Mass and Weight · Unit Converter

Convert Gram to Pennyweight

Convert grams to pennyweights instantly. 1 gram = 0.6430149479 pennyweight — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pennyweight to Gram 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

Gram

What is a gram?

The gram (g) equals one-thousandth of a kilogram.

Origin of the gram

From Late Latin 'gramma', a small weight or scruple.

Where it is used

The everyday metric unit for food, medicine, and small objects.

When and where it was developed

Defined in 1795 as the mass of one cubic centimeter of water at melting point.

Troy & Apothecary

Pennyweight

What is a pennyweight?

The pennyweight (dwt) equals one-twentieth of a troy ounce, 24 grains (about 1.555 g).

Origin of the pennyweight

From the mass of a medieval English silver penny; symbol dwt from 'denarius weight'.

Where it is used

Jewelry making and precious-metal scrap valuation in the US.

When and where it was developed

Derived from the medieval English coinage system.

Gram to Pennyweight conversion formula

The relationship between grams and pennyweights:

1 g = 0.6430149479 dwt
1 dwt = 1.5551738 g

To convert grams to pennyweights, multiply the value in grams by 0.6430149479. To reverse, multiply pennyweights by 1.5551738.

How to use this converter

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

Step-by-step: convert grams to pennyweights

  1. Write down the value in grams (g).
  2. Multiply that value by the factor 0.6430149479.
  3. The product is the equivalent value in pennyweights (dwt).
  4. To reverse, multiply the pennyweight value by 1.5551738.

Worked examples

Example 1 — Convert 1 g to dwt:
1 × 0.6430149479 = 0.6430149479 dwt

Example 2 — Convert 100 g to dwt:
100 × 0.6430149479 = 64.3014947911 dwt

Real-world example — Postcard and small-object dimensions

A postcard is about 5 grams wide. Converting to pennyweights is essential for international postal addressing forms that ask for dimensions in different units across countries.

5 g × 0.6430149479 = 3.2150747396 dwt

Real-world example — Ruler-scale measurements

A 30-gram school ruler converts cleanly to pennyweights — useful when buying a desk accessory from a retailer whose product specs use a different unit.

30 g × 0.6430149479 = 19.2904484373 dwt

Real-world example — Hardware-scale dimensions

A 10-gram fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between grams and pennyweights daily when mixing metric and imperial tools.

10 g × 0.6430149479 = 6.4301494791 dwt

Gram to Pennyweight conversion table

Standard reference values for converting grams to pennyweights:

Gram [g]Pennyweight [dwt]
0.010.0064301495
0.10.0643014948
10.6430149479
21.2860298958
31.9290448437
42.5720597916
53.2150747396
106.4301494791
2012.8602989582
3019.2904484373
4025.7205979165
5032.1507473956
10064.3014947911
500321.5074739556
1000643.0149479113

Frequently asked questions

How many pennyweights is 1 gram?
1 gram equals 0.6430149479 pennyweight.
How do I convert grams to pennyweights?
Multiply the value in grams by 0.6430149479 to get pennyweights.
How do I convert pennyweights back to grams?
Multiply the value in pennyweights by 1.5551738, or use the Pennyweight to Gram converter.
How many pennyweights is 100 grams?
100 grams equals 64.3014947911 pennyweights, because 100 × 0.6430149479 = 64.3014947911.

Convert Gram to other weight units

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

Sources & references

Conversion factor (1 g = 0.6430149479 dwt) verified against the following authoritative sources:

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