Mass and Weight · Unit Converter

Convert Grain to Quarter (US)

Convert grains to quarters (us) instantly. 1 grain = 5.714285e-6 quarter (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Quarter (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.

Avoirdupois

Quarter (US)

What is a quarter (us)?

The US quarter equals one-fourth of a short hundredweight, 25 pounds (about 11.34 kg).

Origin of the quarter (us)

A 'quarter' of the US short hundredweight.

Where it is used

US agricultural and commodity weighing.

When and where it was developed

Defined within the US customary hundredweight system.

Grain to Quarter (US) conversion formula

The relationship between grains and quarters (us):

1 gr = 5.714285e-6 qr
1 qr = 175000.0270066313 gr

To convert grains to quarters (us), multiply the value in grains by 5.714285e-6. To reverse, multiply quarters (us) by 175000.0270066313.

How to use this converter

Type a value into the calculator. The result in quarters (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 Quarter (US) to Grain converter for the reverse direction.

Step-by-step: convert grains to quarters (us)

  1. Write down the value in grains (gr).
  2. Multiply that value by the factor 5.714285e-6.
  3. The product is the equivalent value in quarters (us) (qr).
  4. To reverse, multiply the quarter (us) value by 175000.0270066313.

Worked examples

Example 1 — Convert 1 gr to qr:
1 × 5.714285e-6 = 5.714285e-6 qr

Example 2 — Convert 100 gr to qr:
100 × 5.714285e-6 = 0.0005714285 qr

Real-world example — Plastic-film thickness alternates

A 150-grain plastic film converts cleanly to quarters (us) — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.

150 gr × 5.714285e-6 = 0.0008571427 qr

Real-world example — Hair-width scale measurements

A 70-grain measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like quarters (us) for direct comparison across supplier datasheets.

70 gr × 5.714285e-6 = 0.0003999999 qr

Real-world example — Paper and film thicknesses

At the thickness of office paper (roughly 3 grains), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.

3 gr × 5.714285e-6 = 1.714285e-5 qr

Grain to Quarter (US) conversion table

Standard reference values for converting grains to quarters (us):

Grain [gr]Quarter (US) [qr]
0.015.714285e-8
0.15.714285e-7
15.714285e-6
21.142857e-5
31.714285e-5
42.285714e-5
52.857142e-5
105.714285e-5
200.0001142857
300.0001714285
400.0002285714
500.0002857142
1000.0005714285
5000.0028571424
10000.0057142848

Frequently asked questions

How many quarters (us) is 1 grain?
1 grain equals 5.714285e-6 quarter (us).
How do I convert grains to quarters (us)?
Multiply the value in grains by 5.714285e-6 to get quarters (us).
How do I convert quarters (us) back to grains?
Multiply the value in quarters (us) by 175000.0270066313, or use the Quarter (US) to Grain converter.
How many quarters (us) is 100 grains?
100 grains equals 0.0005714285 quarters (us), because 100 × 5.714285e-6 = 0.0005714285.

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 = 5.714285e-6 qr) verified against the following authoritative sources:

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