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
Conversion Weight — Understand Your UK Weight Measurements
Converting weight between different units is essential for understanding your health in the UK, where we use stone and pounds alongside kilograms. Whether you're tracking your weight management journey, checking your BMI, or simply need to switch between metric and imperial measurements, understanding how to convert your weight accurately helps you make informed health decisions. This guide explains weight conversions and how they relate to NHS health guidance and healthy weight ranges for UK adults.
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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.
How to Convert Weight Between Units
The most common weight conversions in the UK are between kilograms (kg), stone, and pounds (lbs). Here are the standard conversion formulas:
- 1 kg = 0.157473 stone (or divide kg by 6.35029)
- 1 stone = 6.35029 kg
- 1 stone = 14 pounds exactly
- 1 kg = 2.20462 lbs
For example, 70kg converts to 11 stone 0.1lbs. Rather than calculating manually, use our free weight converter above to instantly switch between all three units. This is especially helpful when you're monitoring your weight management progress or discussing your weight with your GP, as UK healthcare often uses both metric and imperial measurements.
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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.
Why Weight Conversion Matters for UK Health
Understanding your weight in familiar UK measurements helps you engage more effectively with weight management and health tracking. The NHS uses kilogrammes clinically but recognises that most UK adults prefer to think about their weight in stone and pounds. Converting your weight accurately is also the first step towards calculating your BMI and understanding your healthy weight UK range.
Use our free BMI calculator above to check where your converted weight falls on the NHS healthy weight scale (BMI 18.5–24.9). This helps you understand whether your current weight is within the recommended range for your height, based on NHS guidance. Individual health factors vary, so if you have concerns about your weight or health, always speak to your GP for personalised nhs 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.
What is the exact conversion from kg to stone?
To convert kilograms to stone, divide by 6.35029. For example, 70kg ÷ 6.35029 = 11.03 stone (or 11 stone 0.1lbs). For quick conversions, use our free weight converter tool above, which handles all calculations instantly in UK measurements.
How do I convert stone and pounds to kilograms?
Multiply stone by 6.35029 and pounds by 0.453592, then add the results together. For example: (11 × 6.35029) + (0.1 × 0.453592) = 69.96kg. Our weight converter above does this automatically for you.
Why does the UK use both stone and kilograms for weight?
Historically, the UK adopted stone and pounds for everyday use, while healthcare systems use metric (kg) for clinical measurements. Today, UK adults often prefer stone for personal weight tracking, but GPs and NHS services use kilograms. This is why understanding both conversions is useful.
Does my converted weight affect my BMI calculation?
No — BMI is the same regardless of which units you use. Whether you calculate using kg and metres or lbs and inches, your BMI result is identical. Use our free BMI calculator above to check your personal BMI using your converted weight and height.
What is the healthy weight range in stone for a UK adult?
The NHS healthy weight range (BMI 18.5–24.9) varies by height. For example, at 5ft 8in (173cm), a healthy weight is roughly 8st 10lbs to 11st 10lbs. Use our BMI calculator above to find your personal healthy weight range based on your height and current weight.
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.