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 129 Kg In Stones — And What's Your BMI?
129 kilograms converts to 20 stone and 3.2 pounds using the standard kg to stone conversion. However, your BMI — which is the key health indicator — depends entirely on your height. At 129kg, your BMI could range from around 22 (healthy weight) to 35+ (obese), depending on whether you're 1.9m or 1.6m tall. Use our free BMI calculator above to find your exact BMI instantly, or read on to see example BMI values across common 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.
129 Kg BMI Examples At Different Heights
To convert kilograms to stone and understand your health category, you need to know your height. Here are BMI examples at 129kg across typical UK adult heights:
- At 1.60m (5ft 3in): BMI = 50.2 — Severely obese (Class III)
- At 1.65m (5ft 5in): BMI = 47.4 — Severely obese (Class III)
- At 1.70m (5ft 7in): BMI = 44.6 — Severely obese (Class III)
- At 1.75m (5ft 9in): BMI = 42.1 — Severely obese (Class III)
- At 1.80m (5ft 11in): BMI = 39.8 — Obese (Class II)
- At 1.90m (6ft 3in): BMI = 35.7 — Obese (Class I)
Enter your exact height into the BMI calculator on this page to see your personal BMI category and healthy weight range according to NHS guidelines.
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.
Understanding NHS BMI Categories & Limitations
NHS BMI categories classify 129kg as follows: overweight (BMI 25–29.9), obese (30–34.9), severely obese (35–39.9), or very severely obese (40+) depending on your height. Important: BMI has limitations — it doesn't distinguish between muscle and fat, so athletes may have high BMI despite low body fat. It also doesn't account for where fat is stored; waist measurement matters too. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds apply. Your GP can provide personalised health advice based on your individual circumstances, medical history, and body composition.
- 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 many stones is 129kg?
129kg equals 20 stone and 3.2 pounds. To convert kilograms to stone, divide 129 by 6.35029. You can also use our free weight converter on this page to switch between kg, stone, and pounds instantly.
What BMI is 129kg?
At 129kg, your BMI depends on your height. At 1.70m it's 44.6 (severely obese), at 1.80m it's 39.8 (obese Class II), at 1.90m it's 35.7 (obese Class I). Use the BMI calculator above to find your exact category.
Is 129kg overweight?
Yes, for virtually all UK adults, 129kg falls into an overweight or obese category. For reference, a healthy weight range at 1.75m (5ft 9in) is approximately 56–76kg. At 129kg, you're significantly above this range regardless of height.
What's the healthy weight range at my height if I weigh 129kg?
Healthy weight depends on your height. At 1.70m, it's 53–72kg; at 1.80m, it's 60–80kg; at 1.90m, it's 67–89kg. Our BMI calculator shows your target range instantly.
Can I use a weight loss calculator to see if medication might help?
Yes. Our free GLP-1 weight loss calculator helps estimate potential weight loss at different doses if you're considering prescription weight loss treatment. However, medication eligibility requires assessment by your GP or a licensed prescriber.
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.