Mass and Weight · Unit Converter

Convert Stone (UK) to Kilogram

Convert stones (uk) to kilograms instantly. 1 stone (uk) = 6.35029318 kilogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kilogram to Stone (UK) converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Dr. Ashok Kumar K, Ph.D.
Mass and Weight category 2 min read Published Last reviewed Updated

Units explained

Avoirdupois

Stone (UK)

What is a stone (uk)?

The UK stone (st) equals 14 pounds, about 6.35 kilograms.

Origin of the stone (uk)

From standardized market 'stones' once used for weighing goods.

Where it is used

Body weight in the United Kingdom and Ireland.

When and where it was developed

Fixed at 14 pounds by British statute in 1835.

Metric / SI

Kilogram

What is a kilogram?

The kilogram (kg) is the SI base unit of mass, defined by fixing the Planck constant h at 6.62607015E-34 J s.

Origin of the kilogram

From Greek 'khilioi' (thousand) plus 'gramma' (small weight).

Where it is used

The worldwide base unit of mass in science, commerce, and everyday life.

When and where it was developed

Adopted in 1795; redefined through the Planck constant on 20 May 2019.

Stone (UK) to Kilogram conversion formula

The relationship between stones (uk) and kilograms:

1 st = 6.35029318 kg
1 kg = 0.1574730444 st

To convert stones (uk) to kilograms, multiply the value in stones (uk) by 6.35029318. To reverse, multiply kilograms by 0.1574730444.

How to use this converter

Type a value into the calculator. The result in kilograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Kilogram to Stone (UK) converter for the reverse direction.

Step-by-step: convert stones (uk) to kilograms

  1. Write down the value in stones (uk) (st).
  2. Multiply that value by the factor 6.35029318.
  3. The product is the equivalent value in kilograms (kg).
  4. To reverse, multiply the kilogram value by 0.1574730444.

Worked examples

Example 1 — Convert 1 st to kg:
1 × 6.35029318 = 6.35029318 kg

Example 2 — Convert 100 st to kg:
100 × 6.35029318 = 635.029318 kg

Real-world example — Reference scenario in case of fallback

Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.

1 st × 6.35029318 = 6.35029318 kg

Real-world example — Adult height conversion

A 1.8-stone (uk)-tall person measures a value in kilograms that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.

1.8 st × 6.35029318 = 11.430527724 kg

Real-world example — Fabric purchase length

Two stones (uk) of fabric equals a value in kilograms essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.

2 st × 6.35029318 = 12.70058636 kg

Stone (UK) to Kilogram conversion table

Standard reference values for converting stones (uk) to kilograms:

Stone (UK) [st]Kilogram [kg]
0.010.0635029318
0.10.635029318
16.35029318
212.70058636
319.05087954
425.40117272
531.7514659
1063.5029318
20127.0058636
30190.5087954
40254.0117272
50317.514659
100635.029318
5003175.14659
10006350.29318

Frequently asked questions

How many kilograms is 1 stone (uk)?
1 stone (uk) equals 6.35029318 kilogram.
How do I convert stones (uk) to kilograms?
Multiply the value in stones (uk) by 6.35029318 to get kilograms.
How do I convert kilograms back to stones (uk)?
Multiply the value in kilograms by 0.1574730444, or use the Kilogram to Stone (UK) converter.
How many kilograms is 100 stones (uk)?
100 stones (uk) equals 635.029318 kilograms, because 100 × 6.35029318 = 635.029318.

Convert Stone (UK) to other weight units

Show all Stone (UK) conversions
Metric / SI (18 units)
Stone (UK) to Attogram (ag) Stone (UK) to Femtogram (fg) Stone (UK) to Picogram (pg) Stone (UK) to Nanogram (ng) Stone (UK) to Microgram (µg) Stone (UK) to Milligram (mg) Stone (UK) to Centigram (cg) Stone (UK) to Decigram (dg) Stone (UK) to Gram (g) Stone (UK) to Dekagram (dag) Stone (UK) to Hectogram (hg) Stone (UK) to Kilogram (kg) Stone (UK) to Quintal (metric) (q) Stone (UK) to Metric Ton (t) Stone (UK) to Gigagram (Gg) Stone (UK) to Teragram (Tg) Stone (UK) to Petagram (Pg) Stone (UK) to Exagram (Eg)
Avoirdupois (14 units)
Stone (UK) to Grain (gr) Stone (UK) to Dram (avoirdupois) (dr) Stone (UK) to Ounce (oz) Stone (UK) to Pound (lb) Stone (UK) to Clove (clove) Stone (UK) to Stone (US) (st) Stone (UK) to Quarter (US) (qr) Stone (UK) to Quarter (UK) (qr) Stone (UK) to Hundredweight (US) (cwt) Stone (UK) to Hundredweight (UK) (cwt) Stone (UK) to Wey (wey) Stone (UK) to Kilopound (kip) (kip) Stone (UK) to Ton (short, US) (sh tn) Stone (UK) to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Stone (UK) to Point (1/100 carat) (pt) Stone (UK) to Carat (metric) (ct) Stone (UK) to Scruple (apothecary) (s ap) Stone (UK) to Pennyweight (dwt) Stone (UK) to Momme (mom) Stone (UK) to Mace (mace) Stone (UK) to Dram (apothecary/troy) (dr ap) Stone (UK) to Troy Ounce (oz t) Stone (UK) to Tael (tael) Stone (UK) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Stone (UK) to Ratti (ratti) Stone (UK) to Masha (masha) Stone (UK) to Tola (tola) Stone (UK) to Chittack (Chatank) (chittack) Stone (UK) to Seer (Ser) (seer) Stone (UK) to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Stone (UK) to Electron Mass (rest) (me) Stone (UK) to MeV/c2 (MeV/c²) Stone (UK) to Muon Mass (mµ) Stone (UK) to Atomic Mass Unit (u) Stone (UK) to Proton Mass (mp) Stone (UK) to Neutron Mass (mn) Stone (UK) to Deuteron Mass (md) Stone (UK) to Carbon-12 Atom Mass (C-12) Stone (UK) to Planck Mass (mP)
Astronomical (4 units)
Stone (UK) to Lunar Mass (Moon) (M☾) Stone (UK) to Earth's Mass (M⊕) Stone (UK) to Jupiter Mass (MJ) Stone (UK) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Stone (UK) to Lepton (Biblical Roman) (lepton) Stone (UK) to Quadrans (Biblical Roman) (quadrans) Stone (UK) to Assarion (Biblical Roman) (assarion) Stone (UK) to Gerah (Biblical Hebrew) (gerah) Stone (UK) to Drachma (Biblical Greek) (drachma) Stone (UK) to Denarius (Biblical Roman) (denarius) Stone (UK) to Bekan (Biblical Hebrew) (bekah) Stone (UK) to Didrachma (Biblical Greek) (didrachma) Stone (UK) to Shekel (Biblical Hebrew) (shekel) Stone (UK) to Tetradrachma (Biblical Greek) (tetra) Stone (UK) to Mina (Biblical Greek) (mina) Stone (UK) to Mina (Biblical Hebrew) (mina) Stone (UK) to Talent (Biblical Greek) (talent) Stone (UK) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Stone (UK) to Poundal (pdl) Stone (UK) to Ton (assay) (US) (AT) Stone (UK) to Ton (assay) (UK) (AT) Stone (UK) to Kilogram-force square second/meter (hyl) Stone (UK) to Slug (slug)

Sources & references

Conversion factor (1 st = 6.35029318 kg) verified against the following authoritative sources:

Results are provided for general reference. Verify critical measurements against an authoritative standard.