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 to Convert Kilos to Stones and Pounds
Converting kilos to stones and pounds is essential for understanding your weight in UK measurements. The NHS uses kilograms for clinical purposes, but most UK adults think in stone and pounds. This guide explains the exact conversion formula, provides a quick reference table, and shows you how to assess your weight against NHS health advice and healthy weight ranges for different heights.
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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 Conversion Formula and Quick Reference
To convert kilos to stones and pounds, use this simple formula: divide kilograms by 6.35029 to get stone. For a more practical approach, 1 kilogram equals 0.157473 stone or 2.20462 pounds. For example, 70kg converts to 11 stone 0.1 pounds (or 154.3 lbs). You can instantly convert any weight using our free weight converter above, which handles all the calculations for you.
- 70 kg: 11 stone 0.1 lbs
- 75 kg: 11 stone 11 lbs
- 80 kg: 12 stone 8 lbs
- 85 kg: 13 stone 5 lbs
- 90 kg: 14 stone 2 lbs
- 100 kg: 15 stone 10 lbs
The NHS provides guidance on healthy weight ranges, which vary by height. Use our free BMI calculator above to find your personal healthy weight range — it takes your height into account and shows you exactly where your weight sits according to NHS guidelines.
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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.
NHS Healthy Weight Ranges and BMI Categories
The NHS classifies healthy weight using BMI (Body Mass Index), which combines your weight and height. A healthy BMI for most UK adults is between 18.5 and 24.9. For example, at 1.75m (5ft 9in) tall, a healthy weight range is approximately 55–76 kg (8st 8lb to 11st 13lb). If you are of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds — your healthy BMI range starts at 18.5 but extends only to 22.9. Remember that BMI is a screening tool and doesn't account for muscle mass. Your GP can provide personalised guidance on what your weight means for your individual health.
- 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 the exact formula to convert kg to stone?
Divide kilograms by 6.35029 to get stone. For example: 70 kg ÷ 6.35029 = 11.04 stone (11 stone 0.6 lbs). Alternatively, multiply kilograms by 0.157473 to convert directly to stone. Our free weight converter above calculates this instantly for any weight.
How do I convert kilos to just pounds?
Multiply kilograms by 2.20462 to get pounds. For example, 70 kg × 2.20462 = 154.3 lbs. If you want to express the result in stone and pounds, divide the total pounds by 14 (since 1 stone = 14 pounds) to get whole stones, then the remainder is the pounds.
What does the NHS say about healthy weight ranges?
The NHS recommends a healthy BMI between 18.5 and 24.9 for most UK adults. Your healthy weight depends on your height. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS suggests a BMI range of 18.5 to 22.9, as these groups have higher health risks at higher BMI levels. Use our BMI calculator above to check your personal range.
Is BMI the only measure of healthy weight?
No. While BMI is useful, it doesn't account for muscle mass, bone density, or where fat is stored. The NHS also recommends measuring waist circumference — over 94cm (37 inches) for men or 80cm (31.5 inches) for women indicates increased health risk. Your GP can assess your overall health picture beyond just BMI.
How often should I check my weight and convert it to stone?
If you're monitoring your weight for health reasons, once per week is typical — ideally the same day and time. Weight naturally fluctuates day-to-day due to water retention and food intake. If you're tracking weight loss, our free progress tracker helps you log changes over time and identify real trends rather than day-to-day variations.
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.