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 83.3kg a Healthy Weight?
83.3kg equals 13 stone 1 pound — but whether this is a healthy weight depends entirely on your height. The NHS uses BMI (body mass index) to determine if a weight falls in the healthy range, and healthy weight varies significantly from person to person. Using our free BMI calculator above, you can check exactly where your weight sits and what it means for your health. This guide shows you how to interpret your weight in the context of NHS guidelines.
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
At 83.3kg (13st 1lb), your healthy weight status depends on your height. Use our weight converter to check different heights, or refer to these NHS healthy weight ranges:
- At 160cm (5ft 3in): healthy weight is 47–64kg (7st 5lb–10st 1lb). 83.3kg is above this range.
- At 170cm (5ft 7in): healthy weight is 53–71kg (8st 5lb–11st 2lb). 83.3kg is above this range.
- At 180cm (5ft 11in): healthy weight is 60–80kg (9st 6lb–12st 8lb). 83.3kg is just above this range.
- At 190cm (6ft 3in): healthy weight is 67–89kg (10st 8lb–14st 0lb). 83.3kg falls within this range.
Calculate your personal BMI instantly using the calculator on this page to see your exact status.
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.
What to Do If Your Weight Is Outside the Healthy Range
If 83.3kg is above the healthy range for your height, the NHS recommends a gradual approach. Losing just 5–10% of body weight can bring real health benefits, including lower blood pressure and improved blood sugar control. Sustainable weight loss is typically 0.5–1kg per week, achieved through a balanced diet and increased physical activity. Your GP can assess your individual health picture and discuss options, which may include lifestyle support or — if appropriate — prescription weight loss treatment alongside diet and exercise changes.
- 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 83.3kg in stone and pounds?
83.3kg converts to 13 stone 1 pound (13st 1lb). Use our free weight converter above to switch between kilograms, stone, and pounds instantly. The conversion uses the standard factor: 1 stone = 6.35kg.
How do I know if 83.3kg is healthy for me?
Your healthy weight depends on your height. Calculate your BMI using the free BMI calculator on this page — it will instantly show you whether 83.3kg is in the healthy range for your height according to NHS guidelines. Healthy BMI is 18.5–24.9.
What's my healthy weight range if I'm 175cm tall?
At 175cm (5ft 9in), a healthy weight is approximately 57–76kg (8st 13lb–11st 13lb). At 83.3kg, this would be slightly above the healthy range. Your GP can discuss whether weight loss would be beneficial for your health.
Can I lose weight gradually and safely?
Yes. The NHS recommends losing 0.5–1kg per week through a combination of reduced calories and increased activity. Even losing 5–10% of your body weight brings measurable health benefits. Our free progress tracker can help you log and monitor your weight loss journey.
What should I do if I want to lose weight?
Start by speaking to your GP, who can assess your individual health and discuss options. These may include NHS weight management programmes, lifestyle changes, or referral to specialist services. Your GP can help you set realistic goals and provide the right support for your situation.
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.