Mass and Weight · Unit Converter

Convert Dram (avoirdupois) to Gigagram

Convert drams (avoirdupois) to gigagrams instantly. 1 dram (avoirdupois) = 1.771845e-9 gigagram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Gigagram to Dram (avoirdupois) 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

Dram (avoirdupois)

What is a dram (avoirdupois)?

The avoirdupois dram (dr) equals one-sixteenth of an ounce, about 1.77 grams.

Origin of the dram (avoirdupois)

From Greek 'drachma' through Latin 'dragma'.

Where it is used

Historically pharmacy; today occasional cooking and firearms (powder) use.

When and where it was developed

Defined as 1/256 of the avoirdupois pound.

Metric / SI

Gigagram

What is a gigagram?

A gigagram (Gg) equals 10^6 kilograms, the same as 1,000 metric tons.

Origin of the gigagram

From the SI prefix 'giga-' (from Greek 'gigas', giant).

Where it is used

Bulk commodity, emissions, and freight accounting.

When and where it was developed

The giga- prefix entered the SI in 1960.

Dram (avoirdupois) to Gigagram conversion formula

The relationship between drams (avoirdupois) and gigagrams:

1 dr = 1.771845e-9 Gg
1 Gg = 5.643834e+8 dr

To convert drams (avoirdupois) to gigagrams, multiply the value in drams (avoirdupois) by 1.771845e-9. To reverse, multiply gigagrams by 5.643834e+8.

How to use this converter

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

Step-by-step: convert drams (avoirdupois) to gigagrams

  1. Write down the value in drams (avoirdupois) (dr).
  2. Multiply that value by the factor 1.771845e-9.
  3. The product is the equivalent value in gigagrams (Gg).
  4. To reverse, multiply the gigagram value by 5.643834e+8.

Worked examples

Example 1 — Convert 1 dr to Gg:
1 × 1.771845e-9 = 1.771845e-9 Gg

Example 2 — Convert 100 dr to Gg:
100 × 1.771845e-9 = 1.771845e-7 Gg

Real-world example — Hardware-scale dimensions

A 10-dram (avoirdupois) fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between drams (avoirdupois) and gigagrams daily when mixing metric and imperial tools.

10 dr × 1.771845e-9 = 1.771845e-8 Gg

Real-world example — Postcard and small-object dimensions

A postcard is about 5 drams (avoirdupois) wide. Converting to gigagrams is essential for international postal addressing forms that ask for dimensions in different units across countries.

5 dr × 1.771845e-9 = 8.859226e-9 Gg

Real-world example — Ruler-scale measurements

A 30-dram (avoirdupois) school ruler converts cleanly to gigagrams — useful when buying a desk accessory from a retailer whose product specs use a different unit.

30 dr × 1.771845e-9 = 5.315536e-8 Gg

Dram (avoirdupois) to Gigagram conversion table

Standard reference values for converting drams (avoirdupois) to gigagrams:

Dram (avoirdupois) [dr]Gigagram [Gg]
0.011.771845e-11
0.11.771845e-10
11.771845e-9
23.54369e-9
35.315536e-9
47.087381e-9
58.859226e-9
101.771845e-8
203.54369e-8
305.315536e-8
407.087381e-8
508.859226e-8
1001.771845e-7
5008.859226e-7
10001.771845e-6

Frequently asked questions

How many gigagrams is 1 dram (avoirdupois)?
1 dram (avoirdupois) equals 1.771845e-9 gigagram.
How do I convert drams (avoirdupois) to gigagrams?
Multiply the value in drams (avoirdupois) by 1.771845e-9 to get gigagrams.
How do I convert gigagrams back to drams (avoirdupois)?
Multiply the value in gigagrams by 5.643834e+8, or use the Gigagram to Dram (avoirdupois) converter.
How many gigagrams is 100 drams (avoirdupois)?
100 drams (avoirdupois) equals 1.771845e-7 gigagrams, because 100 × 1.771845e-9 = 1.771845e-7.

