Stone to Kilogram Converter
Weight · unit-converter
Convert Stone to Kilogram with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Stone (st)
To: Kilogram (kg)
About Stone
The stone is 14 pounds (UK and Ireland). It is often used for human body weight in those regions.
About Kilogram
The kilogram is the SI base unit of mass (defined via fundamental constants). Everyday metric weights and science use kilograms and grams.
How to convert stone to kilograms
1 stone is equal to 6.35029318 kilogram:
1 st = (6350.29318 g ÷ 1000 g) kg = 6.35029318 kg
Each stone is defined as 6350.29318 g and each kilogram as 1000 g, so one st equals 6350.29318 ÷ 1000 kg = 6.35029318 kg.
Let w(st) be the numeric value of the same mass measured in Stone (st), and w(kg) the value in Kilogram (kg). Then:
w(kg) = w(st) × (6350.29318 / 1000)
Equivalently, divide by how many st fit into one kg (grams per kg divided by grams per st):
w(kg) = w(st) ÷ 0.15747304441777
Or: kilogram = stone ÷ 0.15747304441777
Examples
Example #1: Convert 20 st to kilogram
20 st = 20 st × (6350.29318/1000) kg = 127.0058636 kg
20 st = 20 st ÷ 0.15747304441777 = 127.0058636 kg
Example #2: Convert 50 st to kilogram
50 st = 50 st × (6350.29318/1000) kg = 317.514659 kg
50 st = 50 st ÷ 0.15747304441777 = 317.514659 kg
Summary
To convert Stone to Kilogram, multiply the value in st by the ratio of grams per st divided by grams per kg. Equivalently: value_kg = value_st × (6350.29318 / 1000). Numerically, 1 st equals 6.3502931799999995 kg.
Relationship context
You are converting between imperial / UK (stone, long ton, pound, ounce) (Stone) and metric (SI) (Kilograms). Metric mass is decimal from the gram; US and imperial masses use pounds and ounces with fixed definitions relative to the kilogram. The numeric factor used here is 6.350293e+0.
Conversion tables
| Stone (st) | Kilogram (kg) |
|---|---|
| 0.1 | 0.635029318 |
| 1 | 6.35029318 |
| 2 | 12.70058636 |
| 3 | 19.05087954 |
| 4 | 25.40117272 |
| 5 | 31.7514659 |
| 6 | 38.10175908 |
| 7 | 44.45205226 |
| 8 | 50.80234544 |
| 9 | 57.15263862 |
| Stone (st) | Kilogram (kg) |
|---|---|
| 10 | 63.5029318 |
| 20 | 127.0058636 |
| 30 | 190.5087954 |
| 40 | 254.0117272 |
| 50 | 317.514659 |
| 60 | 381.0175908 |
| 70 | 444.5205226 |
| 80 | 508.0234544 |
| 90 | 571.5263862 |
| 100 | 635.029318 |