Mass and Weight · Unit Converter

Convert Microgram to Ton (assay) (US)

Convert micrograms to tons (assay) (us) instantly. 1 microgram = 3.428571e-8 ton (assay) (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ton (assay) (US) to Microgram 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 June 10, 2026 Last reviewed June 10, 2026 Updated June 10, 2026

Units explained

Metric / SI

Microgram

What is a microgram?

A microgram (ug) equals 10^-9 kilogram, or one-millionth of a gram.

Origin of the microgram

From the SI prefix 'micro-' (from Greek 'mikros', small).

Where it is used

Trace nutrients, potent drug doses, and environmental contaminant levels.

When and where it was developed

The micro- prefix was incorporated into the SI in 1960.

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.

Microgram to Ton (assay) (US) conversion formula

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

1 µg = 3.428571e-8 AT

1 AT = 2.916667e+7 µg

To convert micrograms to tons (assay) (us), multiply the value in micrograms by 3.428571e-8. To reverse, multiply tons (assay) (us) by 2.916667e+7.

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 Microgram converter for the reverse direction.

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

Write down the value in micrograms (µg).
Multiply that value by the factor 3.428571e-8.
The product is the equivalent value in tons (assay) (us) (AT).
To reverse, multiply the ton (assay) (us) value by 2.916667e+7.

Worked examples

Example 1 — Convert 1 µg to AT:
1 × 3.428571e-8 = 3.428571e-8 AT

Example 2 — Convert 100 µg to AT:
100 × 3.428571e-8 = 3.428571e-6 AT

Real-world example — Sub-micron to millimeter

500,000 micrograms converts to a small everyday quantity in tons (assay) (us) — useful when relating optical-wavelength specifications to physical mounting hardware.

500000 µg × 3.428571e-8 = 0.0171428552 AT

Real-world example — From wavelengths to millimeter-scale objects

A value of one million micrograms sounds vast at the atomic scale but converts to a small everyday quantity in tons (assay) (us) — useful when relating optical-wavelength specifications to physical mounting hardware.

1000000 µg × 3.428571e-8 = 0.0342857104 AT

Microgram to Ton (assay) (US) conversion table

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

Microgram [µg]	Ton (assay) (US) [AT]
0.01	3.428571e-10
0.1	3.428571e-9
1	3.428571e-8
2	6.857142e-8
3	1.028571e-7
4	1.371428e-7
5	1.714286e-7
10	3.428571e-7
20	6.857142e-7
30	1.028571e-6
40	1.371428e-6
50	1.714286e-6
100	3.428571e-6
500	1.714286e-5
1000	3.428571e-5

Frequently asked questions

How many tons (assay) (us) is 1 microgram?

1 microgram equals 3.428571e-8 ton (assay) (us).

How do I convert micrograms to tons (assay) (us)?

Multiply the value in micrograms by 3.428571e-8 to get tons (assay) (us).

How do I convert tons (assay) (us) back to micrograms?

Multiply the value in tons (assay) (us) by 2.916667e+7, or use the Ton (assay) (US) to Microgram converter.

How many tons (assay) (us) is 100 micrograms?

100 micrograms equals 3.428571e-6 tons (assay) (us), because 100 × 3.428571e-8 = 3.428571e-6.

Convert Microgram to other weight units

Show all Microgram conversions

Metric / SI (17 units)

Microgram to Attogram (ag) Microgram to Femtogram (fg) Microgram to Picogram (pg) Microgram to Nanogram (ng) Microgram to Milligram (mg) Microgram to Centigram (cg) Microgram to Decigram (dg) Microgram to Gram (g) Microgram to Dekagram (dag) Microgram to Hectogram (hg) Microgram to Kilogram (kg) Microgram to Quintal (metric) (q) Microgram to Metric Ton (t) Microgram to Gigagram (Gg) Microgram to Teragram (Tg) Microgram to Petagram (Pg) Microgram to Exagram (Eg)

Avoirdupois (15 units)

Microgram to Grain (gr) Microgram to Dram (avoirdupois) (dr) Microgram to Ounce (oz) Microgram to Pound (lb) Microgram to Clove (clove) Microgram to Stone (US) (st) Microgram to Stone (UK) (st) Microgram to Quarter (US) (qr) Microgram to Quarter (UK) (qr) Microgram to Hundredweight (US) (cwt) Microgram to Hundredweight (UK) (cwt) Microgram to Wey (wey) Microgram to Kilopound (kip) (kip) Microgram to Ton (short, US) (sh tn) Microgram to Ton (long, UK) (long tn)

Troy & Apothecary (10 units)

Microgram to Point (1/100 carat) (pt) Microgram to Carat (metric) (ct) Microgram to Scruple (apothecary) (s ap) Microgram to Pennyweight (dwt) Microgram to Momme (mom) Microgram to Mace (mace) Microgram to Dram (apothecary/troy) (dr ap) Microgram to Troy Ounce (oz t) Microgram to Tael (tael) Microgram to Pound (troy/apothecary) (lb t)

Indian / South Asian (6 units)

Microgram to Ratti (ratti) Microgram to Masha (masha) Microgram to Tola (tola) Microgram to Chittack (Chatank) (chittack) Microgram to Seer (Ser) (seer) Microgram to Maund (Mann) (maund)

Scientific / Atomic (9 units)

Microgram to Electron Mass (rest) (me) Microgram to MeV/c2 (MeV/c²) Microgram to Muon Mass (mµ) Microgram to Atomic Mass Unit (u) Microgram to Proton Mass (mp) Microgram to Neutron Mass (mn) Microgram to Deuteron Mass (md) Microgram to Carbon-12 Atom Mass (C-12) Microgram to Planck Mass (mP)

Astronomical (4 units)

Microgram to Lunar Mass (Moon) (M☾) Microgram to Earth's Mass (M⊕) Microgram to Jupiter Mass (MJ) Microgram to Sun's Mass (M☉)

Biblical / Ancient (14 units)

Microgram to Lepton (Biblical Roman) (lepton) Microgram to Quadrans (Biblical Roman) (quadrans) Microgram to Assarion (Biblical Roman) (assarion) Microgram to Gerah (Biblical Hebrew) (gerah) Microgram to Drachma (Biblical Greek) (drachma) Microgram to Denarius (Biblical Roman) (denarius) Microgram to Bekan (Biblical Hebrew) (bekah) Microgram to Didrachma (Biblical Greek) (didrachma) Microgram to Shekel (Biblical Hebrew) (shekel) Microgram to Tetradrachma (Biblical Greek) (tetra) Microgram to Mina (Biblical Greek) (mina) Microgram to Mina (Biblical Hebrew) (mina) Microgram to Talent (Biblical Greek) (talent) Microgram to Talent (Biblical Hebrew) (talent)

Force / Engineering (5 units)

Microgram to Poundal (pdl) Microgram to Ton (assay) (US) (AT) Microgram to Ton (assay) (UK) (AT) Microgram to Kilogram-force square second/meter (hyl) Microgram to Slug (slug)

Sources & references

Conversion factor (1 µg = 3.428571e-8 AT) verified against the following authoritative sources:

BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.

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