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 12 Lbs in Kilograms?
13 stone 12 pounds equals approximately 88.0 kilograms. This conversion uses the standard UK to metric formula: multiply stone by 6.35029 and pounds by 0.453592, then add together. At this weight, your health context depends on your height, age, and overall fitness. Use our free BMI calculator to check where you fall on the NHS health guide and see what healthy weight range means for your specific height.
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 12 Lbs to Kilograms
To convert 13 stone 12 lbs to kg, use this calculation:
- Stone to kg: 13 × 6.35029 = 82.55377 kg
- Pounds to kg: 12 × 0.453592 = 5.44310 kg
- Total: 82.55377 + 5.44310 = 87.99687 kg (rounded to 88.0 kg)
Our free weight converter above does this instantly for you — simply enter 13 stone 12 lbs and switch between kg, stone, and pounds. This conversion is exact and follows the standard metric formula used by NHS health services across the UK. Whether you're tracking weight for health reasons, comparing measurements with international standards, or checking your BMI, this conversion gives you the precise kilogram equivalent.
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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 88 Kg a Healthy Weight in the UK?
Whether 88 kg is healthy depends on your height. Using NHS guidelines, a person 5ft 10in (178cm) tall at 88 kg would have a BMI of approximately 31.7 — which falls into the obese category (BMI 30+). However, for someone 6ft 2in (188cm) tall, 88 kg gives a BMI of around 28.4 — which is overweight but not obese. For South Asian, Black African, or Chinese adults, NHS recommends lower thresholds. Your GP can discuss your personal health in context of your medical history, fitness level, and weight-related conditions. Try our weight converter and BMI calculator above to find your personal context.
- 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 many kilograms is 13 stone 12 pounds?
13 stone 12 lbs equals exactly 87.99687 kg, which rounds to 88.0 kg. Use the formula: (13 × 6.35029) + (12 × 0.453592) = 88.0 kg. Our free weight converter can do this calculation instantly.
Is 88 kg overweight or obese according to NHS guidelines?
At 88 kg, whether you're overweight or obese depends on your height. At 5ft 10in, this is obese (BMI 31.7). At 6ft 2in, it's overweight (BMI 28.4). Use our BMI calculator to find your personal BMI and NHS category.
What is the healthy weight range for someone who is 88 kg?
At 88 kg, you need to know your height to determine a healthy range. For example, at 5ft 8in, healthy weight is 55–74 kg. At 5ft 11in, it's 59–79 kg. Your GP can discuss what's right for you individually.
How do I convert stone and pounds to kilograms easily?
Multiply stone by 6.35029 and pounds by 0.453592, then add the results. Or use our free weight converter on this page — just enter your weight and switch between units instantly.
What if I need to lose weight from 88 kg?
NHS recommends losing 0.5–1 kg per week for sustainable results. Weight management involves reduced-calorie diet, increased physical activity, and lifestyle support. Your GP can discuss options including behaviour change programmes or, if eligible, weight management services in your area.
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.