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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Kilo to KG — Understanding the Same Unit
"Kilo" and "kg" refer to exactly the same unit of measurement — the kilogram. There is no conversion between them because they are identical. Both terms are used interchangeably in the UK, though "kg" is the official abbreviation. Understanding this distinction helps when using UK health information, NHS guidance, and weight management tools. If you're tracking your weight or calculating your BMI, knowing that kilo and kg are the same removes any confusion about units.
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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.
Why the Confusion Between Kilo and KG?
The confusion arises because "kilo" is the full word and "kg" is its abbreviation — they describe the identical SI unit of mass. In everyday UK conversation, people often say "kilo" (e.g., "I weigh 75 kilos"), whilst official measurements and health documents use "kg" (e.g., "75 kg"). Both are correct. The NHS, clinical guidelines, and health calculators use "kg" as standard, but you'll hear both terms used interchangeably. Some people also use the informal British term "kilos" as a plural. When reading UK health advice, weight management information, or using our free weight converter tool, "kg" and "kilo" always mean the same thing — no mathematical conversion is required. This is different from converting between entirely different units, such as kilograms to stone or kilograms to pounds.
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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.
How KG Fits Into UK Weight and Health Measurements
In the UK, whilst many people still use stone and pounds for body weight conversations, the NHS and all clinical measurements use kilograms (kg). Your BMI is calculated using your weight in kg and height in metres. Prescription weight management medications like Mounjaro and Wegovy are dosed based on body weight, which healthcare professionals record in kg. When you use our free BMI calculator, enter your weight in kg for accurate results. NHS guidance, NICE recommendations, and all medical records use kg exclusively. Understanding that "kilo" and "kg" are the same unit ensures you never misinterpret health advice or clinical information.
- 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.
Is kilo the same as kg?
Yes, completely. "Kilo" is the full word and "kg" is its standard abbreviation. They refer to the identical SI unit of mass (kilogram). Both terms are correct and used interchangeably in the UK, though "kg" is the official abbreviation used by the NHS and health documents.
Why do people say "kilo" instead of "kg"?
It's simply informal, conversational language. In everyday UK speech, people say "I weigh 75 kilos" — but on medical forms and health records, the same measurement is written "75 kg". Both are correct; one is formal, one is casual.
How does kg relate to stone and pounds in the UK?
Kilograms (kg) is the metric unit used by the NHS and clinical systems. Stone and pounds are the traditional imperial units many UK people still use informally. 1 kg equals approximately 0.157 stone, or 2.205 pounds. Use our free weight converter to switch between kg, stone, and pounds instantly.
What unit does the NHS use for weight measurements?
The NHS exclusively uses kilograms (kg) for all clinical measurements, medical records, and health guidance. When your GP records your weight or healthcare professionals assess your health, they use kg as the standard unit.
Do I need to convert kilo to kg for my BMI calculation?
No. Since kilo and kg are identical, there's no conversion needed. Simply enter your weight in kg (or kilo — they're the same) into our free BMI calculator above, along with your height in centimetres, and get your result instantly.
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.