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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16.8 kg to lbs — BMI at Different Heights
16.8 kg converts to 37.04 pounds (lbs). However, your BMI depends on your height — the same weight gives very different BMI results depending on how tall you are. This guide shows you what BMI 16.8 kg represents at common UK adult heights, and where you fall within NHS weight categories. Use our free BMI calculator above to check your personal BMI instantly based on your exact height and weight.
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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.
BMI at 16.8 kg — Examples by Height
At 16.8 kg, your BMI varies significantly depending on your height. Here are typical examples:
- 160 cm (5ft 3in): BMI = 6.6 — Severely underweight (NHS category below 18.5)
- 165 cm (5ft 5in): BMI = 6.2 — Severely underweight
- 170 cm (5ft 7in): BMI = 5.8 — Severely underweight
- 175 cm (5ft 9in): BMI = 5.5 — Severely underweight
- 180 cm (5ft 11in): BMI = 5.2 — Severely underweight
At this weight, regardless of height, you would fall well below the NHS healthy weight range (BMI 18.5–24.9). If you are 16.8 kg, it's important to discuss your weight with your GP, as being significantly underweight carries health risks including weak bones, low immunity, and nutritional deficiency.
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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 BMI Categories & When to Seek Support
The NHS classifies BMI below 18.5 as underweight, which includes being severely underweight as shown above. At 16.8 kg, you would need to gain significant weight to reach the healthy range. BMI limitations: it doesn't account for muscle mass, age, or body composition, but it's a useful screening tool. If you're at 16.8 kg, your GP can assess your individual health, check for underlying causes (medical conditions, eating disorders, medication effects), and recommend appropriate support. Track progress towards a healthier weight using our free progress tracker.
- 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 16.8 kg in pounds (lbs)?
16.8 kg equals 37.04 lbs. To convert kg to pounds, multiply by 2.20462. You can also use our free weight converter above to switch between kg, stone, and pounds instantly.
Is 16.8 kg underweight?
Yes, 16.8 kg is severely underweight for any adult. A healthy weight range depends on your height, but the NHS healthy BMI range (18.5–24.9) means adults should weigh significantly more. Your GP can advise on healthy weight targets for your individual height.
What is the healthy weight range for my height?
Use our free BMI calculator above to enter your height — it will show your healthy weight range instantly. For example, a person who is 170 cm tall has a healthy weight range of approximately 53–72 kg (8st 5lbs to 11st 5lbs).
Should I be concerned about being 16.8 kg?
Yes, being 16.8 kg is significantly below healthy weight for adults and carries health risks. Discuss this with your GP urgently. They can investigate causes and recommend appropriate support including nutritional advice or specialist referral if needed.
How do I convert 16.8 kg to stone and pounds?
16.8 kg equals approximately 2 stone 9 lbs. To convert kg to stone, divide by 6.35029. Our free weight converter makes this calculation instant — use it above to convert between metric and imperial measurements.
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.