Stone to Kilograms

Convert stone to kilograms with the exact 6.35029318 kg factor, a stone-pounds-kilo triple table and the pounds alongside, in your browser. Runs entirely in your browser — your numbers never leave this device.

Value in stone

Stone → Kilograms

69.853225 kg

11 st = 69.853225 kg — also 154 lb

Stone to kilograms — 5 to 20 stone

Stone	Kilograms
5 st	31.751466 kg
5.5 st	34.926612 kg
6 st	38.101759 kg
6.5 st	41.276906 kg
7 st	44.452052 kg
7.5 st	47.627199 kg
8 st	50.802345 kg
8.5 st	53.977492 kg
9 st	57.152639 kg
9.5 st	60.327785 kg
10 st	63.502932 kg
10.5 st	66.678078 kg
11 st	69.853225 kg
11.5 st	73.028372 kg
12 st	76.203518 kg
12.5 st	79.378665 kg
13 st	82.553811 kg
13.5 st	85.728958 kg
14 st	88.904105 kg
14.5 st	92.079251 kg
15 st	95.254398 kg
15.5 st	98.429544 kg
16 st	101.604691 kg
16.5 st	104.779837 kg
17 st	107.954984 kg
17.5 st	111.130131 kg
18 st	114.305277 kg
18.5 st	117.480424 kg
19 st	120.65557 kg
19.5 st	123.830717 kg
20 st	127.005864 kg

Batch convert — one value per line

How it works

Kilograms = stone × 6.35029318 (because 1 stone = 14 lb exactly and 1 lb = 0.45359237 kg exactly); the converter also shows stone × 14 = pounds

Stone to kilograms, with pounds: the triple table

Stone	Pounds	Kilograms
5 st	70 lb	31.75 kg
6 st	84 lb	38.10 kg
7 st	98 lb	44.45 kg
8 st	112 lb	50.80 kg
9 st	126 lb	57.15 kg
10 st	140 lb	63.50 kg
11 st	154 lb	69.85 kg
12 st	168 lb	76.20 kg
12.5 st	175 lb	79.38 kg
14 st	196 lb	88.90 kg
15 st	210 lb	95.25 kg
20 st	280 lb	127.01 kg

The stone is exactly 14 pounds, and the pound is exactly 0.45359237 kg, so one stone is 14 × 0.45359237 = 6.35029318 kg, exactly. Stone to kilograms is a single multiplication: 11 stone is 11 × 6.35029318 = 69.8532 kg — the familiar pairing, since 11 stone is also exactly 154 lb. This page shows the pounds figure alongside the kilograms, because stone is almost always spoken and checked against pounds first.

Body weight is nearly the only place the stone survives, which creates its characteristic trap: weights arrive as stone plus pounds, such as 10 stone 7 lb, and the pounds part is not a decimal. Combine first — 10 stone 7 lb is 10.5 stone, or 147 lb — then convert: 147 × 0.45359237 = 66.6781 kg. Entering 10.7 stone instead would give 67.95 kg, overstating the weight by well over a kilogram.

The table gives the triple — stone, pounds, kilograms — for the range adult body weights actually occupy, including the half-stone step at 12.5 stone (175 lb, 79.38 kg) because half-stone goals are how weight loss is commonly tracked in the UK. Batch mode applies the same factor to a pasted list of stone values.

Worked examples

A body weight

Input: 11 stone to kilograms.
Working: 11 × 6.35029318 = 69.8532.
Result: 11 stone = 69.85 kg (and exactly 154 lb)

Stone and pounds together

Input: 10 stone 7 lb to kilograms.
Working: Combine first: 10 × 14 + 7 = 147 lb. Then 147 × 0.45359237 = 66.6781.
Result: 10 stone 7 lb = 66.68 kg

The reverse: 80 kg in stone and pounds

Input: 80 kg to stone and pounds.
Working: 80 ÷ 6.35029318 = 12.5978 stone. In pounds: 80 ÷ 0.45359237 = 176.3698 lb, which is 12 whole stone (168 lb) with 8.37 lb left over.
Result: 80 kg = 12 st 8.37 lb

Frequently asked questions

How many kilograms are in a stone?

Exactly 6.35029318, because a stone is exactly 14 lb and a pound is exactly 0.45359237 kg. Every stone-to-kilogram conversion is a multiplication by that figure, and kilograms back to stone is a division by it.

How do I convert stone and pounds, like 12 stone 5 lb?

Combine into one unit first. Either work in pounds — 12 × 14 + 5 = 173 lb, and 173 × 0.45359237 = 78.47 kg — or in decimal stone: 5 lb is 5 ÷ 14 = 0.357 stone, so 12.357 × 6.35029318 = 78.47 kg. What you must not do is read it as 12.5 stone, which would give 79.38 kg.

Why does the converter also show pounds?

Because stone is rarely used alone: scales and charts pair it with pounds, and the anchors are pound-based — 11 stone is exactly 154 lb and 12.5 stone is exactly 175 lb. Showing all three figures lets you check a weight against whichever system the person, form or chart in front of you is using.

Is a stone the same in the UK and the US?

The unit is the same — 14 lb everywhere it is defined — but the US barely uses it. Stone survives mainly in the UK and Ireland for body weight. An American reading of 11 stone usually needs it restated as 154 lb or 69.85 kg, which is exactly the triple this page prints.

How much is half a stone in kilograms?

Half a stone is 7 lb, and 7 × 0.45359237 = 3.1751 kg, displayed as 3.18 kg. Half-stone steps are common weight targets, so the table includes the 12.5 stone row (79.38 kg) between the whole-stone rows.