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 Loss Converter — Understanding Your Progress in UK Measurements
A weight loss converter helps you track your weight management journey using UK measurements that make sense to you. Whether you're monitoring progress in kilograms, stone, or pounds, converting between units helps you understand exactly how much weight you've lost and where you stand on NHS weight loss guidelines. Understanding your weight in familiar measurements is the first step towards sustainable weight management in 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.
How to Use a Weight Loss Converter for Your Progress
A weight loss converter works by translating your weight between different measurement systems — kilograms (kg), stone, and pounds (lbs) — so you can track your progress in whichever unit feels most natural to you. UK adults typically use stone and pounds, but many health services, including the NHS, record weight in kilograms for clinical accuracy.
- From kg to stone: Divide your weight in kilograms by 6.35 to get stone, or multiply by 2.20 to get pounds
- From stone to kg: Multiply stone by 6.35, or multiply pounds by 0.454
- Track your starting point: Record your initial weight in all three units so you can see progress however you prefer
- Calculate weight lost: Subtract your current weight from your starting weight in any unit to see your total loss
Our free weight converter tool above lets you instantly switch between measurements — simply enter your weight and watch it convert across all units in real time. This is especially useful if you're following NHS weight loss guidance, using prescription weight loss medication like Mounjaro or Wegovy, or working with a healthcare provider who records weight in different formats.
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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.
Weight Loss Progress and UK Health Thresholds
Converting your weight is also valuable for understanding where you sit on NHS weight management thresholds. A healthy BMI in the UK ranges from 18.5 to 24.9 — and our free BMI calculator helps you see exactly where your current weight places you. Even modest weight loss — around 5% of your body weight — can have meaningful health benefits including lower blood pressure, improved blood sugar control, and reduced strain on your joints.
If you're using prescription weight loss medication as part of your weight management plan, tracking progress in your preferred unit keeps you motivated. Use our GLP-1 weight loss calculator to project potential results at different doses, and use our progress tracker to log your weight regularly. The NHS recommends losing weight at a sustainable rate of 0.5 to 1 kg (1–2 lbs) per week — converting between units helps you see if you're on track with this guidance.
- 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 80kg to stone and pounds?
To convert 80kg to stone, divide by 6.35: 80 ÷ 6.35 = 12.6 stone (approximately 12 stone 8 pounds). To convert directly to pounds, multiply by 2.20: 80 × 2.20 = 176 lbs. Our weight converter tool above does this instantly.
What's the NHS recommended rate of weight loss?
The NHS recommends losing 0.5 to 1 kg (1–2 lbs) per week for sustainable, healthy weight loss. Faster loss is possible with medical support, but slower, steady progress is more likely to last long term and preserve muscle mass.
How does weight loss converter help with medication like Wegovy or Mounjaro?
If you're using prescription weight loss medication, your GP or prescriber may record weight in kilograms, but you might prefer tracking in stone. A converter lets you see your progress in whichever unit feels most natural, helping you stay motivated throughout your weight management journey.
What's the difference between BMI and weight loss progress?
BMI measures the relationship between your weight and height to indicate health risk categories. Weight loss progress tracks how much weight you've lost from your starting point. Both matter — your BMI tells you if you're in a healthy range, while progress tracking shows your improvement over time.
Can I use a weight loss converter to calculate my healthy weight range?
Yes. First, calculate your healthy BMI range (18.5–24.9 for most UK adults, lower thresholds for some ethnic groups) using our BMI calculator. Then use the weight converter to see what that range looks like in stone, pounds, or kilograms — whatever helps you visualise your goal most clearly.
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.