Mass and Weight · Unit Converter

Convert Milligram to Pennyweight

Convert milligrams to pennyweights instantly. 1 milligram = 0.0006430149 pennyweight — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pennyweight to Milligram 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

Milligram

What is a milligram?

A milligram (mg) equals one-millionth of a kilogram, or 0.001 gram.

Origin of the milligram

From the SI prefix 'milli-' (from Latin 'mille', thousand).

Where it is used

Standard for medicine dosing, nutrition labels, and fine jewelry.

When and where it was developed

Part of the original metric system of 1795.

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.

Milligram to Pennyweight conversion formula

The relationship between milligrams and pennyweights:

1 mg = 0.0006430149 dwt
1 dwt = 1555.1738 mg

To convert milligrams to pennyweights, multiply the value in milligrams by 0.0006430149. To reverse, multiply pennyweights by 1555.1738.

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 Milligram converter for the reverse direction.

Step-by-step: convert milligrams to pennyweights

  1. Write down the value in milligrams (mg).
  2. Multiply that value by the factor 0.0006430149.
  3. The product is the equivalent value in pennyweights (dwt).
  4. To reverse, multiply the pennyweight value by 1555.1738.

Worked examples

Example 1 — Convert 1 mg to dwt:
1 × 0.0006430149 = 0.0006430149 dwt

Example 2 — Convert 100 mg to dwt:
100 × 0.0006430149 = 0.0643014948 dwt

Real-world example — Plastic film and laminate thickness

A 500-milligram sheet is a typical spec for ID-card laminates and film overlays. Converting to pennyweights aligns the value with the unit most CAD systems and material datasheets prefer.

500 mg × 0.0006430149 = 0.321507474 dwt

Real-world example — Packaging gauge

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

4 mg × 0.0006430149 = 0.0025720598 dwt

Milligram to Pennyweight conversion table

Standard reference values for converting milligrams to pennyweights:

Milligram [mg]Pennyweight [dwt]
0.016.430149e-6
0.16.430149e-5
10.0006430149
20.0012860299
30.0019290448
40.0025720598
50.0032150747
100.0064301495
200.012860299
300.0192904484
400.0257205979
500.0321507474
1000.0643014948
5000.321507474
10000.6430149479

Frequently asked questions

How many pennyweights is 1 milligram?
1 milligram equals 0.0006430149 pennyweight.
How do I convert milligrams to pennyweights?
Multiply the value in milligrams by 0.0006430149 to get pennyweights.
How do I convert pennyweights back to milligrams?
Multiply the value in pennyweights by 1555.1738, or use the Pennyweight to Milligram converter.
How many pennyweights is 100 milligrams?
100 milligrams equals 0.0643014948 pennyweights, because 100 × 0.0006430149 = 0.0643014948.

Convert Milligram to other weight units

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

Sources & references

Conversion factor (1 mg = 0.0006430149 dwt) verified against the following authoritative sources:

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