Mass and Weight · Unit Converter

Convert Ounce to Ton (assay) (US)

Convert ounces to tons (assay) (us) instantly. 1 ounce = 0.9719835381 ton (assay) (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ton (assay) (US) to Ounce 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

Ounce

What is a ounce?

The (avoirdupois) ounce (oz) equals one-sixteenth of a pound, about 28.35 grams.

Origin of the ounce

From Latin 'uncia', meaning a twelfth part.

Where it is used

US food portions, postal weights, and boxing weight classes.

When and where it was developed

Standardized as 1/16 of the international pound from 1959.

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.

Ounce to Ton (assay) (US) conversion formula

The relationship between ounces and tons (assay) (us):

1 oz = 0.9719835381 AT
1 AT = 1.0288240087 oz

To convert ounces to tons (assay) (us), multiply the value in ounces by 0.9719835381. To reverse, multiply tons (assay) (us) by 1.0288240087.

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 Ounce converter for the reverse direction.

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

  1. Write down the value in ounces (oz).
  2. Multiply that value by the factor 0.9719835381.
  3. The product is the equivalent value in tons (assay) (us) (AT).
  4. To reverse, multiply the ton (assay) (us) value by 1.0288240087.

Worked examples

Example 1 — Convert 1 oz to AT:
1 × 0.9719835381 = 0.9719835381 AT

Example 2 — Convert 100 oz to AT:
100 × 0.9719835381 = 97.1983538059 AT

Real-world example — Postcard and small-object dimensions

A postcard is about 5 ounces wide. Converting to tons (assay) (us) is essential for international postal addressing forms that ask for dimensions in different units across countries.

5 oz × 0.9719835381 = 4.8599176903 AT

Real-world example — Ruler-scale measurements

A 30-ounce school ruler converts cleanly to tons (assay) (us) — useful when buying a desk accessory from a retailer whose product specs use a different unit.

30 oz × 0.9719835381 = 29.1595061418 AT

Real-world example — Hardware-scale dimensions

A 10-ounce fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between ounces and tons (assay) (us) daily when mixing metric and imperial tools.

10 oz × 0.9719835381 = 9.7198353806 AT

Ounce to Ton (assay) (US) conversion table

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

Ounce [oz]Ton (assay) (US) [AT]
0.010.0097198354
0.10.0971983538
10.9719835381
21.9439670761
32.9159506142
43.8879341522
54.8599176903
109.7198353806
2019.4396707612
3029.1595061418
4038.8793415224
5048.599176903
10097.1983538059
500485.9917690295
1000971.983538059

Frequently asked questions

How many tons (assay) (us) is 1 ounce?
1 ounce equals 0.9719835381 ton (assay) (us).
How do I convert ounces to tons (assay) (us)?
Multiply the value in ounces by 0.9719835381 to get tons (assay) (us).
How do I convert tons (assay) (us) back to ounces?
Multiply the value in tons (assay) (us) by 1.0288240087, or use the Ton (assay) (US) to Ounce converter.
How many tons (assay) (us) is 100 ounces?
100 ounces equals 97.1983538059 tons (assay) (us), because 100 × 0.9719835381 = 97.1983538059.

Convert Ounce to other weight units

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

Sources & references

Conversion factor (1 oz = 0.9719835381 AT) verified against the following authoritative sources:

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