Stone to Kg Converter
Convert Between Stone, Kilograms & Pounds Instantly
Stone to Kilograms
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Kilograms to Stone
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Instant Conversion: Results update automatically as you type. No need to click any buttons!
Quick Reference Table
| Stone (st) | Kilograms (kg) | Pounds (lbs) | Context |
|---|---|---|---|
| 8 st | 50.80 kg | 112 lb | Lightweight |
| 9 st | 57.15 kg | 126 lb | Lower Healthy Range |
| 10 st | 63.50 kg | 140 lb | Average Range |
| 11 st | 69.85 kg | 154 lb | Average Range |
| 12 st | 76.20 kg | 168 lb | Above Average |
| 13 st | 82.55 kg | 182 lb | Heavier Build |
| 14 st | 88.90 kg | 196 lb | Approx 90kg |
| 15 st | 95.25 kg | 210 lb | Nearing 100kg |
| 16 st | 101.60 kg | 224 lb | Over 100kg |
Stone to Kg Converter: Complete Guide to Weight Conversion
Instantly convert between stone, kilograms, and pounds with our accurate calculator. Essential for health tracking, medical purposes, and fitness goals.
Understanding Stone and Kilogram Measurements
What is a Kilogram?
The kilogram (kg) is the base unit of mass in the International System of Units (SI), used globally in science, medicine, and commerce.
- • Global standard for weight measurement
- • Decimal-based system (grams, milligrams)
- • Used in 95% of countries worldwide
- • Essential for medical dosages and BMI calculations
What is a Stone?
The stone (st) is an Imperial unit used primarily in the UK and Ireland for body weight measurement.
- • 1 stone = 14 pounds (lbs)
- • 1 stone ≈ 6.35029 kilograms
- • Compound unit system (stone + pounds)
- • Cultural tradition in Britain
Why Accurate Conversion Matters
Healthcare & Medical Safety
Medication dosages are calculated based on weight in kilograms. NHS and medical professionals use kg for patient records. Conversion errors could lead to dangerous dosage mistakes.
Fitness & Sports Performance
Gym equipment uses kilograms globally. Fitness apps default to metric. Weight classes in sports are defined in kg. Accurate conversion is crucial for tracking progress.
International Travel & Communication
When traveling or communicating internationally, understanding both measurement systems prevents confusion and ensures accurate information sharing.
Conversion Formulas
Stone to Kilograms
kg = (stone × 6.35029318) + (pounds × 0.45359237)
Example: 10 stone 5 pounds = (10 × 6.35029) + (5 × 0.45359) = 65.77 kg
Kilograms to Stone
total_pounds = kg ÷ 0.45359237
stone = floor(total_pounds ÷ 14)
pounds = total_pounds % 14
Example: 65 kg = 143.3 pounds = 10 stone 3.3 pounds
Common Conversion Scenarios
Weight Loss Tracking
"I want to lose 2 stone" = 12.7 kg. This helps set realistic gym targets and track progress in metric measurements used by most fitness equipment.
Medical Appointments
Doctor asks for weight in kg? Convert your stone measurement accurately for proper BMI calculation and medication dosage.
Sports Competitions
Weight classes in boxing, MMA, and weightlifting use kg. Know exactly which category you fit into with precise conversion.
Important Notes
- • Always use precise conversion factors for medical purposes
- • Rounding can lead to significant errors over time
- • Professional medical advice should not rely solely on online converters
- • For medication dosages, consult healthcare professionals
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Frequently Asked Questions
Is 'Stone' used in the USA?
No. This is a common misconception. While the USA uses the Imperial system (pounds and ounces), they do not use the stone. An American will state their weight as '160 pounds,' whereas a British person would say '11 stone 6 pounds.' This unique usage is specific to the UK and Ireland.
How do I convert Stone to Kg manually?
If you are without a calculator, follow this two-step process: Convert to Pounds: Multiply your stone value by 14 and add any extra pounds. (e.g., 10 st 5 lbs = 145 lbs). Divide by 2.2: Divide the total pounds by 2.20462. (e.g., 145 ÷ 2.20462 ≈ 65.77 kg).
Why do gyms use Kilograms?
The International Weightlifting Federation (IWF) and the International Powerlifting Federation (IPF) use metric standards. To keep equipment standardized globally, manufacturers produce plates and dumbbells in kilograms.
What is the abbreviation for Stone?
The correct abbreviation is 'st'. Note that the plural is also usually written as 'st' or simply spoken as stone (e.g., '10 stone', not '10 stones').
How accurate is this converter?
Our converter uses precise conversion factors (1 stone = 6.35029318 kg, 1 pound = 0.45359237 kg) for maximum accuracy. It's suitable for most health and fitness purposes, though medical applications should always consult professionals.
Can I convert decimal stone values?
Yes! You can enter decimal values for both stone and pounds. For example, 10.5 stone or 5.7 pounds. The calculator will handle these accurately.