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 13 Stone in Kilograms?
13 stone is equivalent to approximately 82.6 kilograms (or 182 pounds). In the UK, where stone and pounds remain the standard measurement for body weight, understanding how your weight converts to metric units is important for comparing health information and using NHS guidance. Whether you're checking your weight against NHS health thresholds or simply converting between UK and metric measurements, knowing your weight in kilograms helps you access the full range of UK health information and tools available to support your wellbeing.
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.
How Does 13 Stone Compare to UK Health Guidelines?
At 13 stone (82.6 kg), your health context depends entirely on your height and individual circumstances. Use our free BMI calculator above to determine your personal BMI, which is the NHS's primary screening tool for healthy weight ranges. For most adults, a BMI of 18.5 to 24.9 is considered healthy; 25 to 29.9 is overweight; and 30 or above is obese according to NHS guidelines.
If you are 5ft 8in (173 cm) tall, for example, 13 stone gives a BMI of approximately 31.4, which falls into the obese category. However, if you are 6ft 2in (188 cm) tall, the same weight gives a BMI of around 26.5, which is overweight. Your individual health risk depends on your height, age, medical history, and where your body stores fat. NHS guidance also recommends measuring your waist circumference: for men, over 94 cm (37 inches) indicates increased risk; for women, over 80 cm (31.5 inches) indicates increased risk.
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.
Managing Weight and Accessing NHS Support in the UK
If you're concerned about your weight or health, your GP is your first point of contact. NHS weight management services are organised into four tiers: tier 1 includes self-help and digital tools like our free weight converter and progress tracker; tier 2 offers behaviour change programmes; tier 3 provides specialist multidisciplinary services; and tier 4 covers bariatric surgery for severe obesity with significant health complications.
Even a 5 to 10 percent reduction in body weight can meaningfully improve health outcomes including blood pressure, blood sugar control, and cholesterol levels. Sustainable weight loss of 0.5 to 1 kg per week is recommended by the NHS. Your GP can discuss realistic goals, support options, and whether prescription weight loss medications like GLP-1 injections (Mounjaro or Wegovy) might be appropriate for your circumstances.
- 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 13 stone in kilograms exactly?
13 stone equals 82.556 kilograms (or approximately 82.6 kg). To convert, multiply stone by 6.35029. Use our free weight converter above to switch between stone, pounds, and kilograms instantly.
Is 13 stone a healthy weight?
It depends on your height. Calculate your BMI using our free calculator above to find out. At 13 stone, if you're taller you may be in a healthy range; if you're shorter you may be overweight or obese according to NHS guidelines. Height is crucial.
How much would I need to lose from 13 stone to reach a healthy weight?
This depends on your height and target BMI. For a person 5ft 6in tall, healthy BMI (18.5–24.9) corresponds to roughly 7st 7lb to 9st 10lb. Your GP can help you set a realistic, personalised target based on your individual health.
What NHS support is available if I weigh 13 stone and want to lose weight?
Contact your GP to discuss tier 1 self-help tools, behaviour change programmes, or referral to specialist tier 3 weight management services if eligible. Your GP can assess your health and discuss whether prescription weight loss medications are suitable for you.
How do I track progress if I'm starting from 13 stone?
Use our free progress tracker to log your weight regularly and monitor trends over time. Track alongside lifestyle changes like increased physical activity and reduced calorie intake for sustainable results.
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.