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
What is 21 stone in pounds?
21 stone is equal to 294 pounds (lbs). This conversion uses the standard UK imperial measurement where 1 stone equals exactly 14 pounds. If you need to convert your weight between metric and imperial units, or understand your weight in different measurement systems, our free weight converter above makes this simple. At this weight level, understanding your BMI and health context is important, so we've included guidance on what this weight means for UK adults at different heights.
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.
21 Stone to Pounds Conversion Table
21 stone = 294 lbs exactly.
To convert stone to pounds using the standard metric to imperial weight conversion, multiply the stone value by 14. The formula is: stone × 14 = pounds. So 21 × 14 = 294 lbs.
Here's a handy reference table showing 21 stone alongside nearby values in both stone and pounds:
- 20 stone = 280 lbs
- 20.5 stone = 287 lbs
- 21 stone = 294 lbs
- 21.5 stone = 301 lbs
- 22 stone = 308 lbs
If you need to convert kilograms to stone or work with kg to stone conversions, use our free weight converter tool to switch between all major weight units instantly.
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.
Health Context at 21 Stone
At 21 stone (294 lbs), your health context depends on your height. For an adult of average UK height (around 1.70m or 5ft 7in), 21 stone typically gives a BMI in the obese range according to NHS guidelines. Use our free BMI calculator above to check your personal BMI and see where you fall on the NHS weight categories. Even modest weight loss of 5–10% can bring meaningful health benefits. If you're considering weight management options, your GP can discuss approaches suited to your individual circumstances, which may include lifestyle changes or, for eligible individuals, prescription weight loss support.
- 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 do I convert stone to kilograms?
To convert stone to kilograms, multiply the stone value by 6.35029. For example, 21 stone × 6.35029 = approximately 133.4 kg. Alternatively, use our free weight converter above to switch between stone, kilograms, and pounds instantly.
What is 21 stone in kg?
21 stone is approximately 133.4 kg. You can use the kilogram to stone conversion by dividing kg by 6.35029. Our weight converter tool handles all metric to imperial weight conversions automatically.
Is 21 stone a healthy weight?
Whether 21 stone is healthy depends on your height. Use our BMI calculator to check your personal BMI. At most UK adult heights, this weight would typically fall in the obese range. Your GP can provide personalised health advice based on your individual circumstances and any existing health conditions.
How much should I weigh for my height?
The NHS healthy weight range varies by height. For example, an adult 5ft 8in tall should ideally weigh between 55–75 kg (8st 10lbs–11st 10lbs). Use our free BMI calculator to find your healthy weight range instantly, or consult your GP for personalised guidance.
Can I lose weight safely from 21 stone?
Yes. The NHS recommends losing weight at a rate of 0.5–1 kg per week for sustainable results. This typically requires a calorie deficit of around 500 kcal daily. Even a clinically studied weight loss can improve health. If you'd like support, your GP can discuss options including behaviour change programmes, and for eligible individuals, prescription weight management medication. Our progress tracker can help you log your journey.
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.