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
57.9 Kg To Lbs — What's Your BMI?
57.9 kg is equivalent to approximately 127.6 pounds. However, whether this weight is healthy for you depends entirely on your height — the same weight gives a very different BMI at 5ft 2in compared to 6ft tall. Use our free BMI calculator above to find your personal BMI instantly, or read on to see how 57.9kg translates to BMI at common UK 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.
57.9 Kg BMI At Different Heights
At 57.9 kg, your BMI ranges from approximately 20.6 (healthy weight) at 5ft 8in tall, to 24.3 (still healthy) at 5ft 4in. Here's what BMI this weight gives at common heights:
- 5ft 0in (152cm): BMI 25.1 — overweight range
- 5ft 2in (157cm): BMI 23.5 — healthy weight
- 5ft 4in (163cm): BMI 21.8 — healthy weight
- 5ft 6in (168cm): BMI 20.5 — healthy weight
- 5ft 8in (173cm): BMI 19.3 — healthy weight
- 5ft 10in (178cm): BMI 18.4 — healthy weight
These calculations use the standard metric to imperial weight conversion (57.9 kg = 127.6 lbs) and the NHS BMI formula. Use the weight converter on this page to check other kilogram to stone conversions, and the BMI calculator above to find your exact personal BMI.
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.
NHS BMI Categories & Weight Health
According to NHS guidelines, a healthy BMI for UK adults is between 18.5 and 24.9. At 57.9 kg, you're likely in or very close to the healthy weight range depending on your height. BMI is a useful screening tool, but it has limitations — it doesn't distinguish between muscle and fat, so athletes or very muscular individuals may have a higher BMI without excess body fat. Waist circumference also matters: men should aim for under 94cm and women under 80cm. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds apply. Your GP can provide personalised guidance about 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.
What is 57.9 kg in pounds?
57.9 kg equals approximately 127.6 pounds (lbs). To convert kilograms to pounds, multiply the kg figure by 2.20462. So 57.9 × 2.20462 = 127.6 lbs. You can also use the free weight converter on this page to switch between kg, stone, and lbs instantly.
Is 57.9 kg a healthy weight?
Whether 57.9 kg is healthy depends on your height. At most average adult heights, this weight falls in the healthy BMI range (18.5–24.9). Use our free BMI calculator above to find your personal BMI, or check the height examples in the section above. Your GP can also advise based on your individual health profile.
How do I convert 57.9 kg to stone?
57.9 kg equals approximately 9 stone 1 pound. To convert kg to stone, divide by 6.35029. So 57.9 ÷ 6.35029 = 9.1 stone. Try our free weight converter on this page to convert between all units — kg, stone, and pounds — instantly.
What BMI range is healthy according to the NHS?
The NHS classifies a healthy BMI as 18.5 to 24.9 for most UK adults. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the healthy range is 18.5 to 22.9. BMI between 25.0–29.9 is overweight, and 30.0+ is obese. Use our free BMI calculator to find your exact BMI and see which category you fall into.
Does muscle weight affect BMI calculations?
Yes — BMI does not distinguish between muscle and fat. Someone who is very muscular may have a high BMI but low body fat percentage. This is why waist measurement is also important for health screening. Your GP can advise whether your weight and BMI are healthy for your individual circumstances, taking into account muscle mass and overall fitness.
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.