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 Is Average Weight In Kg For UK Adults?
The average weight in kg varies significantly by height, age, and individual health. For UK adults, the NHS defines "healthy weight" not by an absolute number, but by your personal BMI (Body Mass Index) — a ratio of your weight to your height. According to the most recent data, the average UK adult man weighs approximately 85.7 kg (13st 7lbs), whilst the average UK adult woman weighs approximately 71.6 kg (11st 3lbs). However, average does not mean healthy or ideal — your ideal body weight depends entirely on your height and individual health profile.
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.
Understanding Healthy Weight Range In Kg Using BMI
The NHS defines a healthy weight using BMI (Body Mass Index), which ranges from 18.5 to 24.9 kg/m². This framework is much more useful than a single "average" figure because it accounts for your height. To calculate your personal healthy weight range in kg:
- Lower bound: 18.5 × (height in metres)²
- Upper bound: 24.9 × (height in metres)²
For example, an adult who is 1.73m tall (5ft 8in) has a healthy weight range of approximately 55–75 kg (8st 10lbs to 11st 10lbs). Use our free BMI calculator above to enter your own height and instantly see your personal healthy weight range in kg and stone. It's important to note that ethnicity matters — for adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds (18.5–22.9), meaning the healthy weight range for the same height would be slightly lower.
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.
How To Find Your Ideal Weight For Height
Your ideal weight in kg depends on your height, age, frame size, and muscle mass. Rather than chasing an "average" figure, use the NHS healthy weight range as your framework. Enter your height into our free BMI calculator on this page to see the exact kg range that's healthy for you. Once you know your current weight and healthy range, the next step is understanding whether you're within, above, or below that range. If you'd like to explore how weight loss medication might support your goals, our free GLP-1 weight loss calculator can help you estimate potential outcomes if you're eligible for prescription weight loss treatment. Remember, sustainable weight changes are built on gradual progress — aim for losing no more than 0.5–1 kg per week.
- 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 the average weight in kg for a UK adult?
The average UK adult man weighs approximately 85.7 kg (13st 7lbs), and the average UK adult woman weighs approximately 71.6 kg (11st 3lbs). However, "average" does not mean healthy — your ideal weight depends on your height and BMI, not on population averages. Use the BMI calculator to find your personal healthy weight range.
How do I calculate my healthy weight range in kg?
Your healthy weight range in kg is determined by your BMI. Multiply your height in metres by itself, then multiply by 18.5 for the lower bound and 24.9 for the upper bound. For example, at 1.75m tall, your healthy range is roughly 56–76 kg. Our BMI calculator does this instantly — just enter your height above.
Is 70kg a healthy weight?
Whether 70kg is healthy depends entirely on your height. At 1.75m (5ft 9in), 70kg gives a BMI of 22.9, which is in the healthy range. At 1.60m (5ft 3in), 70kg gives a BMI of 27.3, which is overweight. Use our BMI calculator to check your personal result.
What's the difference between average weight and ideal weight?
Average weight is what most people weigh — but it doesn't reflect what's healthy for your body. Ideal or healthy weight is based on your BMI and height according to NHS guidelines. Many UK adults are above the healthy weight range, so the average is higher than the ideal for good health.
Do different ethnic backgrounds have different healthy weights?
Yes. The NHS recommends lower BMI thresholds for South Asian, Chinese, Black African, and Black Caribbean adults (18.5–22.9) compared to other groups (18.5–24.9). This is because these populations face higher health risks at lower BMI levels. Our BMI calculator can account for ethnicity — check the options on the tool.
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.