Stone and Pounds to Kg Converter (st & lb to kg)
Convert stone (st) and pounds (lb) into kilograms (kg) instantly using the official UK and NHS conversion standard. Fast, accurate, mobile-friendly, and completely free.
Popular Weights
Quick Conversion Facts
- 1 Stone = 14 Pounds
- 1 Stone = 6.35029318 Kilograms
- 1 Pound = 0.45359237 Kilograms
- Uses the official UK & NHS conversion standard.
What Is a Stone and Pounds to Kg Converter?
A Stone and Pounds to Kg Converter is a simple weight conversion tool that changes a weight entered in stones (st) and pounds (lb) into kilograms (kg). It uses the official international conversion values, making it useful for everyday measurements, fitness tracking, medical records, and travel. Instead of calculating the conversion manually, the tool gives an accurate result instantly.
A stone is a traditional British unit of weight equal to 14 pounds, while a pound (lb) is an imperial unit commonly used in the United Kingdom and the United States. A kilogram (kg) is the standard metric unit of mass used by most countries worldwide. Because different countries use different systems, many people need to convert between these units when reading health records, using fitness apps, or comparing body weight.
The United Kingdom still commonly measures personal body weight in stones and pounds, even though kilograms are the official metric unit. Many healthcare professionals, including the NHS, may display or reference both metric and imperial measurements so patients can easily understand their weight. This is why accurate stone-to-kilogram conversion is important.
Our Stone and Pounds to Kg Converter provides fast, precise results using the official conversion standard, helping you convert weight confidently without manual calculations or complex formulas.
How to Use Our Stone and Pounds to Kg Converter
Convert your weight in seconds by following these four simple steps. The calculator updates automatically as you type, giving you an accurate kilogram (kg) result using the official UK conversion standard.
Enter Stones
Type the whole number of stones (st) into the first input field. This is the main weight unit commonly used across the UK.
Add Pounds
Enter any remaining pounds (lb). Leave this field as zero if your weight is measured only in whole stones.
Instant Kg Result
The calculator automatically converts your weight into kilograms (kg) using the official conversion formula with no extra clicks.
Copy & Use
Copy your converted weight with one click and use it for NHS forms, fitness tracking, travel documents, or everyday calculations.
Stone and Pounds to Kilograms Conversion Formula
Understanding the conversion formula helps you verify every result and makes it easier to convert weight manually whenever needed. Our calculator follows the official international conversion standard used by healthcare professionals, fitness experts, and UK weight references.
st & lb to kg Formula
1 Stone = 14 Pounds
A stone is an Imperial unit of weight that always contains exactly 14 pounds. This fixed relationship is why UK body weight is commonly written as stones and pounds together.
Pounds Are Converted Separately
After converting the stone value into kilograms, any remaining pounds are converted separately using 0.45359237 kg per pound. Both values are then added together for an accurate result.
International Standard
The calculator uses the internationally accepted conversion constants recognized across medical, scientific, and engineering applications. This ensures reliable results every time.
Common Stone and Pounds to Kilograms Conversions
Find the most searched UK weight conversions instantly. Each card shows the equivalent weight in kilograms and a common real-world reference.
Stone and Pounds to Kilograms Conversion Table
Search any value from 1–25 stone with 0–13 pounds. Copy any conversion instantly.
| Stone | Pounds | Kilograms | Copy |
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Stone, Pounds, and Kilograms Conversion Examples
Wondering what common UK body weights look like in kilograms? These examples show how whole stones and remaining pounds combine to give the final weight in kilograms using the official international conversion standard.
How to Read These Examples
Each weight is made of whole stones plus any remaining pounds. The converter first changes the stone value into kilograms, then converts the extra pounds separately before adding both values together. This gives an accurate kilogram result that matches the international conversion standard used by healthcare professionals, fitness apps, and scientific calculations.
Why Use Our Stone and Pounds to Kg Calculator?
Designed for speed, accuracy, and simplicity, our calculator helps you convert UK weight measurements into kilograms instantly using internationally accepted conversion standards.
