Mass and Weight · Unit Converter

Convert Grain to Scruple (apothecary)

Convert grains to scruples (apothecary) instantly. 1 grain = 0.0499999923 scruple (apothecary) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Scruple (apothecary) 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.

Troy & Apothecary

Scruple (apothecary)

What is a scruple (apothecary)?

The apothecary scruple equals 20 grains, about 1.296 grams.

Origin of the scruple (apothecary)

From Latin 'scrupulus', a small sharp pebble used as a tiny weight.

Where it is used

Historical apothecary dosing of powders.

When and where it was developed

Part of the apothecaries' system used through the 19th century.

Grain to Scruple (apothecary) conversion formula

The relationship between grains and scruples (apothecary):

1 gr = 0.0499999923 s ap
1 s ap = 20.0000030865 gr

To convert grains to scruples (apothecary), multiply the value in grains by 0.0499999923. To reverse, multiply scruples (apothecary) by 20.0000030865.

How to use this converter

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

Step-by-step: convert grains to scruples (apothecary)

  1. Write down the value in grains (gr).
  2. Multiply that value by the factor 0.0499999923.
  3. The product is the equivalent value in scruples (apothecary) (s ap).
  4. To reverse, multiply the scruple (apothecary) value by 20.0000030865.

Worked examples

Example 1 — Convert 1 gr to s ap:
1 × 0.0499999923 = 0.0499999923 s ap

Example 2 — Convert 100 gr to s ap:
100 × 0.0499999923 = 4.9999992284 s ap

Real-world example — Packaging gauge

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

4 gr × 0.0499999923 = 0.1999999691 s ap

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 scruples (apothecary) aligns the value with the unit most CAD systems and material datasheets prefer.

500 gr × 0.0499999923 = 24.9999961419 s ap

Grain to Scruple (apothecary) conversion table

Standard reference values for converting grains to scruples (apothecary):

Grain [gr]Scruple (apothecary) [s ap]
0.010.0004999999
0.10.0049999992
10.0499999923
20.0999999846
30.1499999769
40.1999999691
50.2499999614
100.4999999228
200.9999998457
301.4999997685
401.9999996914
502.4999996142
1004.9999992284
50024.9999961419
100049.9999922838

Frequently asked questions

How many scruples (apothecary) is 1 grain?
1 grain equals 0.0499999923 scruple (apothecary).
How do I convert grains to scruples (apothecary)?
Multiply the value in grains by 0.0499999923 to get scruples (apothecary).
How do I convert scruples (apothecary) back to grains?
Multiply the value in scruples (apothecary) by 20.0000030865, or use the Scruple (apothecary) to Grain converter.
How many scruples (apothecary) is 100 grains?
100 grains equals 4.9999992284 scruples (apothecary), because 100 × 0.0499999923 = 4.9999992284.

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 = 0.0499999923 s ap) verified against the following authoritative sources:

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