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
58.9kg in Stone — Is This a Healthy Weight?
58.9kg converts to approximately 9 stone 4 pounds in UK measurements. Whether this weight is healthy depends entirely on your height, age, and individual health profile. The NHS uses BMI (Body Mass Index) as a screening tool to determine if a weight falls within a healthy range. Use our free BMI calculator above to check your personal BMI instantly by entering your weight and height. This guide shows you healthy weight ranges for different heights and explains what the NHS considers a healthy weight.
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.
Healthy Weight Ranges by Height
At 58.9kg, whether you're at a healthy weight depends on your height. The NHS defines a healthy BMI as between 18.5 and 24.9. Here are three examples showing how 58.9kg translates across different heights:
- At 1.60m (5ft 3in): 58.9kg gives a BMI of 22.9 — within the healthy range
- At 1.70m (5ft 7in): 58.9kg gives a BMI of 20.4 — healthy weight
- At 1.80m (5ft 11in): 58.9kg gives a BMI of 18.2 — healthy but towards the lower end
The weight converter on this page allows you to easily check your weight in stone and pounds. Remember that BMI is a screening tool only — it does not account for muscle mass or where fat is stored, so it's not the complete picture of health.
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 Guidance and Health Context
The NHS recommends that healthy weight is a BMI between 18.5 and 24.9. At 58.9kg, you may be within this range depending on your height. Beyond BMI, the NHS also considers waist circumference important for health. A waist measurement of over 80cm (31.5 inches) for women or over 94cm (37 inches) for men suggests increased health risk. If 58.9kg puts you outside the healthy BMI range for your height, or if you have concerns about your weight and health, speak with your GP. They can assess your individual circumstances, including family history, fitness level, and any health conditions.
- 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 58.9kg in stone exactly?
58.9kg converts to 9 stone 4.2 pounds (9st 4lbs). Use the formula: divide kilograms by 6.35 to get stone. Our free weight converter on this page converts between kg, stone, and pounds instantly.
Is 58.9kg healthy for all heights?
No. Healthy weight depends on height. At 1.60m, 58.9kg is healthy (BMI 22.9). At 1.80m, it's still healthy but lower (BMI 18.2). Use our BMI calculator above to check your personal healthy range.
What if my BMI is outside the healthy range?
If your BMI is below 18.5 (underweight) or above 25 (overweight), speak with your GP. They can assess whether your weight poses any health risks and discuss any dietary or lifestyle changes that might help.
Does 58.9kg mean I need to lose weight?
Not necessarily. It depends on your height and individual health. At 58.9kg, many adults fall within the healthy BMI range. Your GP can advise whether your weight is healthy for you specifically.
What is waist circumference and why does it matter?
Waist circumference measures fat around your abdomen, which is linked to health risks. The NHS considers over 80cm (women) or 94cm (men) as increased risk. Measuring your waist alongside BMI gives a more complete health picture.
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.