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 and Height Converter for UK Adults
Converting between kilograms, stone, pounds, and height measurements is essential for understanding your health in the UK context. Whether you're checking your BMI, comparing health statistics, or simply need to switch between metric and imperial units, our free weight and height converter makes it quick and easy. MyWeightCheck provides instant conversions aligned with NHS guidance and UK health standards.
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 UK Weight and Height Conversions
The UK uses a unique mix of metric and imperial measurements for health. Weight is commonly expressed in stone and pounds, whilst healthcare systems use kilograms. Height may be given in feet and inches or centimetres depending on context. Use our free weight converter above to instantly switch between kg, stone, and lbs. For height, the conversion is straightforward: multiply centimetres by 0.3937 to get inches, or divide by 2.54. Once you have both measurements in consistent units, you can calculate your BMI using our BMI calculator on this page—essential for understanding your weight category according to NHS guidance. A healthy BMI range is 18.5–24.9 for most adults, though lower thresholds apply for adults of South Asian, Chinese, Black African, or Black Caribbean heritage.
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.
NHS Health Guidance and Weight Management Tools
The NHS recommends using both BMI and waist circumference to assess weight-related health risk. Knowing your exact weight and height in both metric and imperial units helps you communicate with your GP and understand health information from different sources. Our weight and height converter is designed specifically for UK adults and integrates seamlessly with NHS health standards. Beyond simple conversion, understanding your measurements in context—your BMI, healthy weight range, and waist measurement—gives you actionable insight into your health. If you're considering weight management, our free GLP-1 weight loss calculator can help estimate potential outcomes with evidence-based treatment, always alongside lifestyle changes and professional 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 my weight from kg to stone and pounds?
Divide kilograms by 6.35029 to get stone. Alternatively, use our free weight converter above for gradual improvement. For example, 70kg equals 11 stone and 0.1 pounds. Our converter handles the calculation automatically.
What's the difference between height in feet/inches and centimetres?
Centimetres are metric (used in clinical settings), whilst feet and inches are imperial (common in the UK). Multiply cm by 0.3937 to convert to inches, or divide by 2.54. For example, 173cm is approximately 5ft 8in.
Why is knowing both my weight and height important?
Weight and height together determine your BMI, which is used by the NHS to assess health risk. Your BMI category influences health recommendations and eligibility for weight management support. Use our BMI calculator to see your personal BMI and healthy weight range.
What should my healthy weight be based on my height?
Healthy weight depends on your height and BMI range. The NHS recommends a BMI of 18.5–24.9 (lower for some ethnic groups). Enter your height and weight into our free BMI calculator on this page to find your personal healthy weight range.
Can I use weight and height conversions for children?
Adult conversion formulas work for children's measurements, but BMI categories are different for children—they use age and sex-specific centiles. Always consult the NHS Healthy Weight Calculator for children or speak to your GP for personalised guidance.
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.