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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How to Convert Kg to Stone — UK Health Guide
Converting kilograms to stone is straightforward using the standard conversion formula: divide the kilogram amount by 6.35. This guide explains how to convert kg to stone accurately, why UK adults use both measurements, and how weight conversions relate to your health. Whether you're tracking progress, comparing health information, or simply need to switch between metric and imperial units, understanding kg to stone conversions is essential for navigating UK health guidance and NHS recommendations.
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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.
The Kg to Stone Conversion Formula
The standard conversion is simple: 1 kg = 0.157473 stone, or working the other way, 1 stone = 6.35029 kg. To convert any weight from kilograms to stone, divide the kilogram figure by 6.35.
Example conversions:
- 70 kg ÷ 6.35 = 11 stone 0.1 lbs
- 80 kg ÷ 6.35 = 12 stone 8 lbs
- 90 kg ÷ 6.35 = 14 stone 2 lbs
- 100 kg ÷ 6.35 = 15 stone 10 lbs
For faster conversions, use our free weight converter above, which handles kg to stone conversions instantly and also shows you the equivalent in pounds. This is especially useful if you're comparing your weight across different health resources—NHS guidance uses kg, but many UK adults prefer stone for personal tracking.
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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 Both Units Matter for UK Health
The UK uniquely uses both metric (kg) and imperial (stone and pounds) for adult weight measurement. The NHS uses kilograms in clinical settings and for BMI calculations, but most UK adults still think and talk about weight in stone. This dual system means understanding both conversions is important when reading health information, using health calculators, or discussing weight with your GP.
Once you've converted your weight to stone, you can assess it against UK healthy weight ranges. Calculate your BMI using our free BMI calculator to see where your weight falls according to NHS guidelines—whether healthy, overweight, or obese—regardless of which unit you use.
Weight context matters as much as the number itself. A weight of 70 kg (11 stone) means something different depending on your height. Someone who is 160 cm tall at 70 kg has a very different health profile to someone 190 cm tall at the same weight. This is why BMI—which accounts for both weight and height—is the NHS standard for assessing whether a weight is healthy. Our weight converter works alongside your height to give you full health context, not just a raw unit conversion.
- 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.
Is there a quick way to convert kg to stone without a calculator?
Yes. Divide the kg amount by 6.35 mentally or on paper. For example, 80 kg ÷ 6.35 ≈ 12.6 stone (12 stone 8 lbs). For most daily purposes, this rough calculation is sufficient, but our free weight converter above gives exact conversions in seconds.
Why do UK health services use kg instead of stone?
Kilogrammes are the international standard for clinical measurement. The NHS uses kg for consistency, precision, and alignment with global health data. However, UK adults' personal preference for stone remains, so both units are widely used in UK health communication.
How does my weight in stone relate to healthy weight?
Your weight in stone only tells part of the story. A healthy weight depends on your height, age, and body composition. Use our free BMI calculator to assess your weight against NHS healthy ranges (18.5 to 24.9 BMI for most adults). Your GP can also advise on what weight range is healthy for you personally.
Can I use kg to stone conversion for children's weight?
Yes, the conversion formula works the same way. However, children's weight assessment is not based on adult BMI categories. If you're concerned about a child's weight, speak to your health visitor or GP, who can use UK90 growth charts to assess whether the child's weight is appropriate for their age and height.
Is there a difference between stone and pounds in the UK system?
Yes. One stone equals exactly 14 pounds. When stating weight in UK measurements, it's often written as "stone and pounds"—for example, "11 stone 3 pounds" (11st 3lbs). Our weight converter shows both units automatically, so you can see the full picture in both metric and imperial formats.
Ready to take control of your weight loss journey?
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