Mass and Weight · Unit Converter

Convert Grain to Ton (assay) (US)

Convert grains to tons (assay) (us) instantly. 1 grain = 0.0022216763 ton (assay) (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ton (assay) (US) to Grain 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

Grain

What is a grain?

The grain (gr) equals 1/7000 of an avoirdupois pound, about 64.8 milligrams.

Origin of the grain

Based on the nominal mass of a single barley grain.

Where it is used

Ammunition and bullet mass, archery, and historical pharmacy.

When and where it was developed

Standardized through the English avoirdupois system and retained in 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.

Grain to Ton (assay) (US) conversion formula

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

1 gr = 0.0022216763 AT
1 AT = 450.1105728647 gr

To convert grains to tons (assay) (us), multiply the value in grains by 0.0022216763. To reverse, multiply tons (assay) (us) by 450.1105728647.

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 Grain converter for the reverse direction.

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

  1. Write down the value in grains (gr).
  2. Multiply that value by the factor 0.0022216763.
  3. The product is the equivalent value in tons (assay) (us) (AT).
  4. To reverse, multiply the ton (assay) (us) value by 450.1105728647.

Worked examples

Example 1 — Convert 1 gr to AT:
1 × 0.0022216763 = 0.0022216763 AT

Example 2 — Convert 100 gr to AT:
100 × 0.0022216763 = 0.2221676318 AT

Real-world example — Packaging gauge

A 4-grain plastic bag thickness is a common spec for grocery and freezer bags. Converting from grains to tons (assay) (us) is what packaging buyers do whenever they bridge US and metric supplier quotes.

4 gr × 0.0022216763 = 0.0088867053 AT

Real-world example — Plastic film and laminate thickness

A 500-grain sheet is a typical spec for ID-card laminates and film overlays. Converting to tons (assay) (us) aligns the value with the unit most CAD systems and material datasheets prefer.

500 gr × 0.0022216763 = 1.1108381588 AT

Grain to Ton (assay) (US) conversion table

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

Grain [gr]Ton (assay) (US) [AT]
0.012.221676e-5
0.10.0002221676
10.0022216763
20.0044433526
30.006665029
40.0088867053
50.0111083816
100.0222167632
200.0444335264
300.0666502895
400.0888670527
500.1110838159
1000.2221676318
5001.1108381588
10002.2216763175

Frequently asked questions

How many tons (assay) (us) is 1 grain?
1 grain equals 0.0022216763 ton (assay) (us).
How do I convert grains to tons (assay) (us)?
Multiply the value in grains by 0.0022216763 to get tons (assay) (us).
How do I convert tons (assay) (us) back to grains?
Multiply the value in tons (assay) (us) by 450.1105728647, or use the Ton (assay) (US) to Grain converter.
How many tons (assay) (us) is 100 grains?
100 grains equals 0.2221676318 tons (assay) (us), because 100 × 0.0022216763 = 0.2221676318.

Convert Grain to other weight units

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

Sources & references

Conversion factor (1 gr = 0.0022216763 AT) verified against the following authoritative sources:

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