Mass and Weight · Unit Converter

Convert Dram (avoirdupois) to Teragram

Convert drams (avoirdupois) to teragrams instantly. 1 dram (avoirdupois) = 1.771845e-12 teragram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Teragram 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

Teragram

What is a teragram?

A teragram (Tg) equals 10^9 kilograms, or one million metric tons.

Origin of the teragram

From the SI prefix 'tera-' (from Greek 'teras', monster).

Where it is used

Used in large-scale environmental and industrial mass accounting.

When and where it was developed

The tera- prefix entered the SI in 1960.

Dram (avoirdupois) to Teragram conversion formula

The relationship between drams (avoirdupois) and teragrams:

1 dr = 1.771845e-12 Tg
1 Tg = 5.643834e+11 dr

To convert drams (avoirdupois) to teragrams, multiply the value in drams (avoirdupois) by 1.771845e-12. To reverse, multiply teragrams by 5.643834e+11.

How to use this converter

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

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

  1. Write down the value in drams (avoirdupois) (dr).
  2. Multiply that value by the factor 1.771845e-12.
  3. The product is the equivalent value in teragrams (Tg).
  4. To reverse, multiply the teragram value by 5.643834e+11.

Worked examples

Example 1 — Convert 1 dr to Tg:
1 × 1.771845e-12 = 1.771845e-12 Tg

Example 2 — Convert 100 dr to Tg:
100 × 1.771845e-12 = 1.771845e-10 Tg

Real-world example — Postcard and small-object dimensions

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

5 dr × 1.771845e-12 = 8.859226e-12 Tg

Real-world example — Ruler-scale measurements

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

30 dr × 1.771845e-12 = 5.315536e-11 Tg

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 teragrams daily when mixing metric and imperial tools.

10 dr × 1.771845e-12 = 1.771845e-11 Tg

Dram (avoirdupois) to Teragram conversion table

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

Dram (avoirdupois) [dr]Teragram [Tg]
0.011.771845e-14
0.11.771845e-13
11.771845e-12
23.54369e-12
35.315536e-12
47.087381e-12
58.859226e-12
101.771845e-11
203.54369e-11
305.315536e-11
407.087381e-11
508.859226e-11
1001.771845e-10
5008.859226e-10
10001.771845e-9

Frequently asked questions

How many teragrams is 1 dram (avoirdupois)?
1 dram (avoirdupois) equals 1.771845e-12 teragram.
How do I convert drams (avoirdupois) to teragrams?
Multiply the value in drams (avoirdupois) by 1.771845e-12 to get teragrams.
How do I convert teragrams back to drams (avoirdupois)?
Multiply the value in teragrams by 5.643834e+11, or use the Teragram to Dram (avoirdupois) converter.
How many teragrams is 100 drams (avoirdupois)?
100 drams (avoirdupois) equals 1.771845e-10 teragrams, because 100 × 1.771845e-12 = 1.771845e-10.

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-12 Tg) verified against the following authoritative sources:

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