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
How Many Stones In — Quick UK Weight Conversion
Understanding how many stones in a given weight is essential for UK health management. In the UK, we primarily measure body weight in stones and pounds, unlike most of Europe which uses kilograms. This guide explains stone conversions, how to use them for your health context, and why the NHS includes weight measurements in different units. Whether you're checking your BMI, discussing weight with your GP, or tracking progress, knowing how to convert between stones, pounds, and kilograms is straightforward and practical.
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.
Stone to Kilogram Conversion — The Complete Formula
1 stone equals exactly 6.35029 kilograms. To convert any weight from stones to kg, multiply the number of stones by 6.35029. For example, 10 stones × 6.35029 = 63.5 kg. To reverse the calculation and convert kg to stone, divide the kilogram weight by 6.35029. So 70 kg ÷ 6.35029 = approximately 11 stone.
- Stone to pounds: 1 stone = 14 pounds exactly
- Pounds to kg: 1 pound = 0.453592 kg
- Stone and pounds combined: (stone × 6.35029) + (pounds × 0.453592) = total kg
Use our free weight converter above to instantly calculate conversions between stone, pounds, and kilograms — no mental maths required. This aligns with NHS guidance, which uses both metric (kg) and imperial (stone) measurements depending on context.
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 Stones Matter for Your UK Health Guide
Stone measurements are deeply embedded in UK health culture. Your GP will discuss your weight in both stone and kilograms. NHS healthy weight ranges are published in stone for easy reference. When you calculate your BMI or check whether you're in a healthy weight range, understanding stones helps you contextualise the result. The NHS recommends a healthy weight range of 18.5–24.9 BMI, which translates to specific stone ranges depending on your height. For example, at 5ft 8in (173cm), a healthy weight is roughly 8st 10lbs to 11st 10lbs.
- Most UK weight loss programmes use stones as the primary measurement
- Your bathroom scales likely display both stone and kg
- Medical records in the UK often record both units
Calculate your personal BMI and healthy weight range using our free BMI calculator on this page — it works with stone, pounds, or kilograms.
- 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.
What's the easiest way to convert stones to kilograms quickly?
Divide the stone weight by 6.35029 (or multiply by 0.157473). For quick mental maths, approximate: 1 stone ≈ 6.4 kg. So 10 stones ≈ 64 kg. Our free weight converter on this page gives exact results instantly, which is easier than a UK pharmacy calculation.
How many stones are in 70kg?
70 kg ÷ 6.35029 = approximately 11 stone and 0.1 pounds (or 11 stone exactly, for practical purposes). In decimal: 70 kg = 11.03 stone. The NHS uses both kg and stone interchangeably, so knowing both units helps you understand your weight in UK health context.
Is stone measurement used anywhere outside the UK?
Stones are primarily used in the UK, Ireland, and some Commonwealth nations. Most of the world uses kilograms exclusively. The US uses pounds only (not stones). In UK healthcare, both stone and kg are standard, so it's helpful to be familiar with both measurements.
Why does the NHS use both stones and kilograms?
The NHS serves a population familiar with stones — many UK adults grew up with this measurement. To avoid confusion, NHS materials present healthy weight ranges in both units. This makes health guidance accessible and relatable, whether you think in stones or kilograms.
How does my weight in stones affect my BMI calculation?
BMI is calculated from weight in kilograms and height in metres. If you know your weight in stones, convert it to kg first (divide by 6.35029), then use the BMI formula. Alternatively, our free BMI calculator handles conversions automatically — just enter your stone weight and height, and it gives your BMI instantly.
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.