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 BMI Does 5.8 Kg Give You?
5.8 kg converts to approximately 12.8 lbs. However, your BMI depends entirely on your height — the same weight produces very different BMI results for different people. This guide shows you what BMI 5.8 kg gives at typical UK heights, and where each falls within NHS weight categories. Use our free BMI calculator above to find your exact BMI instantly, or read on for example BMI values across different heights.
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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.
5.8 Kg BMI at Different Heights
At 5.8 kg, your BMI varies significantly depending on your height. Here are BMI examples at typical adult heights:
- 150 cm (4ft 11in): BMI = 25.8 (Overweight category)
- 160 cm (5ft 3in): BMI = 22.7 (Healthy weight)
- 170 cm (5ft 7in): BMI = 20.1 (Healthy weight)
- 175 cm (5ft 9in): BMI = 18.9 (Healthy weight)
- 180 cm (5ft 11in): BMI = 17.9 (Healthy weight)
- 190 cm (6ft 3in): BMI = 16.0 (Underweight)
To convert 5.8 kg to stone and pounds using standard metric to imperial weight conversion, this is approximately 0 stone and 12.8 lbs. For larger measurements, you can use our weight converter to switch between kilograms and stone instantly.
Clinically BackedWeight Loss
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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.
NHS BMI Categories and Limitations
According to NHS guidelines, BMI categories are: Healthy weight (18.5–24.9), Overweight (25.0–29.9), Obese (30.0–34.9), and higher categories above that. However, BMI has important limitations — it does not distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. BMI also does not account for where fat is stored; waist measurement matters too. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds for health risk. Your GP can provide personalised guidance on what your weight and BMI mean for your individual health.
- 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 5.8 kg to lbs?
5.8 kg multiplied by 2.20462 equals approximately 12.8 lbs. You can also use our free weight converter on this page to convert between kg, stone, and lbs instantly.
Is 5.8 kg a healthy weight?
At 5.8 kg alone, this is an extremely low weight for an adult — it would indicate severe malnutrition or be relevant only for a newborn or infant. For adult health context, your BMI depends on your height. Use our BMI calculator above to check your personal BMI if you weigh around 58 kg instead.
What does the NHS say about healthy weight?
The NHS recommends a BMI between 18.5 and 24.9 for most adults. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, 18.5 to 22.9 is recommended. A healthy weight range depends on your individual height and build. Your GP can advise what weight is healthy for you.
Why does BMI differ at different heights?
BMI is calculated as weight (kg) divided by height (metres) squared. Because height appears as a square in the formula, taller people can weigh more and still have a lower BMI than shorter people at the same weight. This is why the same weight produces very different BMI results across heights.
Can I use metric to imperial weight conversion for health decisions?
Converting units between kilograms to stone or kg to lbs is simply a mathematical conversion — it doesn't change your health status. What matters for health is your BMI (which accounts for height), waist circumference, and how you feel. Your GP can help interpret your weight in health context.
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.