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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12.7 Stone to Kg — Instant Conversion
12.7 stone is equal to 80.7 kilograms. This weight conversion is straightforward using the standard kg to stone conversion formula. Whether you're checking your weight for health records, monitoring progress, or comparing UK and metric measurements, knowing how to convert between stone and kilograms is useful. Use our free weight converter above to switch between units instantly, or follow the simple conversion method below. Understanding your weight in both measurement systems helps you work effectively with NHS health tools and fitness trackers that may use different units.
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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.
How to Convert 12.7 Stone to Kilograms
To convert 12.7 stone to kilograms, multiply the stone value by 6.35029. The calculation is straightforward:
- 12.7 stone × 6.35029 = 80.67 kg (rounded to 80.7 kg)
- This conversion applies to all weights — the kilogram to stone conversion factor is always 6.35029
- Reverse conversion: divide kilograms by 6.35029 to get stone
For example, if you need to convert kilograms to stone with this formula, 80.7 kg ÷ 6.35029 = 12.7 stone. This metric to imperial weight conversion is the standard used across NHS health records, fitness apps, and UK weight management programmes. Our weight converter tool above can do this calculation instantly if you prefer not to calculate manually.
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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.
12.7 Stone in Context — Nearby Weight Values
To help you understand where 12.7 stone sits across the weight scale, here are nearby metric and imperial values:
- 12.3 stone = 78.1 kg
- 12.5 stone = 79.4 kg
- 12.7 stone = 80.7 kg
- 12.9 stone = 81.9 kg
- 13.1 stone = 83.2 kg
At an average UK height of 1.73m (5ft 8in), a weight of 80.7 kg gives a BMI of approximately 27, which falls into the overweight category according to NHS guidelines. Check your personal BMI using our free BMI calculator above — it takes your actual height into account for an accurate assessment of whether this weight falls within a healthy range for 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.
What is 12.7 stone in kilograms?
12.7 stone equals 80.7 kilograms. To calculate this yourself, multiply 12.7 by 6.35029. This conversion is the standard used across the NHS and UK health services when converting between imperial and metric weight measurements.
Is 80.7 kg a healthy weight?
Whether 80.7 kg is healthy depends on your height and individual health profile. At average UK heights, this weight typically gives a BMI in the overweight range (BMI 25–29.9). Your GP can advise you on what's appropriate for your specific height, age, and health conditions. Use our BMI calculator to check your personal BMI.
How do I convert other stone values to kilograms?
Multiply any stone value by 6.35029 to get kilograms. For example, 10 stone × 6.35029 = 63.5 kg. Our free weight converter above lets you convert any weight between stone, pounds, and kilograms instantly without doing the maths yourself.
What's the difference between stone and pounds in UK measurements?
In the UK, weight is often expressed in stone and pounds combined. One stone equals 14 pounds exactly. So 12.7 stone is approximately 12 stone 10 pounds (12st 10lbs), though stone values like 12.7 are also used in health records and digital tools for precision.
Why do UK adults use stone if the rest of the world uses kilograms?
The UK traditionally uses imperial measurements including stone for body weight, even though the NHS and clinical settings increasingly use kilograms for consistency with international standards. Many UK adults prefer stone because they've used it throughout their lives. Both units are equally valid — it's about familiarity and context.
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.