Mass and Weight · Unit Converter

Convert Picogram to Dram (apothecary/troy)

Convert picograms to drams (apothecary/troy) instantly. 1 picogram = 2.57206e-13 dram (apothecary/troy) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (apothecary/troy) to Picogram 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

Picogram

What is a picogram?

A picogram (pg) equals 10^-15 kilogram.

Origin of the picogram

From the SI prefix 'pico-' (from Spanish 'pico', a small quantity).

Where it is used

Single-cell biology and ultratrace chemical analysis.

When and where it was developed

The pico- prefix entered the SI in 1960.

Troy & Apothecary

Dram (apothecary/troy)

What is a dram (apothecary/troy)?

The apothecary (troy) dram equals one-eighth of a troy ounce, about 3.888 grams.

Origin of the dram (apothecary/troy)

From the apothecaries' system rooted in the Greek 'drachma'.

Where it is used

Historical pharmacy and medicine compounding.

When and where it was developed

Part of the apothecaries' system of weights used through the 19th century.

Picogram to Dram (apothecary/troy) conversion formula

The relationship between picograms and drams (apothecary/troy):

1 pg = 2.57206e-13 dr ap
1 dr ap = 3.887935e+12 pg

To convert picograms to drams (apothecary/troy), multiply the value in picograms by 2.57206e-13. To reverse, multiply drams (apothecary/troy) by 3.887935e+12.

How to use this converter

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

Step-by-step: convert picograms to drams (apothecary/troy)

  1. Write down the value in picograms (pg).
  2. Multiply that value by the factor 2.57206e-13.
  3. The product is the equivalent value in drams (apothecary/troy) (dr ap).
  4. To reverse, multiply the dram (apothecary/troy) value by 3.887935e+12.

Worked examples

Example 1 — Convert 1 pg to dr ap:
1 × 2.57206e-13 = 2.57206e-13 dr ap

Example 2 — Convert 100 pg to dr ap:
100 × 2.57206e-13 = 2.57206e-11 dr ap

Real-world example — From wavelengths to millimeter-scale objects

A value of one million picograms sounds vast at the atomic scale but converts to a small everyday quantity in drams (apothecary/troy) — useful when relating optical-wavelength specifications to physical mounting hardware.

1000000 pg × 2.57206e-13 = 2.57206e-7 dr ap

Real-world example — Sub-micron to millimeter

500,000 picograms converts to a small everyday quantity in drams (apothecary/troy) — useful when relating optical-wavelength specifications to physical mounting hardware.

500000 pg × 2.57206e-13 = 1.28603e-7 dr ap

Picogram to Dram (apothecary/troy) conversion table

Standard reference values for converting picograms to drams (apothecary/troy):

Picogram [pg]Dram (apothecary/troy) [dr ap]
0.012.57206e-15
0.12.57206e-14
12.57206e-13
25.144119e-13
37.716179e-13
41.028824e-12
51.28603e-12
102.57206e-12
205.144119e-12
307.716179e-12
401.028824e-11
501.28603e-11
1002.57206e-11
5001.28603e-10
10002.57206e-10

Frequently asked questions

How many drams (apothecary/troy) is 1 picogram?
1 picogram equals 2.57206e-13 dram (apothecary/troy).
How do I convert picograms to drams (apothecary/troy)?
Multiply the value in picograms by 2.57206e-13 to get drams (apothecary/troy).
How do I convert drams (apothecary/troy) back to picograms?
Multiply the value in drams (apothecary/troy) by 3.887935e+12, or use the Dram (apothecary/troy) to Picogram converter.
How many drams (apothecary/troy) is 100 picograms?
100 picograms equals 2.57206e-11 drams (apothecary/troy), because 100 × 2.57206e-13 = 2.57206e-11.

Convert Picogram to other weight units

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

Sources & references

Conversion factor (1 pg = 2.57206e-13 dr ap) verified against the following authoritative sources:

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