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
Converting Kilograms to Stone — NHS UK Context
The NHS uses kilograms for clinical measurements, but most UK adults think about their weight in stone and pounds. Converting kg to stone is straightforward: divide kilograms by 6.35 to get stone. Understanding this conversion helps you engage with NHS health advice, track your weight management goals, and interpret your BMI using UK measurements that feel familiar. Our free weight converter makes this instant, but knowing the maths behind it helps you understand your weight in the context of NHS guidance and your personal health.
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 Health Guidance and UK Weight Standards
The NHS recommends a healthy weight range based on BMI of 18.5 to 24.9 for most UK adults. To know whether your weight in kg falls into this healthy range, you need to calculate your BMI or convert to stone and compare against NHS guidelines. For example, at 1.73m (5ft 8in), a healthy weight range is approximately 55 to 75 kg — or 8st 8lbs to 11st 10lbs in stone.
Adults of South Asian, Chinese, Black African, or Black Caribbean heritage have different risk profiles; the NHS recommends lower BMI thresholds (18.5 to 22.9 healthy range). Weight management through NHS services typically uses kg for clinical tracking, but your GP and weight management programmes often discuss weight in stone because that's what UK patients understand.
- Use our free BMI calculator to check your personal BMI instantly in your preferred units
- NHS guidance emphasizes sustainable weight loss of 0.5–1 kg (approximately 1–2 lbs) per week
- Your GP can provide personalised advice based on your individual health profile and weight 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.
Converting Your Weight and Taking Action
To convert your weight from kg to stone, divide by 6.35029. For example: 70 kg ÷ 6.35 = 11 stone and 0.1 lbs. Use our free weight converter above for instant conversion between kg, stone, and pounds — it's quicker and removes the mental maths.
Once you know your weight in stone, compare it against NHS healthy weight ranges for your height. If you're interested in weight loss or want to understand your health risk, calculate your BMI using the tool on this page — BMI is the NHS standard for assessing whether your weight is healthy for your height. If you have concerns about your weight or want personalised guidance, your GP can assess your individual circumstances and discuss whether weight management support might help.
- 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 70 kg to stone?
Divide 70 by 6.35: 70 ÷ 6.35 = 11 stone and 0.1 lbs. Use our free weight converter above for instant conversions. Most UK adults find it easier to think in stone, so this simple conversion helps you understand your weight in familiar units.
What's the NHS healthy weight range in stone for a 1.75m tall adult?
At 1.75m, the healthy BMI range (18.5–24.9) equals approximately 56.5 to 76 kg, or roughly 8st 13lbs to 12st in stone. Your exact healthy range depends on your individual health factors. Use our BMI calculator to check your personal healthy weight range.
Does the NHS use kg or stone for weight measurements?
The NHS uses kilograms for clinical measurements and health records. However, most UK patients prefer stone and pounds in everyday conversation. Your GP's records will show kg, but they'll often discuss your weight in stone because that's what feels natural to British adults.
How does my weight in kg relate to healthy weight according to NHS guidelines?
The NHS defines healthy weight using BMI (weight in kg divided by height in metres squared). A BMI of 18.5–24.9 is healthy for most adults. Use our free BMI calculator to see where your kg weight falls and what your healthy range is for your height.
Can I lose weight safely with NHS support if I'm above the healthy kg range?
Yes. The NHS recommends sustainable weight loss of 0.5–1 kg per week through lifestyle changes. If you need support, speak to your GP about tier 1 or tier 2 weight management programmes in your area. For more complex cases, your GP can refer you to specialist services.
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.