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
Weight Conversion Using NHS Guidelines
Converting your weight between kilograms, stone, and pounds is straightforward, but understanding what your weight means for your health is what matters most. The NHS uses kilogrammes for clinical measurements, yet most UK adults think in stone and pounds. This guide explains how to convert your weight accurately and places it in context with NHS health guidance and BMI thresholds. Whether you're tracking your progress or understanding your health status, knowing your weight in both metric and imperial units helps you stay informed.
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.
How to Convert Weight — Quick Reference
Converting kilograms to stone: Divide your weight in kg by 6.35029. For example, 70kg ÷ 6.35 = 11 stone (approximately). To convert kg to pounds, multiply by 2.20462.
Converting stone to kilograms: Multiply your stone weight by 6.35029. One stone equals exactly 14 pounds, so if you weigh 11 stone 4 pounds, that's (11 × 6.35) + (4 × 0.454) = approximately 72kg.
Our free weight converter above does these calculations instantly — just enter your weight in any unit and switch between kg, stone, and pounds. This is especially useful when comparing your weight against NHS guidance, which typically uses kilogrammes for clinical thresholds.
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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.
NHS Healthy Weight Context
According to NHS health advice, a healthy weight depends on your height and is expressed as a BMI (body mass index) between 18.5 and 24.9. Use our free BMI calculator above to check where your converted weight sits on the NHS scale. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds starting at BMI 23, as these groups face higher health risks at lower weights.
Once you've converted your weight, understanding the context matters more than the number itself. A weight of 70kg might be healthy for a tall person but overweight for someone shorter. NHS guidance emphasises that even a 5–10% reduction in body weight can improve your health outcomes significantly.
- 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 70kg to stone and pounds?
Divide 70 by 6.35029, which equals 11 stone (11st 0.1lbs). Use our free weight converter on this page for instant conversions. You can also convert 70kg to 154.3 pounds if you prefer imperial only.
Why does the NHS use kilograms when the UK uses stone?
NHS clinical guidance uses kilogrammes because it's the international standard for healthcare and research. However, UK adults typically measure themselves in stone and pounds, so you'll often see both units in NHS patient information.
Is my weight healthy according to NHS guidance?
That depends on your height. Calculate your BMI using our free BMI calculator above — the NHS considers a BMI of 18.5–24.9 healthy for most adults. For South Asian or Black African heritage adults, the healthy range starts lower at BMI 18.5–22.9.
How does weight conversion help with weight management?
Converting your weight between units helps you track progress consistently. If you're using a weight management approach, recording your weight in the same unit every time (whether kg or stone) makes it easier to spot trends and stay motivated.
Where can I find my healthy weight range in stone?
Use our BMI calculator to find your healthy weight range for your height — it displays results in both kg and stone. Typically, a healthy weight range for someone 5ft 8in is roughly 8st 10lbs to 11st 10lbs, depending on your exact height and build.
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.