Stones Conversion

Scales are used to measure weight

The stone is a unit used to measure weight. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about stones.

Stone Conversion Calculators

Choose a unit of weight to convert to.

US Customary & Imperial Units
SI Units

Stone Definition and Usage

One stone is equal to 14 pounds and is mostly used in the United Kingdom and Ireland as a unit of mass. It's most commonly used to measure personal body weight.[1]

The stone is an imperial unit of weight. Stones can be abbreviated as st; for example, 1 stone can be written as 1 st.

How Much is a Stone?

If you're here then there's a good chance you might be wondering just how much is a stone? The chart below shows how much a stone is in other measures of weight.

Common stone values and equivalent imperial and metric weight measurements
stones tons pounds ounces metric tons long tons kilograms grams milligrams carats
1 st 0.007 t 14 lb 224 oz 0.00635 t 0.00625 lt 6.350293 kg 6,350 g 6,350,293 mg 31,751 ct
2 st 0.014 t 28 lb 448 oz 0.012701 t 0.0125 lt 12.700586 kg 12,701 g 12,700,586 mg 63,503 ct
3 st 0.021 t 42 lb 672 oz 0.019051 t 0.01875 lt 19.05088 kg 19,051 g 19,050,880 mg 95,254 ct
4 st 0.028 t 56 lb 896 oz 0.025401 t 0.025 lt 25.401173 kg 25,401 g 25,401,173 mg 127,006 ct
5 st 0.035 t 70 lb 1,120 oz 0.031751 t 0.03125 lt 31.751466 kg 31,751 g 31,751,466 mg 158,757 ct
6 st 0.042 t 84 lb 1,344 oz 0.038102 t 0.0375 lt 38.101759 kg 38,102 g 38,101,759 mg 190,509 ct
7 st 0.049 t 98 lb 1,568 oz 0.044452 t 0.04375 lt 44.452052 kg 44,452 g 44,452,052 mg 222,260 ct
8 st 0.056 t 112 lb 1,792 oz 0.050802 t 0.05 lt 50.802345 kg 50,802 g 50,802,345 mg 254,012 ct
9 st 0.063 t 126 lb 2,016 oz 0.057153 t 0.05625 lt 57.152639 kg 57,153 g 57,152,639 mg 285,763 ct
10 st 0.07 t 140 lb 2,240 oz 0.063503 t 0.0625 lt 63.502932 kg 63,503 g 63,502,932 mg 317,515 ct
11 st 0.077 t 154 lb 2,464 oz 0.069853 t 0.06875 lt 69.853225 kg 69,853 g 69,853,225 mg 349,266 ct
12 st 0.084 t 168 lb 2,688 oz 0.076204 t 0.075 lt 76.203518 kg 76,204 g 76,203,518 mg 381,018 ct
13 st 0.091 t 182 lb 2,912 oz 0.082554 t 0.08125 lt 82.553811 kg 82,554 g 82,553,811 mg 412,769 ct
14 st 0.098 t 196 lb 3,136 oz 0.088904 t 0.0875 lt 88.904105 kg 88,904 g 88,904,105 mg 444,521 ct
15 st 0.105 t 210 lb 3,360 oz 0.095254 t 0.09375 lt 95.254398 kg 95,254 g 95,254,398 mg 476,272 ct
16 st 0.112 t 224 lb 3,584 oz 0.101605 t 0.1 lt 101.604691 kg 101,605 g 101,604,691 mg 508,023 ct
17 st 0.119 t 238 lb 3,808 oz 0.107955 t 0.10625 lt 107.954984 kg 107,955 g 107,954,984 mg 539,775 ct
18 st 0.126 t 252 lb 4,032 oz 0.114305 t 0.1125 lt 114.305277 kg 114,305 g 114,305,277 mg 571,526 ct
19 st 0.133 t 266 lb 4,256 oz 0.120656 t 0.11875 lt 120.65557 kg 120,656 g 120,655,570 mg 603,278 ct
20 st 0.14 t 280 lb 4,480 oz 0.127006 t 0.125 lt 127.005864 kg 127,006 g 127,005,864 mg 635,029 ct

References

  1. National Institute of Standards and Technology, Handbook 44 - 2012 - Appendix B, https://www.nist.gov/system/files/documents/2017/04/28/AppB-12-hb44-final.pdf