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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Convert Kg to Stone — NHS Healthy Weight Ranges
Converting kilograms to stone is essential for understanding your weight in UK measurements. Our free kg to stone calculator helps you instantly convert metric weight to imperial units, and shows you where your weight sits within NHS healthy weight ranges. Whether you're tracking your health, preparing for a GP appointment, or simply curious about your weight in stone and pounds, this guide explains the conversion process and helps you interpret your result using official NHS BMI categories for adults across the UK.
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.
NHS Healthy Weight Ranges by Height in Stone and Kg
The NHS defines healthy weight using BMI (body mass index). A healthy BMI is between 18.5 and 24.9, which translates to different weights depending on your height. Here are NHS healthy weight ranges for common UK adult heights, expressed in both kilograms and stone:
- 5ft 4in (163cm): Healthy weight 50–65kg (7st 11lbs to 10st 3lbs)
- 5ft 6in (168cm): Healthy weight 55–73kg (8st 8lbs to 11st 6lbs)
- 5ft 8in (173cm): Healthy weight 55–79kg (8st 8lbs to 12st 6lbs)
- 5ft 10in (178cm): Healthy weight 60–85kg (9st 6lbs to 13st 5lbs)
- 6ft (183cm): Healthy weight 65–92kg (10st 3lbs to 14st 6lbs)
If your current weight falls outside these ranges, our free BMI calculator above can show you exactly where you sit within the NHS categories (underweight, healthy, overweight, or obese) and what your healthy weight range is for your specific height.
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 Categories and Ethnicity-Adjusted Thresholds
The NHS recognises that weight thresholds differ for people of South Asian, Chinese, Black African, and Black Caribbean heritage. These groups face higher health risks at lower BMI levels, so the NHS recommends lower thresholds: a healthy BMI starts at 18.5 but overweight begins at 23.0 (not 25.0). Additionally, waist measurement matters: men should aim for under 94cm (37 inches) and women under 80cm (31.5 inches) for low health risk. Use our weight converter tool above to switch between kg, stone, and pounds, then cross-reference your measurements with NHS guidance or speak to your GP about your personal healthy weight target.
- 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 kg to stone using the kg to stone calculator?
Simply enter your weight in kilograms into the calculator above — it instantly converts to stone and pounds. The formula is: kg ÷ 6.35029 = stone. For example, 70kg equals 11 stone 0.1lbs. Our calculator does this automatically, saving you the maths.
What is considered a healthy weight according to NHS guidelines?
A healthy BMI is between 18.5 and 24.9, which varies by height. Use the BMI calculator on this page to find your healthy weight range. For most adults, this means maintaining a weight where your BMI falls within that band. Your GP can advise on your personal target.
Are there different healthy weight ranges for different ethnic backgrounds?
Yes. The NHS recommends lower thresholds for people of South Asian, Chinese, Black African, and Black Caribbean heritage — with overweight starting at BMI 23.0 rather than 25.0. If you belong to these groups, ask your GP about thresholds specific to your background.
How do I know if my weight in stone is healthy for my height?
Use the weight converter to change your kg to stone, then check the NHS healthy weight ranges in Section 2 above for your height. You can also calculate your BMI using our free calculator to see exactly which NHS category (underweight, healthy, overweight, or obese) your weight falls into.
Why do I need to convert kg to stone if the NHS uses kg?
Most UK adults think in stone and pounds for personal weight, even though NHS clinical records use kilograms. Converting helps you understand your weight in the units you're familiar with and compare yourself to UK health guidance more easily.
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.