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
Is 16.8 Kg (37 Pounds) a Healthy Weight?
16.8 kg converts to approximately 37 pounds — but whether this is a healthy weight depends entirely on your height. A weight that's healthy for a child or petite adult may be underweight for someone taller. The NHS uses BMI (body mass index) as the primary screening tool to determine if a weight falls within a healthy range for your individual height. Use our free BMI calculator above to check your personal BMI instantly, and see where you sit on the NHS healthy weight scale.
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 by Height
To understand if 16.8 kg is healthy for you, calculate your BMI using your exact height and weight. The NHS BMI categories are: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25–29.9), and obese (30 and above). For example, 16.8 kg would be severely underweight for a typical adult — it's actually closer to the weight of a young child or newborn. If you're an adult weighing 16.8 kg, this would require urgent medical attention as it indicates severe malnutrition or an underlying health condition.
For context, here are healthy weight ranges for common UK heights using standard kilogram to stone conversion:
- 160 cm (5ft 3in): Healthy range 47–63 kg (7st 5lbs – 9st 13lbs)
- 170 cm (5ft 7in): Healthy range 53–71 kg (8st 5lbs – 11st 2lbs)
- 180 cm (5ft 11in): Healthy range 60–80 kg (9st 6lbs – 12st 8lbs)
16.8 kg is well below all these ranges and would require medical investigation if this were an adult's actual weight.
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.
Understanding Your Weight Context
If you're using 16.8 kg as a reference point, remember that healthy weight depends on multiple factors: your height, age, sex, muscle mass, and overall health. The NHS recommends discussing your weight with your GP if you're concerned about whether it's healthy for you. Waist circumference also matters — even at a healthy BMI, excess fat around the middle (over 94 cm for men, 80 cm for women) indicates increased health risk.
Our free weight converter above lets you switch between kilograms, stone, and pounds instantly. If you're tracking your own weight or someone else's, use the BMI calculator to get a full health context, and speak to your GP about any concerns. Weight health isn't just a number — it's about feeling well and managing any underlying conditions.
- 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 does 16.8 kg equal in stone and pounds?
16.8 kg equals 2 stone 10 pounds (2st 10lbs). To convert kilograms to stone, divide by 6.35029. To convert to just pounds, multiply by 2.20462, which gives approximately 37 pounds. Our weight converter makes these calculations instant.
Is 16.8 kg a healthy weight for an adult?
No — 16.8 kg is dangerously underweight for any adult. This weight would typically only be seen in newborns or very young children. If an adult weighs this amount, seek immediate medical attention from your GP, as it indicates severe malnutrition or serious underlying health conditions requiring urgent care.
How do I know if my weight is healthy?
Use the NHS BMI calculator to check your personal BMI based on your height and weight. A healthy BMI is 18.5–24.9. For South Asian, Black African, and Black Caribbean adults, healthy ranges are slightly lower at 18.5–22.9. Your GP can also assess your individual health context beyond just BMI.
What should I do if my weight is outside the healthy range?
Contact your GP for personalised advice. They can assess whether your weight poses health risks and discuss options including nutrition support, lifestyle changes, or referral to specialist services if needed. Never try crash dieting without medical guidance — sustainable weight management involves balanced nutrition and gradual change.
Does waist measurement matter as much as overall weight?
Yes — the NHS emphasises both BMI and waist circumference. Even at a healthy BMI, excess abdominal fat increases cardiovascular and diabetes risk. Healthy waist limits are under 94 cm for men and 80 cm for women. Ask your GP to measure yours if you're concerned about your health risk profile.
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.