Mass and Weight · Unit Converter

Convert Stone (UK) to Ton (assay) (US)

Convert stones (uk) to tons (assay) (us) instantly. 1 stone (uk) = 217.7243127172 ton (assay) (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ton (assay) (US) 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.

Force / Engineering

Ton (assay) (US)

What is a ton (assay) (us)?

The assay ton (US) equals about 29.167 grams, a mining-assay convenience unit.

Origin of the ton (assay) (us)

Devised so an assay sample's metal in milligrams reads as troy ounces per short ton.

Where it is used

Ore assaying and metallurgy.

When and where it was developed

Adopted in assay laboratories to simplify ore-grade calculation.

Stone (UK) to Ton (assay) (US) conversion formula

The relationship between stones (uk) and tons (assay) (us):

1 st = 217.7243127172 AT
1 AT = 0.0045929643 st

To convert stones (uk) to tons (assay) (us), multiply the value in stones (uk) by 217.7243127172. To reverse, multiply tons (assay) (us) by 0.0045929643.

How to use this converter

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

Step-by-step: convert stones (uk) to tons (assay) (us)

  1. Write down the value in stones (uk) (st).
  2. Multiply that value by the factor 217.7243127172.
  3. The product is the equivalent value in tons (assay) (us) (AT).
  4. To reverse, multiply the ton (assay) (us) value by 0.0045929643.

Worked examples

Example 1 — Convert 1 st to AT:
1 × 217.7243127172 = 217.7243127172 AT

Example 2 — Convert 100 st to AT:
100 × 217.7243127172 = 21772.4312717221 AT

Real-world example — Pet and accessory dimensions

A 3-stone (uk) dog leash equals a tidy round value in tons (assay) (us). Pet-supply shopping frequently mixes the two units across product specifications.

3 st × 217.7243127172 = 653.1729381517 AT

Real-world example — Fabric and tailoring

One stone (uk) of fabric converts to a value in tons (assay) (us) commonly used for seam allowances. Garment patterns frequently switch between the two units on a single instruction sheet.

1 st × 217.7243127172 = 217.7243127172 AT

Real-world example — Body height conversion (reverse direction)

You measure 1.75 stones (uk) tall and need to fill in a gym membership form or medical record that asks for height in tons (assay) (us). This is the most-used everyday length conversion in metric-using countries.

1.75 st × 217.7243127172 = 381.0175472551 AT

Stone (UK) to Ton (assay) (US) conversion table

Standard reference values for converting stones (uk) to tons (assay) (us):

Stone (UK) [st]Ton (assay) (US) [AT]
0.012.1772431272
0.121.7724312717
1217.7243127172
2435.4486254344
3653.1729381517
4870.8972508689
51088.6215635861
102177.2431271722
204354.4862543444
306531.7293815166
408708.9725086889
5010886.2156358611
10021772.4312717221
500108862.1563586107
1000217724.3127172214

Frequently asked questions

How many tons (assay) (us) is 1 stone (uk)?
1 stone (uk) equals 217.7243127172 ton (assay) (us).
How do I convert stones (uk) to tons (assay) (us)?
Multiply the value in stones (uk) by 217.7243127172 to get tons (assay) (us).
How do I convert tons (assay) (us) back to stones (uk)?
Multiply the value in tons (assay) (us) by 0.0045929643, or use the Ton (assay) (US) to Stone (UK) converter.
How many tons (assay) (us) is 100 stones (uk)?
100 stones (uk) equals 21772.4312717221 tons (assay) (us), because 100 × 217.7243127172 = 21772.4312717221.

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 = 217.7243127172 AT) verified against the following authoritative sources:

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