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's 58.9 kg in Stone and What's Your BMI?
58.9 kg is equivalent to approximately 9 stone 4 pounds (9st 4lbs). However, your BMI—and whether this weight is healthy for you—depends entirely on your height. The same weight can be a healthy BMI for a taller person or indicate overweight for someone shorter. Use our free BMI calculator above to check your personal BMI instantly, then refer to NHS guidelines to see where you fall.
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.
58.9 Kg BMI at Different Heights
To convert 58.9 kg to stone, divide by 6.35: this gives approximately 9 stone 4 pounds. Here's what your BMI would be at common UK heights:
- 5ft 0in (152cm): BMI 25.6 — Overweight (NHS category)
- 5ft 4in (163cm): BMI 22.0 — Healthy weight
- 5ft 6in (168cm): BMI 21.0 — Healthy weight
- 5ft 8in (173cm): BMI 19.7 — Healthy weight
- 5ft 10in (178cm): BMI 18.6 — Healthy weight
- 6ft 0in (183cm): BMI 17.6 — Underweight
At 58.9 kg, your weight is healthy for most average and taller adults, but may be overweight for shorter individuals. Your GP can provide personalised guidance based on your specific height, age, and health history.
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.
Understanding BMI Categories and Limitations
The NHS defines a healthy BMI as 18.5 to 24.9 for most UK adults. If you're of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds apply (18.5–22.9 is healthy). BMI is a useful screening tool, but it has important limitations: it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. It also ignores where fat is stored—waist circumference matters for health risk. Use our weight converter above to check your measurements across different units, then discuss your results with your GP for tailored 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 58.9 kg to stone manually?
Divide 58.9 by 6.35029 to get stone. This equals approximately 9.27 stone, or 9 stone 4 pounds (since 1 stone = 14 lbs). Our free weight converter makes this instant and removes the maths.
Is 58.9 kg a healthy weight?
It depends on your height. At 58.9 kg, you'd have a healthy BMI if you're around 5ft 4in or taller. Shorter individuals may fall into the overweight range. Use the BMI calculator on this page to check your personal result.
What is the BMI formula?
BMI = weight (kg) ÷ height (m)². For 58.9 kg at 168cm (5ft 6in): 58.9 ÷ (1.68)² = 20.9, which is a healthy BMI. Our calculator computes this automatically.
How does BMI differ for different ethnic backgrounds?
The NHS recommends lower BMI thresholds for South Asian, Chinese, Black African, and Black Caribbean adults. A healthy BMI for these groups is 18.5–22.9 instead of 18.5–24.9, reflecting higher health risk at lower BMIs.
What should I do if my BMI is outside the healthy range?
Discuss your BMI with your GP, who can assess your overall health, family history, and any symptoms. Your GP may refer you to tier 1 or 2 NHS weight management support, or help you set realistic health goals based on your individual circumstances.
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.