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
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Understanding Kilograms in UK Health Context
The kilogram (kg) is the standard metric unit for measuring body weight used by the NHS and modern UK healthcare. While many UK adults still think in stone and pounds, kilograms are essential for clinical health assessments, BMI calculations, and understanding NHS guidance on healthy weight ranges. This guide explains how kilograms work, why they matter for your health, and how to use them alongside traditional UK measurements to get a complete picture of your wellbeing.
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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.
Why Kilograms Matter for UK Health
The NHS uses kilograms as the standard for weight measurement in all clinical settings, including GP appointments, hospital assessments, and health guidelines. Understanding your weight in kg helps you engage more effectively with your healthcare provider and track health metrics accurately. One kilogram equals 2.20462 pounds or 0.157473 stone, making it straightforward to convert between systems.
For BMI calculations, kilograms are essential. Your BMI directly determines whether you fall into the NHS healthy weight range (18.5–24.9), overweight category (25–29.9), or obese category (30+). These thresholds apply universally across UK health services. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds starting at 23 kg/m², reflecting higher health risks at lower weights. Use our free BMI calculator above to check your personal BMI instantly and see where you stand relative to NHS guidance.
- Metric standard used by NHS, NICE, and all UK hospitals
- Essential for accurate BMI calculations and health monitoring
- Required for clinical assessments and prescription eligibility
- Enables comparison with NHS healthy weight ranges
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.
Converting Kilograms to UK Measurements
Converting between kg and traditional UK measurements is simple once you know the ratios. One kilogram equals 2.20462 pounds (lbs) and 0.157473 stone. For quick conversions: multiply kg by 2.2 for approximate pounds, or divide kg by 6.35 for approximate stone. Our free weight converter above lets you convert between kg, stone, and pounds instantly—useful when discussing your weight with family or comparing fitness goals with UK-based resources.
Many UK weight loss programmes, fitness trackers, and health resources now provide data in both kg and stone to accommodate user preference. Understanding both systems ensures you can interpret NHS health guidance (which uses kg), compare your weight against UK averages (which vary between systems), and track your progress using whichever measurement feels most natural to you.
- 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 many pounds is one kilogram?
One kilogram equals 2.20462 pounds (lbs). To convert any weight in kg to lbs, multiply by 2.20462. For example, 70kg equals approximately 154.3 lbs. Most UK adults also convert to stone for clarity—70kg is about 11 stone—using our weight converter.
What is the healthy weight range in kilograms for an average UK adult?
The NHS healthy BMI range is 18.5–24.9. For someone 1.73m tall (average UK male height), the healthy weight range is approximately 55–74kg. For someone 1.62m tall (average UK female height), it's approximately 49–65kg. Use our free BMI calculator to find your personal healthy range.
Why does the NHS use kilograms instead of stone?
Kilograms are the international metric standard used across all modern healthcare systems, enabling consistent global medical research and practice. BMI calculations, prescription dosing, and clinical guidelines all rely on kg measurements, making it the standard for NHS clinical assessments.
How do I use kilograms to track weight loss?
Record your weight in kg weekly or monthly using the same scales for consistency. Our free progress tracker lets you log weight in kg and see your trend over time. A safe, sustainable weight loss rate is approximately 0.5–1kg per week through calorie deficit and increased activity.
Does my weight in kilograms change my BMI eligibility for weight loss treatment?
No—BMI category is the same regardless of whether you measure in kg, stone, or pounds. However, BMI thresholds for prescription weight loss treatment differ by ethnicity. Adults with BMI 30+ (or 27.5+ for South Asian/Black African/Caribbean/Chinese heritage) may be eligible. Your GP can assess your personal situation.
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.