Stones & Pounds to Kilograms Converter (st to kg)
Convert stones and pounds to kilograms (st & lbs to kg). Enter stones and additional pounds for instant results in kg, grams, and total pounds.
WEIGHT IN KILOGRAMS
63.5 kg
GRAMS
63503 g
TOTAL POUNDS
140 lbs
STONE + LBS
10 st 0 lbs
FORMULA
140 Γ 0.4536
Stones to Kilograms β Reference Table
| Stones | Pounds | Kilograms | Grams |
|---|---|---|---|
| 1 st | 14 lbs | 6.35 kg | 6350 g |
| 2 st | 28 lbs | 12.70 kg | 12701 g |
| 3 st | 42 lbs | 19.05 kg | 19051 g |
| 4 st | 56 lbs | 25.40 kg | 25401 g |
| 5 st | 70 lbs | 31.75 kg | 31751 g |
| 6 st | 84 lbs | 38.10 kg | 38102 g |
| 7 st | 98 lbs | 44.45 kg | 44452 g |
| 8 st | 112 lbs | 50.80 kg | 50802 g |
| 9 st | 126 lbs | 57.15 kg | 57153 g |
| 10 st | 140 lbs | 63.50 kg | 63503 g |
| 12 st | 168 lbs | 76.20 kg | 76204 g |
| 15 st | 210 lbs | 95.25 kg | 95254 g |
| 20 st | 280 lbs | 127.01 kg | 127006 g |
| 30 st | 420 lbs | 190.51 kg | 190509 g |
How to Convert Stones to Kilograms
One stone equals exactly 14 pounds, or 6.350293 kilograms. To convert stones (with optional additional pounds) to kilograms:
Step 2: Convert pounds to kilograms: kg = total lbs Γ 0.453592
Or directly: kg = stone Γ 6.350293
Example: 11 stone 4 lbs = (11 Γ 14) + 4 = 158 lbs = 158 Γ 0.453592 = 71.67 kg
Stones to Kilograms Conversion Chart
Quick reference for common stone-to-kg conversions:
| Stones | Pounds | Kilograms | Approximate BMI Context |
|---|---|---|---|
| 7 st | 98 lbs | 44.45 kg | Lightweight adult |
| 8 st | 112 lbs | 50.80 kg | Small adult |
| 9 st | 126 lbs | 57.15 kg | Average woman (UK) |
| 10 st | 140 lbs | 63.50 kg | β |
| 11 st | 154 lbs | 69.85 kg | Average man (UK) |
| 12 st | 168 lbs | 76.20 kg | β |
| 13 st | 182 lbs | 82.55 kg | Average man (US) |
| 14 st | 196 lbs | 88.90 kg | β |
| 15 st | 210 lbs | 95.25 kg | β |
| 16 st | 224 lbs | 101.61 kg | β |
| 18 st | 252 lbs | 114.31 kg | β |
| 20 st | 280 lbs | 127.01 kg | β |
| 25 st | 350 lbs | 158.76 kg | β |
| 30 st | 420 lbs | 190.51 kg | β |
Stone + Pounds β Common Body Weights
Since body weight is rarely a round number of stones, here are common weights with pounds included:
| Stone & Pounds | Total Pounds | Kilograms |
|---|---|---|
| 8 st 7 lbs | 119 lbs | 53.98 kg |
| 9 st 4 lbs | 130 lbs | 58.97 kg |
| 10 st 0 lbs | 140 lbs | 63.50 kg |
| 10 st 7 lbs | 147 lbs | 66.68 kg |
| 11 st 0 lbs | 154 lbs | 69.85 kg |
| 11 st 7 lbs | 161 lbs | 73.03 kg |
| 12 st 0 lbs | 168 lbs | 76.20 kg |
| 12 st 7 lbs | 175 lbs | 79.38 kg |
| 13 st 0 lbs | 182 lbs | 82.55 kg |
| 14 st 0 lbs | 196 lbs | 88.90 kg |
| 15 st 7 lbs | 217 lbs | 98.43 kg |
What Is a Stone?
The stone (abbreviation: st) is an imperial unit of weight equal to 14 pounds (6.35 kg). It's primarily used in the United Kingdom and Ireland to measure body weight. When a British person says "I weigh 11 stone," they mean 154 pounds (69.85 kg).
The stone has ancient origins β it was historically the weight of a literal stone used as a counterweight on balance scales. Different trades used different "stone" weights until 1824, when the UK Weights and Measures Act standardized it at 14 pounds.
Today, the stone is not recognized in the US, where pounds are used exclusively for body weight. It's also not an official SI unit, but remains deeply embedded in British and Irish culture.
What Is a Kilogram?
The kilogram (abbreviation: kg) is the SI base unit of mass, equal to 1,000 grams or approximately 2.205 pounds. Since 2019, the kilogram has been defined by the Planck constant (replacing the physical platinum-iridium prototype stored in France since 1889).
Kilograms are used worldwide for body weight β except in the US (which uses pounds) and UK/Ireland (which use stones and pounds). Most medical records globally use kilograms.
US vs. UK vs. Metric Weight Systems
- United States: Body weight measured in pounds (lbs). "I weigh 175 pounds."
- United Kingdom & Ireland: Body weight measured in stones & pounds. "I weigh 12 stone 7." (= 175 lbs = 79.4 kg)
- Most other countries: Body weight measured in kilograms. "I weigh 79 kg."
This creates frequent conversion needs when Americans encounter British weight references (TV shows, sports, news), or when filling out international medical forms.
When to Convert Stones to Kilograms
- Understanding British body weight references: UK TV shows, news, and fitness content use stones. "She lost 2 stone" = she lost 28 lbs (12.7 kg).
- Medical and fitness tracking: International health apps and medical records use kilograms. If you know your weight in stones, you need to convert for BMI calculations, medication dosing, or gym programs.
- International travel: Airline baggage limits, visa medical exams, and hotel scales in Europe all use kilograms.
- Combat sports: Boxing and MMA weight classes are listed in pounds in the US but sometimes in stones in the UK (e.g., "welterweight" = 10 st 7 lbs = 147 lbs = 66.7 kg).
- Immigration and visas: Medical examination forms for UK and US visas require weight in specific units β converting between systems is often necessary.