Convert Dram (avoirdupois) to other weight units

Show all Dram (avoirdupois) conversions
Metric / SI (18 units)
Dram (avoirdupois) to Attogram (ag) Dram (avoirdupois) to Femtogram (fg) Dram (avoirdupois) to Picogram (pg) Dram (avoirdupois) to Nanogram (ng) Dram (avoirdupois) to Microgram (µg) Dram (avoirdupois) to Milligram (mg) Dram (avoirdupois) to Centigram (cg) Dram (avoirdupois) to Decigram (dg) Dram (avoirdupois) to Gram (g) Dram (avoirdupois) to Dekagram (dag) Dram (avoirdupois) to Hectogram (hg) Dram (avoirdupois) to Kilogram (kg) Dram (avoirdupois) to Quintal (metric) (q) Dram (avoirdupois) to Metric Ton (t) Dram (avoirdupois) to Gigagram (Gg) Dram (avoirdupois) to Teragram (Tg) Dram (avoirdupois) to Petagram (Pg) Dram (avoirdupois) to Exagram (Eg)
Avoirdupois (14 units)
Dram (avoirdupois) to Grain (gr) Dram (avoirdupois) to Ounce (oz) Dram (avoirdupois) to Pound (lb) Dram (avoirdupois) to Clove (clove) Dram (avoirdupois) to Stone (US) (st) Dram (avoirdupois) to Stone (UK) (st) Dram (avoirdupois) to Quarter (US) (qr) Dram (avoirdupois) to Quarter (UK) (qr) Dram (avoirdupois) to Hundredweight (US) (cwt) Dram (avoirdupois) to Hundredweight (UK) (cwt) Dram (avoirdupois) to Wey (wey) Dram (avoirdupois) to Kilopound (kip) (kip) Dram (avoirdupois) to Ton (short, US) (sh tn) Dram (avoirdupois) to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Dram (avoirdupois) to Point (1/100 carat) (pt) Dram (avoirdupois) to Carat (metric) (ct) Dram (avoirdupois) to Scruple (apothecary) (s ap) Dram (avoirdupois) to Pennyweight (dwt) Dram (avoirdupois) to Momme (mom) Dram (avoirdupois) to Mace (mace) Dram (avoirdupois) to Dram (apothecary/troy) (dr ap) Dram (avoirdupois) to Troy Ounce (oz t) Dram (avoirdupois) to Tael (tael) Dram (avoirdupois) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Dram (avoirdupois) to Ratti (ratti) Dram (avoirdupois) to Masha (masha) Dram (avoirdupois) to Tola (tola) Dram (avoirdupois) to Chittack (Chatank) (chittack) Dram (avoirdupois) to Seer (Ser) (seer) Dram (avoirdupois) to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Dram (avoirdupois) to Electron Mass (rest) (me) Dram (avoirdupois) to MeV/c2 (MeV/c²) Dram (avoirdupois) to Muon Mass (mµ) Dram (avoirdupois) to Atomic Mass Unit (u) Dram (avoirdupois) to Proton Mass (mp) Dram (avoirdupois) to Neutron Mass (mn) Dram (avoirdupois) to Deuteron Mass (md) Dram (avoirdupois) to Carbon-12 Atom Mass (C-12) Dram (avoirdupois) to Planck Mass (mP)
Astronomical (4 units)
Dram (avoirdupois) to Lunar Mass (Moon) (M☾) Dram (avoirdupois) to Earth's Mass (M⊕) Dram (avoirdupois) to Jupiter Mass (MJ) Dram (avoirdupois) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Dram (avoirdupois) to Lepton (Biblical Roman) (lepton) Dram (avoirdupois) to Quadrans (Biblical Roman) (quadrans) Dram (avoirdupois) to Assarion (Biblical Roman) (assarion) Dram (avoirdupois) to Gerah (Biblical Hebrew) (gerah) Dram (avoirdupois) to Drachma (Biblical Greek) (drachma) Dram (avoirdupois) to Denarius (Biblical Roman) (denarius) Dram (avoirdupois) to Bekan (Biblical Hebrew) (bekah) Dram (avoirdupois) to Didrachma (Biblical Greek) (didrachma) Dram (avoirdupois) to Shekel (Biblical Hebrew) (shekel) Dram (avoirdupois) to Tetradrachma (Biblical Greek) (tetra) Dram (avoirdupois) to Mina (Biblical Greek) (mina) Dram (avoirdupois) to Mina (Biblical Hebrew) (mina) Dram (avoirdupois) to Talent (Biblical Greek) (talent) Dram (avoirdupois) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Dram (avoirdupois) to Poundal (pdl) Dram (avoirdupois) to Ton (assay) (US) (AT) Dram (avoirdupois) to Ton (assay) (UK) (AT) Dram (avoirdupois) to Kilogram-force square second/meter (hyl) Dram (avoirdupois) to Slug (slug)

Sources & references

Conversion factor (1 dr = 1.771845e-9 Gg) verified against the following authoritative sources:

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