Mass and Weight · Unit Converter

Convert Grain to Poundal

Convert grains to poundals instantly. 1 grain = 0.0045999993 poundal — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Poundal 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

Poundal

What is a poundal?

The poundal (pdl) is the FPS absolute unit of force; its mass-equivalent on this scale is about 0.0141 kg.

Origin of the poundal

Defined in the foot-pound-second absolute system in the late 19th century.

Where it is used

Early 20th-century physics and engineering.

When and where it was developed

Introduced in the absolute FPS system as an alternative to gravitational units.

Grain to Poundal conversion formula

The relationship between grains and poundals:

1 gr = 0.0045999993 pdl
1 pdl = 217.3913384332 gr

To convert grains to poundals, multiply the value in grains by 0.0045999993. To reverse, multiply poundals by 217.3913384332.

How to use this converter

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

Step-by-step: convert grains to poundals

  1. Write down the value in grains (gr).
  2. Multiply that value by the factor 0.0045999993.
  3. The product is the equivalent value in poundals (pdl).
  4. To reverse, multiply the poundal value by 217.3913384332.

Worked examples

Example 1 — Convert 1 gr to pdl:
1 × 0.0045999993 = 0.0045999993 pdl

Example 2 — Convert 100 gr to pdl:
100 × 0.0045999993 = 0.4599999279 pdl

Real-world example — Packaging gauge

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

4 gr × 0.0045999993 = 0.0183999971 pdl

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 poundals aligns the value with the unit most CAD systems and material datasheets prefer.

500 gr × 0.0045999993 = 2.2999996394 pdl

Grain to Poundal conversion table

Standard reference values for converting grains to poundals:

Grain [gr]Poundal [pdl]
0.014.599999e-5
0.10.0004599999
10.0045999993
20.0091999986
30.0137999978
40.0183999971
50.0229999964
100.0459999928
200.0919999856
300.1379999784
400.1839999712
500.2299999639
1000.4599999279
5002.2999996394
10004.5999992788

Frequently asked questions

How many poundals is 1 grain?
1 grain equals 0.0045999993 poundal.
How do I convert grains to poundals?
Multiply the value in grains by 0.0045999993 to get poundals.
How do I convert poundals back to grains?
Multiply the value in poundals by 217.3913384332, or use the Poundal to Grain converter.
How many poundals is 100 grains?
100 grains equals 0.4599999279 poundals, because 100 × 0.0045999993 = 0.4599999279.

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 = 0.0045999993 pdl) verified against the following authoritative sources:

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