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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Converting Litres to Pounds — UK Guide
Litres and pounds measure different things — litres measure liquid volume, while pounds measure weight. If you're looking to convert weight measurements, you'll want to convert kilograms or stones to pounds instead. For UK health purposes like BMI calculations or weight tracking, we use kilograms, stones, and pounds. This guide clarifies the difference and shows you the correct conversions for weight management and health tracking in the UK.
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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.
Understanding Litres vs Pounds
Litres are units of volume — they measure how much space a liquid or gas takes up. Pounds are units of weight or mass. You cannot directly convert litres to pounds because they measure different physical properties. However, you can convert litres to pounds if you know the density of the substance being measured — for example, 1 litre of water weighs approximately 2.2 pounds, but 1 litre of oil weighs less because oil is less dense than water.
- 1 litre of water ≈ 2.2 lbs (1 kg)
- 1 litre of milk ≈ 2.2 lbs (slightly denser than water)
- 1 litre of oil ≈ 1.9 lbs (less dense than water)
For UK health and weight tracking, you'll need weight conversions: use our free weight converter above to switch between kilograms, stones, and pounds — the measurements used by the NHS and UK health professionals.
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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.
Weight Conversions for UK Health
If you're tracking your weight or calculating your BMI, you need weight measurements, not volume. The UK uses three main weight units: kilograms (kg), stones, and pounds (lbs). Use our free BMI calculator above to check your healthy weight range — the NHS recommends a BMI between 18.5 and 24.9 for most UK adults. For weight management, understanding your weight in kg, stone, and lbs is essential. Our weight converter tool lets you instantly switch between all three units to match whichever format your GP, health plan, or fitness tracker uses.
- 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.
Can you convert litres directly to pounds?
No — litres measure volume, pounds measure weight. You need the density of the substance. Water is the exception: 1 litre of water weighs approximately 2.2 pounds. For other liquids, the weight differs because density varies. To convert weight (not volume), use kilograms, stones, or pounds instead.
What's the difference between litres and pounds?
Litres measure how much space a liquid takes up (volume). Pounds measure how heavy something is (weight). They're completely different measurements. In UK health contexts, we use weight measurements like kilograms, stones, and pounds — never litres — for BMI calculations and weight tracking.
What weight units does the UK use for health?
The UK uses kilograms (kg) for clinical measurements and stones and pounds for everyday weight. The NHS uses both kg and stone/lbs. Use our free weight converter above to switch between them instantly for your health records, BMI calculations, or weight loss tracking.
How do I find my healthy weight range in the UK?
Calculate your BMI using our free BMI calculator on this page — it works in UK measurements (stone and kg). The NHS recommends a healthy BMI of 18.5 to 24.9. Your GP can provide personalised advice based on your individual health and circumstances.
Is 1 litre of water always 2.2 pounds?
Yes — 1 litre of water weighs approximately 2.2 pounds (1 kg) at standard temperature and pressure. However, other liquids have different densities, so their weight per litre varies. For weight tracking in health contexts, always use weight units (kg, stone, lbs) — never volume measurements.
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.