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What is a stone?

Used in the UK and Ireland for human body weight — 14 pounds

Definition

The stone equals 14 pounds or 6.35 kilograms. It is used almost exclusively in the UK and Ireland to express human body weight. A 70 kg person is described as "11 stone" in British English. The stone is not used in trade, science or any other context.

Common uses

  • Human body weight in the UK and Ireland
  • British medical charts and patient records
  • British boxing and wrestling press reports

🌍 Real-world scale

A 70 kg adult is about 11 stone. A British NHS weight chart marks stones alongside kg. A heavyweight boxer over 14 stone is typical.

Convert from stones

11 conversions
Stone to Kilogram1 st = 6.35029 kgStone to Gram1 st = 6,350.29 gStone to Milligram1 st = 6,350,293.18 mgStone to Microgram1 st = 6,350,293,180 µgStone to Pound1 st = 14 lbStone to Ounce1 st = 224 ozStone to Metric Ton1 st = 0.00635 tStone to US Ton1 st = 0.007 ton (US)Stone to UK Ton1 st = 0.00625 ton (UK)Stone to Carat1 st = 31,751.47 ctStone to Grain1 st = 98,000 gr

Convert to stones

11 conversions
Kilogram to Stone1 kg = 0.1575 stGram to Stone1 g = 0.0001575 stMilligram to Stone1 mg = 1.5747e-7 stMicrogram to Stone1 µg = 1.5747e-10 stPound to Stone1 lb = 0.07143 stOunce to Stone1 oz = 0.004464 stMetric Ton to Stone1 t = 157.473 stUS Ton to Stone1 ton (US) = 142.857 stUK Ton to Stone1 ton (UK) = 160 stCarat to Stone1 ct = 3.1495e-5 stGrain to Stone1 gr = 1.0204e-5 st

Tips

  • 1 stone = 14 lb = 6.35 kg exactly.
  • British speakers often say "11 stone 4" meaning 11 stone and 4 pounds — not 11.4 stone.
  • Multiply stones by 6.35 for a precise kg conversion.

Common mistakes

  • Reading "11 stone 4" as 11.4 stone — it is 11 × 14 + 4 = 158 lb.
  • Using stones outside UK/Ireland contexts — audiences elsewhere will not understand.
  • Multiplying by 6 instead of 6.35 for a quick kg estimate — 5% error.

FAQ about the stone

What is a stone?
The stone equals 14 pounds or 6.35 kilograms. It is used almost exclusively in the UK and Ireland to express human body weight. A 70 kg person is described as "11 stone" in British English. The stone is not used in trade, science or any other context.
Where is the stone used?
The stone is commonly used for: Human body weight in the UK and Ireland; British medical charts and patient records; British boxing and wrestling press reports.
What is an example of a stone in real life?
A 70 kg adult is about 11 stone. A British NHS weight chart marks stones alongside kg. A heavyweight boxer over 14 stone is typical.
What category does the stone belong to?
The stone is a unit of weight, part of the 12-unit weight category on UnitConv.
How accurate are stone conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 12 weight units and their conversions.⚖️ Weight hub →