How Many kg in a Stone? (1 Stone = 6.3503 kg)
Official conversion result, step-by-step mathematical proof, lookup chart, and UK stone & pound weight comparisons.
There are exactly 6.35029318 kilograms in 1 stone. A stone is defined under the 1959 International Agreement as exactly 14 avoirdupois pounds.
1 stone = 14 lbs × 0.45359237 = 6.35029 kgStep-by-Step Worked Solution
Unlike generic automated calculators that display only an isolated number, here is the verifiable mathematical process used to calculate 1 st in kg:
Identify the Conversion Standard
Take the definition of 1 stone: 1 st = 14 avoirdupois pounds.
Apply the Mathematical Formula
Multiply 14 lbs by the exact international factor: 14 × 0.45359237 kg = 6.35029318 kg.
Rounding & Secondary Formats
Common personal body weight benchmarks: 10 stone = 63.50 kg; 11 stone = 69.85 kg; 12 stone = 76.20 kg.
1 Stone = 6.35029 kg (14 lbs)
Formula: 1 st × 6.35029 = 6.3503 kg
Proportional Multipliers for 1 st
Easily scale up or down with standard ratios:
Comprehensive Reference Tools & Charts
To convert stones to kg, multiply by 6.35029318. A 10 stone person weighs 63.50 kg; an 11 stone person weighs 69.85 kg.
Interactive Stone to Kilograms Calculator
Convert any custom number with step-by-step arithmetic and instant decimal control.
Printable Stones to kg Chart (5 to 25 st in 0.5 steps)
Comprehensive UK body weight lookup sheet with exact kilograms and pounds.
Printable Pounds to Stone Chart (70 to 350 lbs)
Fast lookup table converting bathroom scale pounds into stones & pounds.
Related Quick Weight Benchmarks
View All Quick Presets →Instant calculations and conversions for nearby Stone and Kilograms queries:
Frequently Asked Questions: 1 st to kg
1 Stone (st) equals exactly 6.35029318 kg (14 lbs) (rounded to 6.35 kg). Under international metrology standards, this is calculated using the formula: 1 stone = 14 lbs × 0.45359237 = 6.35029 kg.
1 stone equals exactly 14 pounds (1 st 0 lb). In kilograms, this equals 6.35 kg.
For quick mental estimates, multiply or divide using rounded benchmark ratios. For example, 1 stone is roughly 6.35 kg (or 14 lbs); 1 kg is roughly 2.2 lbs; and 1 ounce is roughly 28.35 grams.
This unit standard is governed by the 1959 International Yard and Pound Agreement, BIPM SI standards, and NIST guidelines, universally utilized in healthcare, fitness, aviation luggage, logistics, and cooking.
Measurement Standards & Accuracy
Standard MultipliersFactors based on the 1959 International Yard and Pound Agreement and NIST SP 811.
- BIPM Constant SI Standard
- 1959 International Yard & Pound Agreement
- NIST SP 811