Instant Conversion
Convert stone and pounds into kilograms immediately while you type. No waiting or extra clicks.
Accurate Calculations
Uses the official conversion values of 1 stone = 6.35029318 kg and 1 pound = 0.45359237 kg.
NHS-Friendly Format
Perfect for comparing your weight with NHS guidance, BMI tools, and healthcare information.
International Standard
Follows internationally recognised metric conversion standards for consistent and reliable results.
Mobile Optimized
Works smoothly on phones, tablets, laptops, and desktop computers without horizontal scrolling.
Free Forever
Unlimited conversions with no subscriptions, hidden costs, or premium upgrades.
Copy Results
Copy your converted weight with one tap and paste it anywhere you need.
Live Calculations
Your kilogram result updates automatically whenever you change the stone or pounds value.
No Registration
Use the calculator instantly without creating an account or sharing personal information.
Works on All Devices
Compatible with Android, iPhone, Windows, Mac, Chromebooks, and all modern web browsers.
Everything You Need in One Calculator
Whether you’re checking your NHS weight, tracking your fitness progress, completing medical forms, or converting UK body weight into kilograms, this calculator delivers fast, accurate, and reliable results using official conversion standards. It is built to be simple for beginners while remaining accurate enough for everyday health and fitness use.
Conclusion
Converting stone and pounds to kilograms doesn’t have to be complicated. Whether you’re checking your NHS weight record, tracking fitness progress, preparing for travel, or comparing measurements from different countries, this calculator provides fast and reliable results in seconds.
Simply enter your stone and remaining pounds, and the calculator instantly converts your weight into kilograms (kg) using the official international conversion standard of 1 stone = 6.35029318 kg and 1 pound = 0.45359237 kg. You also receive accurate results suitable for everyday use, health records, gym tracking, and educational purposes.
Along with the calculator, this page includes conversion formulas, worked examples, searchable tables, and answers to common questions, making it easy to understand how the calculation works instead of only seeing the final number.
Bookmark this Stone and Pounds to Kg Converter whenever you need a quick, accurate, and mobile-friendly weight conversion. Whether you’re converting 10 stone 7 pounds, 14 stone, or any other weight, you’ll always get precise kilogram results based on internationally accepted measurement standards.
Frequently Asked Questions
Find quick answers about converting stone and pounds to kilograms, UK weight measurements, NHS weight units, and international conversion standards.
One stone equals exactly 6.35029318 kilograms. This is the official international conversion value used by the UK, NHS guidance, healthcare professionals, and scientific calculations. To convert stone into kilograms, multiply the number of stones by 6.35029318.
There are 14 pounds (lb) in one stone (st). This relationship has been used in the British Imperial system for centuries and is still commonly used in the UK and Ireland when measuring body weight.
Multiply the number of stones by 6.35029318, multiply the remaining pounds by 0.45359237, then add both values together.
Formula:
kg = (Stone × 6.35029318) + (Pounds × 0.45359237)
10 stone equals 63.50 kg (63.5029 kg before rounding). This is one of the most commonly searched UK weight conversions.
10 stone 7 pounds equals approximately 66.68 kg. The converter combines both the stone value and the remaining pounds to provide an accurate kilogram result.
11 stone 6 pounds equals approximately 73.48 kg. This weight is frequently used in NHS health records and BMI calculations.
14 stone equals 88.90 kilograms. The precise conversion is 88.9041 kg before rounding to two decimal places.
The stone is part of the traditional British Imperial system and is still widely used across the UK and Ireland for measuring body weight. Although kilograms are the official SI unit, many people, fitness professionals, and some NHS resources continue to use stone and pounds because they are familiar and easier for everyday conversations.
Yes. This calculator uses the internationally accepted conversion constants:
- 1 stone = 6.35029318 kg
- 1 pound = 0.45359237 kg
Results are calculated instantly and are suitable for everyday, medical, fitness, and educational use.
Yes. If your NHS letter, BMI record, or medical report lists your weight in stone and pounds, simply enter both values into this calculator. You’ll receive an accurate kilogram result that matches international metric standards.