Stone to kilograms – and kilograms to stone

From

To6.3502932

1 st = 6.3502932 kg

Formula

Multiply the value in stone by 6.3502932 to get kilograms.
kg = st × 6.3502932

Multiply the value in kilograms by 0.15747304 to get stone.
st = kg × 0.15747304

How to convert stone to kilograms

Type a value in the field above and the result is calculated instantly. Use the arrow button to swap direction, or pick other units from the lists.

Doing it in your head

A rough conversion for when the calculator is not to hand. The error comes last, and it holds in both directions at that order of magnitude.

Stone to kilograms: × 6 + 5%. That gives 6.3 instead of 6.35029, an error of 0.79%.
Kilograms to stone: ÷ 6 − 5%. That gives 0.1583 instead of 0.157473, an error of 0.55%.

Stone to kilograms – common values

Stone (st)	Kilograms (kg)
1	6.35029
2	12.7006
5	31.7515
10	63.5029
20	127.006
50	317.515
100	635.029
250	1,587.57
500	3,175.15
1,000	6,350.29

Kilograms to stone – common values

Kilograms (kg)	Stone (st)
1	0.157473
2	0.314946
5	0.787365
10	1.57473
20	3.14946
50	7.87365
100	15.7473
250	39.3683
500	78.7365
1,000	157.473

Weight in stone and pounds to kilograms

Stone and pounds	Kilograms (kg)
7 st 0 lb	44.5
7 st 7 lb	47.6
8 st 0 lb	50.8
8 st 7 lb	54
9 st 0 lb	57.2
9 st 7 lb	60.3
10 st 0 lb	63.5
10 st 7 lb	66.7
11 st 0 lb	69.9
11 st 7 lb	73
12 st 0 lb	76.2
12 st 7 lb	79.4
13 st 0 lb	82.6
13 st 7 lb	85.7
14 st 0 lb	88.9
14 st 7 lb	92.1
15 st 0 lb	95.3
15 st 7 lb	98.4
16 st 0 lb	101.6
16 st 7 lb	104.8
17 st 0 lb	108
17 st 7 lb	111.1
18 st 0 lb	114.3
18 st 7 lb	117.5
19 st 0 lb	120.7
19 st 7 lb	123.8
20 st 0 lb	127

Weight in kilograms to stone and pounds

Kilograms (kg)	Stone and pounds
44	6 st 13 lb
46	7 st 3.4 lb
48	7 st 7.8 lb
50	7 st 12.2 lb
52	8 st 2.6 lb
54	8 st 7 lb
56	8 st 11.5 lb
58	9 st 1.9 lb
60	9 st 6.3 lb
62	9 st 10.7 lb
64	10 st 1.1 lb
66	10 st 5.5 lb
68	10 st 9.9 lb
70	11 st 0.3 lb
72	11 st 4.7 lb
74	11 st 9.1 lb
76	11 st 13.6 lb
78	12 st 4 lb
80	12 st 8.4 lb
82	12 st 12.8 lb
84	13 st 3.2 lb
86	13 st 7.6 lb
88	13 st 12 lb
90	14 st 2.4 lb
92	14 st 6.8 lb
94	14 st 11.2 lb
96	15 st 1.6 lb
98	15 st 6.1 lb
100	15 st 10.5 lb
102	16 st 0.9 lb
104	16 st 5.3 lb
106	16 st 9.7 lb
108	17 st 0.1 lb
110	17 st 4.5 lb
112	17 st 8.9 lb
114	17 st 13.3 lb
116	18 st 3.7 lb
118	18 st 8.1 lb
120	18 st 12.6 lb
122	19 st 3 lb
124	19 st 7.4 lb
126	19 st 11.8 lb
128	20 st 2.2 lb

About the units

Stone. A stone is 14 pounds, exactly 6.35029318 kilograms. It survives in British and Irish everyday speech for body weight: an adult of 70 kilograms weighs eleven stone. It is not a legal trade unit in the UK or in the EU, where it may appear only as a supplementary indication. Body weight is written in mixed base, “11 st 4 lb”, with 14 pounds to the stone. Americans do not use the stone at all and count straight through in pounds.

Kilograms. The kilogram is the SI base unit of mass, fixed since 2019 by a defined value for the Planck constant, 6.62607015 × 10⁻³⁴ J s. Before that it was a platinum-iridium cylinder in Paris, sanctioned in 1889 and dropped as the definition in 2018. It is a legal unit across the EU, and US consumer packaging must carry a metric quantity too. A litre of water weighs almost exactly a kilogram. Mass is not weight, and the kilogram is the only base unit whose name carries a prefix.

Other common conversions

Kilograms ↔ pounds Grams ↔ ounces All units in this category