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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What is 66 Kilo in Stone?
66 kilograms is equal to 10 stone and 5.5 pounds (or 10st 5.5lbs). To convert kilograms to stone, divide the kilogram figure by 6.35029 — this gives you the exact stone measurement. Understanding how to convert kg to stone is useful because weight in stone remains the most common way UK adults discuss their weight, even though the NHS uses kilograms for clinical measurements. This guide explains the conversion formula, shows nearby values, and provides health context for this weight at typical UK heights.
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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 to Stone Conversion — Formula and Nearby Values
Exact conversion: 66 kg = 10 stone 5.5 lbs (or 10.39 stone)
The formula to convert any kilogram weight to stone is simple: divide the kilogram amount by 6.35029. For 66 kg: 66 ÷ 6.35029 = 10.39 stone, which equals 10 stone and 5.5 pounds.
Here's a table showing 66 kg alongside nearby weights for quick reference:
- 61 kg = 9st 8.9lbs
- 62 kg = 9st 11.7lbs
- 63 kg = 9st 12.5lbs
- 64 kg = 10st 1.3lbs
- 65 kg = 10st 4.1lbs
- 66 kg = 10st 5.5lbs
- 67 kg = 10st 8.3lbs
- 68 kg = 10st 11.1lbs
- 69 kg = 10st 13.9lbs
- 70 kg = 11st 0.1lbs
- 71 kg = 11st 2.9lbs
Use our free weight converter on this page to switch between metric and imperial measurements instantly.
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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.
66kg BMI and Healthy Weight Context
At 66 kg, your BMI depends entirely on your height. For example, at an average UK height of 1.75 m (5ft 9in), a weight of 66 kg gives a BMI of 21.5 — which falls in the healthy weight range of 18.5 to 24.9 according to NHS guidelines. However, at 1.60 m (5ft 3in), 66 kg gives a BMI of 25.8 — classified as overweight. Calculate your personal BMI using our free BMI calculator above to see where you fall on the NHS scale.
Remember that BMI is a screening tool only and does not account for muscle mass, bone density, or where fat is stored. Your GP can provide personalised guidance about 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.
How do I convert 66kg to stone and pounds easily?
Divide 66 by 6.35029 to get stone. 66 ÷ 6.35029 = 10.39 stone. The decimal (0.39) multiplied by 14 gives the pounds: 0.39 × 14 = 5.5 lbs. So 66kg = 10 stone 5.5 pounds. Use our free weight converter for instant conversions.
Is 66kg a healthy weight?
It depends on your height. At 1.75m (5ft 9in), 66kg is a healthy BMI of 21.5. At 1.60m (5ft 3in), it's 25.8 (overweight). The NHS healthy weight range is BMI 18.5–24.9. Calculate your personal BMI using our free tool above to check where you fall.
What is the formula to convert kilograms to stone?
Divide the kilogram weight by 6.35029. Formula: kg ÷ 6.35029 = stone. For example: 66 ÷ 6.35029 = 10.39 stone. To find pounds: multiply the decimal by 14. This works for any weight value.
How many pounds is 66kg?
66 kilograms equals approximately 145.5 pounds. To convert kg to pounds, multiply the kilogram figure by 2.20462. For example: 66 × 2.20462 = 145.5 lbs. You can also use the weight converter on this page for gradual improvement.
What is the healthy weight range at my height if I weigh 66kg?
At 66kg, your healthy weight range depends on your height. Use our free BMI calculator above to enter your height and see if 66kg falls in the healthy range (BMI 18.5–24.9) for you. If you have South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a slightly lower healthy range (BMI 18.5–22.9).
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.