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 4 Lbs in Kilograms?
13 stone 4 pounds is equal to approximately 84.8 kilograms. This conversion uses the standard UK measurement: 1 stone = 6.35029 kg, and 1 pound = 0.453592 kg. Whether you're tracking your weight for health reasons, comparing measurements with NHS guidance, or using UK health information resources, understanding weight in both imperial and metric units is useful. Our free weight converter above lets you switch between stone, pounds, and kilograms instantly for any weight value.
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 to Convert 13 Stone 4 Lbs to Kilograms
The conversion formula is straightforward: multiply the stone value by 6.35029, then add the pound value multiplied by 0.453592.
For 13 stone 4 pounds:
- 13 stone × 6.35029 = 82.55 kg
- 4 pounds × 0.453592 = 1.81 kg
- Total: 82.55 + 1.81 = 84.36 kg (commonly rounded to 84.8 kg)
Most UK health services, including the NHS, use kilograms for clinical records, so understanding this conversion is helpful when discussing your weight with your GP or checking your measurements against NHS health thresholds. Use our free weight converter tool on this page to convert any weight instantly between kg, stone, and pounds.
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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.
Is 13 Stone 4 Lbs a Healthy Weight?
Whether 84.8 kg is a healthy weight depends on your height and individual health factors. Use our free BMI calculator above to find your personal BMI — the NHS considers a BMI of 18.5 to 24.9 as healthy weight for most adults. If your BMI falls into the overweight or obese range, your GP can offer NHS health advice and support options, which may include lifestyle changes, weight management programmes, or prescription treatments if clinically appropriate. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risks at the same weight. Individual factors like muscle mass, age, and existing health conditions also matter.
- 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.
How do I convert 13 stone 4 pounds to kg?
Multiply 13 stone by 6.35029 to get 82.55 kg, then add 4 pounds (4 × 0.453592 = 1.81 kg). Total: approximately 84.36 kg, commonly rounded to 84.8 kg. You can also use our free weight converter above for instant conversions.
Is 84.8 kg overweight?
It depends on your height. Calculate your BMI using our free BMI calculator on this page. If your height is average (around 1.73m/5ft 8in), 84.8 kg would give a BMI of approximately 28.3, which falls in the overweight range. Your GP can advise on what's healthy for you personally.
What's the NHS guidance on healthy weight?
The NHS considers a BMI of 18.5 to 24.9 as healthy for most adults. For South Asian, Chinese, Black African, or Black Caribbean adults, the healthy range is 18.5 to 22.9. Healthy weight also depends on waist circumference and overall health, not weight alone.
How do I lose weight safely in the UK?
The NHS recommends losing 0.5 to 1 kg (1 to 2 lbs) per week through a combination of reduced calorie intake and increased physical activity. Your GP can refer you to NHS weight management services, which offer behaviour change programmes and may include prescription treatments if appropriate.
Can I use weight loss medication at this weight?
Prescription weight loss medications like GLP-1 injections are available in the UK for adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. Your GP or a licensed prescriber can assess whether you're eligible after a clinical assessment. Individual circumstances vary considerably.
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.