Mass and Weight · Unit Converter

Convert Attogram to Grain

Convert attograms to grains instantly. 1 attogram = 1.543236e-17 grain — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Grain to Attogram 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

Metric / SI

Attogram

What is a attogram?

An attogram (ag) equals 10^-21 kilogram.

Origin of the attogram

From the SI prefix 'atto-' (from Danish 'atten', eighteen).

Where it is used

Frontier nanoscience and single-molecule mass detection.

When and where it was developed

The atto- prefix was adopted by the CGPM in 1975.

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.

Attogram to Grain conversion formula

The relationship between attograms and grains:

1 ag = 1.543236e-17 gr
1 gr = 6.47989e+16 ag

To convert attograms to grains, multiply the value in attograms by 1.543236e-17. To reverse, multiply grains by 6.47989e+16.

How to use this converter

Type a value into the calculator. The result in grains updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Grain to Attogram converter for the reverse direction.

Step-by-step: convert attograms to grains

  1. Write down the value in attograms (ag).
  2. Multiply that value by the factor 1.543236e-17.
  3. The product is the equivalent value in grains (gr).
  4. To reverse, multiply the grain value by 6.47989e+16.

Worked examples

Example 1 — Convert 1 ag to gr:
1 × 1.543236e-17 = 1.543236e-17 gr

Example 2 — Convert 100 ag to gr:
100 × 1.543236e-17 = 1.543236e-15 gr

Real-world example — Sub-visible-light wavelength

500 attograms (the green-yellow visible band) equals 0.5 grains — the canonical conversion in optics between wavelength specifications and micron-scale lens-coating thicknesses.

500 ag × 1.543236e-17 = 7.71618e-15 gr

Real-world example — Spanning sub-micron to micron scale

Crossing from attograms to grains is the everyday workflow of microscopy and semiconductor engineering — a measurement of 1000 attograms translates to a much more compact value in grains that fits the scale of biological cells and process nodes.

1000 ag × 1.543236e-17 = 1.543236e-14 gr

Attogram to Grain conversion table

Standard reference values for converting attograms to grains:

Attogram [ag]Grain [gr]
0.011.543236e-19
0.11.543236e-18
11.543236e-17
23.086472e-17
34.629708e-17
46.172944e-17
57.71618e-17
101.543236e-16
203.086472e-16
304.629708e-16
406.172944e-16
507.71618e-16
1001.543236e-15
5007.71618e-15
10001.543236e-14

Frequently asked questions

How many grains is 1 attogram?
1 attogram equals 1.543236e-17 grain.
How do I convert attograms to grains?
Multiply the value in attograms by 1.543236e-17 to get grains.
How do I convert grains back to attograms?
Multiply the value in grains by 6.47989e+16, or use the Grain to Attogram converter.
How many grains is 100 attograms?
100 attograms equals 1.543236e-15 grains, because 100 × 1.543236e-17 = 1.543236e-15.

Convert Attogram to other weight units

Show all Attogram conversions
Metric / SI (17 units)
Attogram to Femtogram (fg) Attogram to Picogram (pg) Attogram to Nanogram (ng) Attogram to Microgram (µg) Attogram to Milligram (mg) Attogram to Centigram (cg) Attogram to Decigram (dg) Attogram to Gram (g) Attogram to Dekagram (dag) Attogram to Hectogram (hg) Attogram to Kilogram (kg) Attogram to Quintal (metric) (q) Attogram to Metric Ton (t) Attogram to Gigagram (Gg) Attogram to Teragram (Tg) Attogram to Petagram (Pg) Attogram to Exagram (Eg)
Avoirdupois (15 units)
Attogram to Grain (gr) Attogram to Dram (avoirdupois) (dr) Attogram to Ounce (oz) Attogram to Pound (lb) Attogram to Clove (clove) Attogram to Stone (US) (st) Attogram to Stone (UK) (st) Attogram to Quarter (US) (qr) Attogram to Quarter (UK) (qr) Attogram to Hundredweight (US) (cwt) Attogram to Hundredweight (UK) (cwt) Attogram to Wey (wey) Attogram to Kilopound (kip) (kip) Attogram to Ton (short, US) (sh tn) Attogram to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Attogram to Point (1/100 carat) (pt) Attogram to Carat (metric) (ct) Attogram to Scruple (apothecary) (s ap) Attogram to Pennyweight (dwt) Attogram to Momme (mom) Attogram to Mace (mace) Attogram to Dram (apothecary/troy) (dr ap) Attogram to Troy Ounce (oz t) Attogram to Tael (tael) Attogram to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Attogram to Ratti (ratti) Attogram to Masha (masha) Attogram to Tola (tola) Attogram to Chittack (Chatank) (chittack) Attogram to Seer (Ser) (seer) Attogram to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Attogram to Electron Mass (rest) (me) Attogram to MeV/c2 (MeV/c²) Attogram to Muon Mass (mµ) Attogram to Atomic Mass Unit (u) Attogram to Proton Mass (mp) Attogram to Neutron Mass (mn) Attogram to Deuteron Mass (md) Attogram to Carbon-12 Atom Mass (C-12) Attogram to Planck Mass (mP)
Astronomical (4 units)
Attogram to Lunar Mass (Moon) (M☾) Attogram to Earth's Mass (M⊕) Attogram to Jupiter Mass (MJ) Attogram to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Attogram to Lepton (Biblical Roman) (lepton) Attogram to Quadrans (Biblical Roman) (quadrans) Attogram to Assarion (Biblical Roman) (assarion) Attogram to Gerah (Biblical Hebrew) (gerah) Attogram to Drachma (Biblical Greek) (drachma) Attogram to Denarius (Biblical Roman) (denarius) Attogram to Bekan (Biblical Hebrew) (bekah) Attogram to Didrachma (Biblical Greek) (didrachma) Attogram to Shekel (Biblical Hebrew) (shekel) Attogram to Tetradrachma (Biblical Greek) (tetra) Attogram to Mina (Biblical Greek) (mina) Attogram to Mina (Biblical Hebrew) (mina) Attogram to Talent (Biblical Greek) (talent) Attogram to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Attogram to Poundal (pdl) Attogram to Ton (assay) (US) (AT) Attogram to Ton (assay) (UK) (AT) Attogram to Kilogram-force square second/meter (hyl) Attogram to Slug (slug)

Sources & references

Conversion factor (1 ag = 1.543236e-17 gr) verified against the following authoritative sources:

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