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
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What's 56.6kg in Stone and What Does It Mean for Your BMI?
56.6kg equals approximately 8 stone 12.8 pounds (or 8st 12lbs rounded). However, your BMI—the key health indicator—depends entirely on your height. At the same weight of 56.6kg, a taller person will have a lower BMI than a shorter person. Use our free BMI calculator above to find your exact BMI instantly, then check where you fall on the NHS weight categories. We've also included example BMI values across different heights below so you can see how this weight translates to health outcomes for UK adults.
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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.
56.6kg BMI at Different Heights — NHS Categories
At 56.6kg, your BMI varies significantly depending on your height. Here are typical examples:
- 5ft 0in (152cm): BMI = 24.6 — Healthy weight (NHS category: 18.5–24.9)
- 5ft 2in (157cm): BMI = 22.9 — Healthy weight
- 5ft 4in (163cm): BMI = 21.3 — Healthy weight
- 5ft 6in (168cm): BMI = 20.0 — Healthy weight
- 5ft 8in (173cm): BMI = 18.9 — Healthy weight
- 5ft 10in (178cm): BMI = 17.8 — Underweight (NHS category: below 18.5)
At 56.6kg, most UK adults fall comfortably within the healthy weight range for their height. If you're shorter (under 5ft 2in), you may be near the upper boundary of healthy weight, while taller adults will be well within healthy limits. Use the weight converter on this page to confirm your exact measurements in 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.
Understanding NHS BMI Categories and What They Mean
The NHS divides adults into five BMI categories based on health risk. A BMI between 18.5 and 24.9 is considered healthy weight with the lowest health risks. BMI of 25.0–29.9 is overweight, 30.0–34.9 is obese (Class I), and higher ranges carry progressively greater health risks including type 2 diabetes, heart disease, and high blood pressure.
It's important to note that BMI has limitations—it doesn't account for muscle mass, bone density, or where fat is stored. Athletes may have high BMI despite low body fat. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds because these groups face higher health risks at the same BMI level. Your GP can provide personalised weight and health advice.
- 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 56.6kg to stone and pounds exactly?
56.6kg converts to 8 stone 12.8 pounds (or 8st 13lbs when rounded). The conversion uses the formula: divide kg by 6.35029 to get stone. For precise conversions between kg, stone, and lbs, use our free weight converter above.
Is 56.6kg a healthy weight?
Whether 56.6kg is healthy depends entirely on your height. At most UK adult heights above 5ft 2in, this weight falls within the NHS healthy BMI range (18.5–24.9). Shorter individuals may be near the upper boundary. Calculate your personal BMI using our free BMI calculator on this page to know for certain.
What BMI does 56.6kg give at 5ft 6in?
At 5ft 6in (168cm), a weight of 56.6kg gives a BMI of 20.0, which is solidly within the healthy weight range according to NHS guidelines (18.5–24.9). This indicates low health risk related to weight.
Does muscle mass affect BMI at 56.6kg?
Yes—BMI doesn't distinguish between muscle and fat. Two people weighing 56.6kg at the same height can have very different body compositions. BMI is a screening tool only. Your GP can assess body composition and overall health alongside BMI for a complete picture.
What if I'm of South Asian or Black African heritage—does my BMI threshold change?
Yes. The NHS recommends lower BMI thresholds for people of South Asian, Chinese, Black African, and Black Caribbean backgrounds because they face higher health risks at the same BMI level. For these groups, a BMI of 23.0–27.4 is considered overweight rather than healthy weight. Discuss this with your GP if applicable to you.
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.