pounds?
17.4kg converts to 2 stone 11 pounds (or 2st 11lbs) in UK measurements. To convert kg to stone, divide by 6.35029. So 17.4 ÷ 6.35029 = 2.74 stone, which is 2 stone plus 0.74 × 14 pounds = 10.4 pounds, or approximately 2 stone 11 pounds.
Is 17.4kg a healthy weight?
That depends entirely on your height. At 17.4kg, someone who is 160cm (5ft 3in) tall would have a healthy BMI of 23.8. However, someone 150cm (4ft 11in) tall would have a BMI of 27.6, which falls in the overweight category. Use our BMI calculator to find your specific BMI and healthy weight range for your height.
What does BMI tell me about my health?
BMI is a useful screening tool that indicates whether your weight may be linked to increased health risks. However, it has limitations — it doesn't account for muscle mass, bone density, or fat distribution. A high BMI doesn't automatically mean poor health, and a normal BMI doesn't assures good health. Your GP can give you comprehensive health advice beyond BMI alone.
Are there different BMI categories for different ethnicities?
Yes. The NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, and Black Caribbean heritage because these groups have higher risks of type 2 diabetes and heart disease at lower BMI levels. Healthy weight for these groups typically starts at BMI 18.5–22.9 rather than 18.5–24.9.
How can I find my healthy weight range at my height?
Use our free BMI calculator above — enter your height and it will instantly show your healthy weight range in kg, stone, and pounds. The healthy weight range corresponds to a BMI of 18.5–24.9 (or 18.5–22.9 for South Asian and other specified backgrounds). Track your progress with our free progress tracker if you're working towards a health goal.
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.