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
Calculate Kilograms for Your Health
Calculating kilograms is essential for understanding your weight in metric terms and assessing your health using NHS guidance. Whether you're converting from stone and pounds or tracking weight loss progress, knowing your weight in kilograms helps you work with your GP, use health calculators, and follow evidence-based weight management advice. This UK health guide explains what you need to know about calculating and using kilograms in your health journey.
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 Calculate Your Weight in Kilograms
If you know your weight in stone and pounds, converting to kilograms is straightforward using a simple formula. Multiply your weight in pounds by 0.453592 to get kilograms, or divide your weight in kilograms by 2.20462 to convert back to pounds. For stone, remember that 1 stone equals 6.35029 kg. For example, if you weigh 11 stone (154 lbs), this equals approximately 70 kg. Use our free weight converter above to instantly switch between kg, stone, and pounds — no a UK pharmacy calculation needed. Knowing your exact weight in kilograms is important because NHS health calculators, BMI assessments, and medication dosing all use metric measurements. This makes it easier to track progress consistently and discuss your weight with your GP using the same units they use in their records.
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.
Why Kilograms Matter for Your Health
Kilograms are the standard unit used by the NHS, clinical guidelines, and health professionals across the UK. When you calculate your weight in kilograms, you can accurately determine your BMI (body mass index) and see where you fall on NHS healthy weight charts. Calculate your BMI using our free BMI calculator above — simply enter your height and weight in kg, and you'll instantly see your category (underweight, healthy weight, overweight, or obese) according to NHS standards. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds apply, so knowing your exact kg weight is crucial for accurate assessment. If you're considering weight management options, including prescription treatments, your weight in kilograms determines eligibility and medication doses.
- 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 my weight from stone and pounds to kilograms?
Multiply your total weight in pounds by 0.453592 to get kg. For example, 11 stone (154 lbs) equals 70 kg. Alternatively, use our free weight converter above to do this instantly without a UK pharmacy calculation.
Why do I need to know my weight in kilograms?
The NHS, GPs, and health calculators all use kilograms. Knowing your weight in kg lets you calculate your BMI accurately, track progress consistently, and discuss your health with healthcare professionals using standard measurements.
What is my healthy weight range in kilograms?
For adults, a healthy BMI is 18.5–24.9. Your healthy weight range depends on your height. Use our BMI calculator above to find your personal healthy weight range in kg based on your exact measurements.
Does calculating kilograms help with weight loss tracking?
Yes. Tracking weight in kilograms provides consistent, standard measurements that work with NHS guidelines and weight loss calculators. Our free progress tracker lets you log your weight in kg and track changes over time.
Are kilograms the same across all health services in the UK?
Yes. All NHS services, GPs, and UK health organisations use kilograms as the standard unit for weight measurement, making it the universal standard for UK health records and assessments.
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.