Stone to Kilogram Converter

Convert stones to kilograms for metric weight conversions. Perfect for UK body weight, fitness tracking, and international measurements.

Enter Weight in Stones

Also Include Pounds

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Converted Weight

0 kg

Also Equals

Enter a value above to see the conversion

Enter Weight in Kilograms

→

Converted Weight

0 st

Also Equals

Enter a value above to see the conversion

Quick Reference: Stones to Kilograms

Stones (st)	Kilograms (kg)	Pounds (lbs)
1 st	6.35 kg	14 lbs
2 st	12.70 kg	28 lbs
3 st	19.05 kg	42 lbs
4 st	25.40 kg	56 lbs
5 st	31.75 kg	70 lbs
6 st	38.10 kg	84 lbs
7 st	44.45 kg	98 lbs
8 st	50.80 kg	112 lbs
9 st	57.15 kg	126 lbs
10 st	63.50 kg	140 lbs
11 st	69.85 kg	154 lbs
12 st	76.20 kg	168 lbs
13 st	82.55 kg	182 lbs
14 st	88.90 kg	196 lbs
15 st	95.25 kg	210 lbs
16 st	101.60 kg	224 lbs
17 st	107.95 kg	238 lbs
18 st	114.31 kg	252 lbs
19 st	120.66 kg	266 lbs
20 st	127.01 kg	280 lbs
25 st	158.76 kg	350 lbs
30 st	190.51 kg	420 lbs

About the Stone to Kilogram Converter

Our Stone to Kilogram Converter is a specialized weight conversion tool designed for people who need to convert between British imperial stones and metric kilograms. Whether you're tracking your body weight, working in healthcare, or simply need to understand UK weight measurements, this converter provides fast, accurate results.

The stone (st) is a traditional British unit of weight commonly used in the United Kingdom and Ireland for measuring body weight. One stone equals 14 pounds or approximately 6.35 kilograms. While most of the world uses kilograms, the stone remains the standard unit for personal weight measurement in the UK.

Conversion Formula

Stones to Kilograms:
kilograms = stones × 6.35029318
(including pounds: kg = stones × 6.35029318 + pounds × 0.45359237)

Kilograms to Stones:
stones = kilograms ÷ 6.35029318
(remainder in pounds: lbs = remainder × 14)

Body Weight: 10 Stones

10 st × 6.35 = 63.50 kg

A common body weight. 10 stones converts to approximately 63.5 kilograms.

Body Weight: 12 Stone 6 lbs

12 st 6 lbs = 12 × 6.35 + 6 × 0.454 = 78.93 kg

Converting stones and pounds to kilograms gives a precise metric measurement.

Metric to Imperial: 75 kg

75 kg ÷ 6.35 = 11.81 st = 11 st 11.3 lbs

Converting from kilograms back to stones and pounds for UK weight understanding.

How to Use This Converter

Converting Stones to Kilograms

Simply enter the number of stones in the first input field. If you have additional pounds (e.g., 10 stone 6 pounds), enter the pounds in the second field. Click "Convert to Kilograms" or press Enter to see the result. The converter also shows the equivalent in pounds and grams for your convenience.

Converting Kilograms to Stones

Switch to the "Kilograms → Stones" tab and enter your weight in kilograms. The tool will show you the equivalent in stones and the remaining pounds. This is particularly useful when reading UK weight measurements or filling out forms that require stones and pounds.

💡 Tip: In the UK, body weight is commonly expressed as "X stone Y pounds" (e.g., 11 stone 4 pounds). Use the additional pounds field in the Stones → Kilograms tab for the most accurate conversion.

Common Use Cases

🏥

Healthcare & Medical

Medical professionals in the UK need to convert patient weights between stones and kilograms for medical records, medication dosages, and international collaboration.

🏋️

Fitness & Body Weight

Track your body weight in both stones (UK) and kilograms (metric) for fitness goals, weight loss programs, and health monitoring.

🌍

International Travel

When traveling between the UK and metric countries, quickly convert your weight for gym memberships, medical forms, or sports participation.

📊

Data & Research

Researchers and data analysts working with UK health data often need to convert weight measurements from stones to kilograms for analysis.

🛒

Online Shopping

Some UK-based online stores and services may ask for weight in stones when you're used to kilograms, or vice versa.

📝

Forms & Applications

Government forms, insurance applications, and medical questionnaires may require weight in either stones or kilograms depending on the country.

Frequently Asked Questions (FAQ)

How many kilograms are in one stone?

One stone is equal to 6.35029318 kilograms (approximately 6.35 kg). This is the internationally accepted conversion factor. For quick mental conversion, multiply stones by 6.35 to get kilograms, or divide kilograms by 6.35 to get stones.

Why is the stone still used as a unit of weight?

The stone remains the standard unit for measuring body weight in the United Kingdom and Ireland due to tradition and cultural preference. While most of the world uses kilograms, the British public is accustomed to thinking of their weight in stones and pounds. Medical professionals in the UK often use both systems depending on the context.

How do I convert stones and pounds to kilograms?

To convert stones and pounds to kilograms, first convert the stones to kilograms (stones × 6.35029318), then convert the pounds to kilograms (pounds × 0.45359237), and add the two results together. Our converter does this automatically — just enter the stones in the first field and the additional pounds in the second field.

What is the difference between a stone and a kilogram?

A stone (st) is a British imperial unit of weight equal to 14 pounds (6.35 kg). It is primarily used for measuring body weight in the UK and Ireland. A kilogram (kg) is the base unit of mass in the metric system, used by most countries worldwide. Kilograms are part of the International System of Units (SI) and are used in scientific, medical, and everyday contexts globally.

What is 70 kg in stones and pounds?

70 kilograms is approximately 11 stone 0.3 pounds. More precisely: 70 ÷ 6.35029318 = 11.023 stones. The decimal portion (0.023) multiplied by 14 pounds gives 0.3 pounds. So 70 kg = 11 stone 0.3 lbs, commonly rounded to 11 stone for everyday use.

Is the stone used in any countries besides the UK?

The stone is primarily used in the United Kingdom and Ireland for body weight measurement. It was historically used in many Commonwealth countries, but most have now officially adopted the metric system. However, older generations in countries like Australia, New Zealand, and Canada may still refer to weight in stones informally. The United States does not use the stone as a standard unit.

How many stones is 100 kg?

100 kilograms is equal to approximately 15 stone 10.5 pounds. The calculation: 100 ÷ 6.35029318 = 15.747 stones. The decimal (0.747) × 14 = 10.46 pounds. So 100 kg = 15 stone 10.5 lbs. This is a common reference point for those tracking weight loss or comparing international weight standards.

Can I convert stone to kg using mental math?

Yes! For quick mental conversions, remember that 1 stone ≈ 6.35 kg. A useful approximation is to multiply stones by 6 and add a quarter of that result (e.g., 10 stone: 10 × 6 = 60, plus 60/4 = 15, total ≈ 75 kg). The exact result is 63.5 kg, so this overestimates slightly. For better accuracy, multiply by 6.35. Our calculator provides precise results for any value.

Disclaimer: While we strive to ensure the accuracy of all conversions using internationally accepted standards, this tool is provided for general use. For critical applications in healthcare, legal, or commercial contexts, please verify results with appropriate professional standards or consultation.