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 66 Kilos in Stone?
66 kilograms converts to 10 stone 6 pounds (10st 6lbs) or 145.5 lbs in imperial measurements. However, your BMI—and whether this weight is healthy for you—depends entirely on your height. Use our free BMI calculator above to find your personal BMI instantly, or read on to see what 66kg means across different heights and NHS weight categories.
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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.
66kg BMI at Different Heights
66kg is a different weight category depending on how tall you are. Here's what your BMI would be at common UK heights:
- 5ft 0in (152cm): BMI 28.7 — overweight (NHS category)
- 5ft 3in (160cm): BMI 26.2 — overweight
- 5ft 6in (168cm): BMI 23.9 — healthy weight
- 5ft 9in (175cm): BMI 21.9 — healthy weight
- 5ft 11in (180cm): BMI 20.4 — healthy weight
- 6ft 0in (183cm): BMI 19.8 — healthy weight
To convert 66kg to stone more precisely: divide by 6.35 to get 10.4 stone (10st 6lbs). Try our weight converter above to check your exact measurements in kg to stone and see your corresponding BMI category 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.
NHS BMI Categories & Healthy Weight Context
According to NHS guidelines, a healthy BMI sits between 18.5 and 24.9 for most adults. At 66kg, whether you're in a healthy range depends on your height. The BMI limitations are important to remember: BMI doesn't account for muscle mass, bone density, or where fat is stored on your body. A fit athlete might have a high BMI but low body fat. If your 66kg weight puts you into the overweight category, even losing 5–10% of your body weight can improve blood pressure, blood sugar control, and overall health. Your GP can give you personalised guidance on what's healthy for your individual circumstances.
- 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 66 kilos into stones accurately?
Divide 66kg by 6.35 to get 10.4 stone. To convert to stone and pounds: 10 stone equals 140 lbs, so 66kg is approximately 10 stone and 5.5 pounds (10st 5.5lbs). Use the weight converter tool on this page for instant conversions between kilos, stones, and pounds.
Is 66kg a healthy weight?
It depends on your height. At 5ft 6in, 66kg gives a BMI of 23.9 (healthy). At 5ft 0in, it gives 28.7 (overweight). Use our free BMI calculator above with your actual height to find your personal BMI and NHS category.
What's the healthy weight range at my height if I weigh 66kg?
A healthy BMI range (18.5–24.9) means different weights at different heights. For example, at 5ft 6in, healthy weight is roughly 50–68kg. At 5ft 9in, it's 54–75kg. Your GP can advise on a healthy target weight for you personally.
What if my BMI is 25 or higher at 66kg?
If 66kg puts you into the overweight or obese category, small lifestyle changes can help. Losing just 5–10% of body weight often improves health markers. Track your progress with our free progress tracker, or speak to your GP about weight management support options.
Why does BMI change based on height when weight stays the same?
BMI measures weight relative to height (weight in kg ÷ height in metres squared). Taller people distribute the same weight over a larger frame, resulting in a lower BMI. This is why 66kg is healthy at 5ft 9in but overweight at 5ft 0in.
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.